46 results on '"Zhenming Zhang"'
Search Results
2. Study on Soil Physical Properties in Uncaria Rhynchophylla-Producing Areas under Different Land Use Patterns
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Lichun Wu, Zhenming Zhang, Chao Sun, and Daigang Xu
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Environmental Chemistry ,General Environmental Science - Published
- 2023
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3. Remediation of Soil Contaminated by Heavy Metals Using Biochar: Strategies and Future Prospects
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Qina Chen, Zhenming Zhang, Yi Wang, Guiting Mu, Xianliang Wu, Yingying Liu, Wenmin Luo, and Ximei Wen
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Environmental Chemistry ,General Environmental Science - Published
- 2022
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4. Distribution of Heavy Metal Contents in Soil Producing Uncaria rhynchophylla (Miq.) Miq. ex Havil. In Guizhou: Driven by Land Use Patterns
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Yufeng Gong, Zhenming Zhang, and Xianping Zeng
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Environmental Chemistry ,General Environmental Science - Published
- 2023
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5. Graphene-based photocatalytic nanocomposites used to treat pharmaceutical and personal care product wastewater: A review
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Caifang Li, Xianliang Wu, Jiwei Hu, Junyue Shan, Zhenming Zhang, Xianfei Huang, and Huijuan Liu
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Pharmaceutical Preparations ,Health, Toxicology and Mutagenesis ,Environmental Chemistry ,Environmental Pollutants ,Graphite ,Cosmetics ,General Medicine ,Wastewater ,Pollution ,Nanocomposites - Abstract
Photocatalytic technology has been widely studied by researchers in the field of environmental purification. This technology can not only completely convert organic pollutants into small molecules of CO
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- 2022
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6. Variations in Ecological Stoichiometry Characteristics of C, N and P in Soils Beneath an Abies fanjingshanensis Forest
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Lifu Xu, Zhenming Zhang, Xianliang Wu, and Guiting Mu
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Environmental Chemistry ,General Environmental Science - Published
- 2022
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7. Adsorption and desorption characteristics of metal(oid)s in the yellow soils of a typical karst area, southwest China
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Jiachun Zhang, Zhenming Zhang, Xianfei Huang, Mingyang Cui, Xianliang Wu, and Huijuan Liu
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Health, Toxicology and Mutagenesis ,Soil Science ,Environmental Chemistry ,Pollution - Published
- 2021
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8. Eco Stoichiometric Characteristics of Soil Plant System of Taxus wallichiana under Multi factor Driving
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Jiachun Zhang, Zhenming Zhang, Xianfei Huang, Guiting Mu, and Xianliang Wu
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biology ,Chemistry ,Botany ,Environmental Chemistry ,Taxus wallichiana ,biology.organism_classification ,General Environmental Science - Published
- 2021
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9. Tidal action enhances coastal wetland plant connectivity
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Yanan Wu, Zhenming Zhang, Matthew R. Hipsey, and Mingxiang Zhang
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Environmental Engineering ,Health, Toxicology and Mutagenesis ,Public Health, Environmental and Occupational Health ,Environmental Chemistry ,General Medicine ,General Chemistry ,Pollution - Published
- 2023
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10. Health risk assessment of heavy metals in soils and screening of accumulating plants around the Wanshan mercury mine in Northeast Guizhou Province, China
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Xianfei Huang, Tao Lin, Pinhua Xia, Jiachun Zhang, Zhenming Zhang, Xiangchen Tang, and Xianliang Wu
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Pollution ,China ,Soil test ,Health, Toxicology and Mutagenesis ,media_common.quotation_subject ,chemistry.chemical_element ,010501 environmental sciences ,Risk Assessment ,01 natural sciences ,Soil ,Metals, Heavy ,Humans ,Soil Pollutants ,Environmental Chemistry ,Hyperaccumulator ,Child ,Ecosystem ,0105 earth and related environmental sciences ,media_common ,Rhus chinensis ,biology ,Mercury ,General Medicine ,Vegetation ,biology.organism_classification ,Soil contamination ,Mercury (element) ,chemistry ,Environmental chemistry ,Soil water ,Environmental science ,Environmental Monitoring - Abstract
The Wanshan mercury mine, which is an abandoned mine located in northeastern Guizhou Province in Southwest China, has introduced serious Hg pollution to the local ecosystem resulting from previous mining and smelting activities. However, it is not clear to date whether soil pollution has actually improved after treatment by related departments. Therefore, the present study investigates the vegetation community and heavy metal contents of the soil and plants in the Wanshan mercury mining area. The results showed that most of Hg, Cd, As, Cu, and Zn contents in soil samples were higher than those of Soil Environment Quality Risk Control Standard for Soil Contamination of Agricultural Land in China (GB15618-2018). The observed plant species mainly consisted of Compositae, followed by Leguminosae. Unfortunately, this investigation found that heavy metal concentrations in these plants were not extremely high and far below the standard of hyperaccumulator. Despite all this, the maximum values of bioaccumulation factor for Pb, Cd, Hg, As, Cu and Zn were Serissa japonica (Thunb.) Thunb., Rhus chinensis Mill., Potentilla sibbaldii Haller f., Erigeron canadensis L., Clerodendrum bungei var. bungei. and Rhus chinensis Mill., respectively. Regardless of the carcinogenic or noncarcinogenic risk index, the potential risk to urban children is higher. Our results suggest that heavy metal pollution was indeed relieved since their contents in soil significantly decreased in comparison with those reported in other previous studies. This finding provides a reference for the long-term treatment of heavy metal pollution in the local environment and other areas employing analogous environmental protection measures.
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- 2021
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11. A threshold‐like effect on the interaction between hydrological connectivity and dominant plant population in tidal marsh wetlands
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Lumeng Xie, Mingxiang Zhang, Liyi Dai, Zhenming Zhang, Jiakai Liu, and Ying Liu
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Hydrology ,Biomass (ecology) ,geography ,River delta ,geography.geographical_feature_category ,Soil Science ,Wetland ,Development ,Plant population ,Phragmites ,Hydrology (agriculture) ,Habitat ,Salt marsh ,Environmental Chemistry ,Environmental science ,Species richness ,General Environmental Science - Abstract
Tidal marsh wetlands in the Yellow River Delta provide valuable eco-services to the local population and global ecology. However, this area is suffering from serious degradation under the stresses of social development and climate change. Hydrological connectivity, a new framework in hydrology and ecology, has been proposed as the main factor affecting the ecological processes in coastal wetlands; however, its role in hydrology–soil–vegetation interactions remains unclear. In this study, the researchers parametrically quantified the hydrological connectivity in the tidal marsh wetlands and analyzed its relationship with Phragmites australis, one of the dominant species in this area. Our results showed threshold-like effects on the interaction between hydrological connectivity and P. australis on the plot scale. When biomass is lower than 2.2 kg/m2, the population density and structure size were found to increase with hydrological connectivity. When the biomass is higher than the threshold, the plots disconnected hydrologically because of high water consumption. Compared with soil chemistry, salinity, and water soil content, hydrological connectivity in the surface soil layer is more strongly linked to the plant traits and spatial structure in the tidal marsh wetlands due to the narrow ranges of other variables. Based on the authors’ analysis, the researchers do not recommend dense plantation of P. australis, especially near the freshwater sources in the tidal marsh, because of its high reproduction ability and competitive nature, which may cut the freshwater connectivity off, lowering the richness of plant species and habitat diversity.
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- 2021
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12. Abandoned disposable masks become hot substrates for plastisphere, whether in soil, atmosphere or water
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Jianlong Li, Tianli Zhang, Xiaoling Shan, Wei Zheng, Zhenming Zhang, Zhuozhi Ouyang, Peng Liu, and Xuetao Guo
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Environmental Engineering ,Health, Toxicology and Mutagenesis ,Environmental Chemistry ,Pollution ,Waste Management and Disposal - Published
- 2023
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13. Distribution characteristics of microplastics in soil of Loess Plateau in northwest China and their relationship with land use type
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Mengwei Zhang, Yu Zheng, Junlin Li, Kun Liu, Heng Wang, Hongcheng Gu, Zhenming Zhang, and Xuetao Guo
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Environmental Engineering ,Environmental Chemistry ,Pollution ,Waste Management and Disposal - Published
- 2023
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14. Factors influencing the evolution of human‐driven rocky desertification in karst areas
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Yunchao Zhou, Xianfei Huang, and Zhenming Zhang
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geography ,geography.geographical_feature_category ,Earth science ,Soil Science ,Environmental Chemistry ,Environmental science ,Rocky desertification ,Development ,Karst ,General Environmental Science - Published
- 2020
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15. Coexistence mechanisms of Tamarix chinensis and Suaeda salsa in the Yellow River Delta, China
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Zhenming Zhang, Yu Wang, Ying Liu, Yanan Wu, Lumeng Xie, Liyi Dai, Shiqiang Zhao, and Mingxiang Zhang
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Canopy ,China ,Soil salinity ,Health, Toxicology and Mutagenesis ,Population ,Wetland ,Chenopodiaceae ,010501 environmental sciences ,01 natural sciences ,Soil ,Nutrient ,Rivers ,Environmental Chemistry ,education ,0105 earth and related environmental sciences ,geography ,education.field_of_study ,geography.geographical_feature_category ,River delta ,biology ,Tamaricaceae ,Ecology ,General Medicine ,Interspecific competition ,biology.organism_classification ,Pollution ,Tamarix chinensis - Abstract
To examine how two dominant species coexist within a tidal wetland in the Yellow River Delta, we studied the spatial distribution patterns and ecological relationships of Tamarix chinensis and Suaeda salsa. We also analyzed the relationship between these two plant species and soil chemical properties. Nine quadrats were established, and aerial photography was carried out in July 2018 in the study area to investigate plants and soil. Results showed that T. chinensis showed an aggregation distribution at scales of 0-10 m, 0-30 m, and 0-50 m from the sea to inland. Unlike T. chinensis, S. salsa showed an aggregation distribution at approximately 0-50 m in the study area, which meant the aggregation distributions of T. chinensis and S. salsa were found at different scales and S. salsa tended to aggregate distribution compared with T. chinensis. Meanwhile, T. chinensis and S. salsa had negative correlations far from the sea at a scale of 0-20 m and at the offshore area at a scale of 0-30 m. However, in the intermediate area, S. salsa and T. chinensis showed a positive correlation at a scale of 0-30 m. In general, the relationship between the two groups tends to be negatively correlated in a small range. Given that the tidal action decreased from the sea to inland, the driving factors of population aggregation gradually changed from tidal flooding to an interspecific relationship. The different characteristics of the different species may also have had an effect. And the aggregation of adult plant species had a beneficial impact on the establishment and growth of seedlings and plants. Furthermore, soil properties comprised complex actions including environmental conditions and ecological processes. The soil chemical properties such as soil salinity and nutrients were also influenced by the species' canopy.
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- 2020
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16. Atmospheric Dry Deposition to Natural Water of Wetland in Suburban Beijing
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Ling Cong, Jiexiu Zhai, Yu Wang, Wenmei Ma, Lichun Mo, and Zhenming Zhang
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Hydrology ,geography ,geography.geographical_feature_category ,Beijing ,Natural water ,Environmental Chemistry ,Environmental science ,Wetland ,Natural (archaeology) ,General Environmental Science - Published
- 2020
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17. Microplastic distribution and migration in soil, water and sediments in Caohai Lake under the different hydrological periods, Southwest China
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Xianliang, Wu, Huijuan, Liu, Xuetao, Guo, Zhenming, Zhang, Jiachun, Zhang, and Xianfei, Huang
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Environmental Engineering ,Environmental Chemistry ,Pollution ,Waste Management and Disposal - Abstract
An increasing number of researchers have focused on microplastics (MPs) pollution in inland freshwater lakes due to its ecotoxicity, while little is known about the effects of hydrological periods on MPs distribution. Therefore, this study aims to investigate MPs distribution, morphological characteristics and physicochemical indices in various environments in dry and wet periods in Caohai Lake. The results exhibited that cultivated soil, water, and sediment in Caohai Lake have been polluted by MPs in dry and wet periods. There were pellets, fragments, film, and fibers of MPs in both dry and wet periods, and MP foam was additionally found in the wet period. MPs with 0 to 0.5 mm possessed the largest proportion in the five environments in dry and wet periods, followed by MPs with 0.5 to 1 mm and 1 to 5 mm. In Caohai Lake, the black, white, green, red, and transparent MPs in dry period, and black, colourful, grey, red and transparent MPs in wet period were found. The developed structural equation model confirmed that MPs in sediment were probably mainly from soil. There are negative effects of the relative abundance of MPs from cultivated soil to lake water in the dry period, whereas the opposite is true in the wet period. Interestingly, the complex and fast water velocity in the estuary in the wet period led to a lower relative abundance of MPs in its sediment in comparison with the dry period. The distribution model of MPs in estuary and lake water in dry and wet periods is not inconsistent. Our results suggest that the related government department should take measures to reduce the MPs pollution in Caohai Lake, especially from the source.
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- 2023
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18. A systematic review of microplastics in the environment: Sampling, separation, characterization and coexistence mechanisms with pollutants
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Zhenming, Zhang, Xianliang, Wu, Huijuan, Liu, Xianfei, Huang, Qina, Chen, Xuetao, Guo, and Jiachun, Zhang
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Environmental Engineering ,Environmental Chemistry ,Pollution ,Waste Management and Disposal - Abstract
Microplastics (5 mm) (MPs) are widely distributed throughout the world, and their accumulation and migration in the environment have caused health and safety concerns. Currently, most of the reviewed literatures mainly focus on the distribution in various environmental media, adsorption mechanisms with different pollutants, and characterization of MPs. Therefore, the present review mainly highlights the characterization techniques of MPs and the underlying mechanisms of their combination with conventional coexisting substances (heavy metals, organic pollutants, and nutrients). We observed that massive MP pollution has been found in many areas, especially in Africa, Asia, India, South Africa, North America and Europe. The separation methods of MPs in different environmental media are basically similar, including sampling, pre-treatment, flotation, filtration and digestion. The combination of multiple characterization technologies can more precisely identify the shape, abundance, colour, and particle size of MPs. Notably, although recent reports have confirmed that MPs can act as carriers of heavy metals and carry them into organisms to cause harm, MPs have different adsorption and desorption characteristics for various heavy metals. The adsorption capacity of organic pollutants onto MPs is closely related to their hydrophobicity, specific surface area and functional group characteristics. The relative abundance of MPs in sediments and lakes had a significantly positive correlation with the mass concentration of total nitrogen in lake water, but this finding still needs to be further verified. Based on current research, we suggest that future MP research should focus on characterization technology, environmental migration, ecological effects, health risks and degradation methods.
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- 2023
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19. Seasonal Variations and Chemical Characteristics of PM2.5 Aerosol in the Urban Green Belt of Beijing, China
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Ling Cong, Zhenming Zhang, Guoxin Yan, Yu Wang, Yanan Wu, Hui Zhang, and Jiexiu Zhai
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Beijing ,Environmental chemistry ,Water soluble ions ,Environmental Chemistry ,Environmental science ,China ,General Environmental Science ,Aerosol - Published
- 2019
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20. Driving Factors and Prediction of Rock Desertification of Non-Tillage Lands in a Karst Basin, Southwest China
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Xingfu Wang, Zhou Xinwei, Jiachun Zhang, Zhenming Zhang, Xianfei Huang, and Yunchao Zhou
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Tillage ,Driving factors ,Hydrology ,geography ,geography.geographical_feature_category ,Outcrop ,Environmental Chemistry ,Rocky desertification ,Structural basin ,Karst ,China ,Geology ,General Environmental Science - Published
- 2021
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21. Speciation Variation and Bio-Activation of Soil Heavy Metals (Cd and Cr) in Rice-Rape Rotation Lands in Karst Regions
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Jiachun Zhang, Hui Fang, Xianfei Huang, Guiting Mu, and Zhenming Zhang
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China ,010504 meteorology & atmospheric sciences ,Correlation coefficient ,Rotation ,Health, Toxicology and Mutagenesis ,media_common.quotation_subject ,lcsh:Medicine ,Karst ,Fraction (chemistry) ,010501 environmental sciences ,01 natural sciences ,Article ,Metal ,chemistry.chemical_compound ,Soil ,Soil pH ,Metals, Heavy ,Soil Pollutants ,speciation change ,0105 earth and related environmental sciences ,media_common ,geography ,geography.geographical_feature_category ,Chemistry ,rice-rape rotation ,lcsh:R ,Public Health, Environmental and Occupational Health ,Oryza ,soil heavy metals ,Speciation ,bioactivity ,Environmental chemistry ,visual_art ,visual_art.visual_art_medium ,Carbonate ,Composition (visual arts) ,Cadmium ,Environmental Monitoring - Abstract
Heavy metals in soil are in a high background state in Karst areas, and agricultural activities will affect the bioactivity of heavy metals. The heavy metal (Cd and Cr) bioactivity and their activation effects in rice-rape rotation lands in Karst areas were studied based on field experiments and laboratory analysis, and the influencing factors of heavy metal activity were analyzed based on the physical and chemical properties of soil. The results suggest that the residual fraction was the largest and the exchangeable fraction was the smallest for both Cr and Cd in rice-rape rotation lands in Karst areas. During the rice-rape rotation process, Cd and Cr tended to be released from the residual fraction and transformed into the other four fractions. The fractions with high bioactivity, including the exchangeable fraction and carbonate fraction, increased to different degrees. Rice-rape rotation could activate the activity of soil Cd and Cr in Karst areas. It is also revealed that the activity of soil Cd and Cr in Karst areas was closely associated with soil pH and electric potential (Eh). In the 0–20 cm soil layer, Cr showed a significant negative correlation with pH (r = −0.69, p <, 0.05), while both Cr and Cd showed significant negative correlations with Eh, and the correlation coefficients were −0.85 (p <, 0.01) and −0.83 (p <, 0.01), respectively. In the 20–40 cm soil layer, Cr showed significant negative correlations with Eh, and the correlation coefficient was −0.95 (p <, 0.01). No significant correlation between the activity of soil Cd and Cr and soil mechanical composition was observed. This study revealed that special attention should be paid to changes in pH and Eh in consideration of heavy metal activity in the rice-rape rotation process.
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- 2020
22. Temporal and spatial changes of Pb in soils in Cuihu wetland, Beijing, China
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Jiexiu Zhai, Yanan Wu, Zhenming Zhang, Guoxin Yan, Liyi Dai, and Ling Cong
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China ,Pb pollution ,0208 environmental biotechnology ,Lead pollution ,Pb contamination ,Wetland ,02 engineering and technology ,010501 environmental sciences ,01 natural sciences ,Soil ,Beijing ,Environmental protection ,medicine ,Environmental Chemistry ,Soil Pollutants ,Waste Management and Disposal ,0105 earth and related environmental sciences ,Water Science and Technology ,geography ,geography.geographical_feature_category ,General Medicine ,Seasonality ,medicine.disease ,020801 environmental engineering ,Lead ,Wetlands ,Soil water ,Environmental science ,Environmental Monitoring - Abstract
Protecting soil from Pb contamination has been a programme for a long time in China. However, research on lead pollution in wetlands remains rare. To understand the characteristics of Pb pollution in Beijing and the sources of contamination of different soil samples in wetlands, we collected samples during all four seasons from two soil horizons and analyzed their Pb concentrations and Pb isotope ratios. The average concentrations of Pb varied from 65.44 mg/kg in spring to 106.11 mg/kg in winter. Concentrations in autumn were significantly lower than those in spring and summer and were notably different between A and B Horizons (59.42 and 71.47 mg/kg, respectively). The Pb isotopic compositions show that Pb pollution results from a mixing of geogenic and anthropogenic materials. The ratios of
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- 2020
23. Adsorption of Heavy Metals on Soil Collected from Lixisol of Typical Karst Areas in the Presence of CaCO3 and Soil Clay and Their Competition Behavior
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Zhenming Zhang, Jiachun Zhang, Xianliang Wu, Mingyang Cui, Guandi He, and Xianfei Huang
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CaCO3 ,Geography, Planning and Development ,Guizhou Province ,TJ807-830 ,02 engineering and technology ,010501 environmental sciences ,Management, Monitoring, Policy and Law ,engineering.material ,TD194-195 ,01 natural sciences ,Renewable energy sources ,chemistry.chemical_compound ,Adsorption ,Lixisol ,Desorption ,Soil pH ,GE1-350 ,heavy metals ,0105 earth and related environmental sciences ,Lime ,Topsoil ,pseudo-second-order kinetic ,Environmental effects of industries and plants ,Renewable Energy, Sustainability and the Environment ,clay ,021001 nanoscience & nanotechnology ,Environmental sciences ,Calcium carbonate ,Freundlich model ,chemistry ,Environmental chemistry ,Soil water ,engineering ,0210 nano-technology - Abstract
The content of heavy metals in the soil in Guizhou Province, which is a high-risk area for heavy metal exposure, is significantly higher than that in other areas in China. Therefore, the objective of this study was to evaluate the ability of CaCO3 and clay to accumulate heavy metals in topsoil sample collected from Lixisol using the method of indoor simulation. The results showed that the contents of Cu, Zn, Cd, Cr, Pb, Hg and As in the soil sample were 10.8 mg/kg, 125 mg/kg, 0.489 mg/kg, 23.5 mg/kg, 22.7 mg/kg, 58.3 mg/kg and 45.4 mg/kg, respectively. The soil pH values increased with the CaCO3 concentration in the soil, and the fluctuation of the soil pH values was weak after the CaCO3 concentrations reached 100 g/kg. The adsorption capacity of lime soil increased by approximately 10 mg/kg on average, and the desorption capacity decreased by approximately 300 mg/kg on average. The desorption of all heavy metals in this study did not change with increasing clay content. Pseudo-second-order kinetics were more suitable for describing the adsorption kinetics of heavy metals on the soil material, as evidenced by the higher R2 value. The Freundlich model can better describe the adsorption process of As on lime soil. The process of As, Cr, Cd and Hg adsorption on the soil sample was spontaneous and entropy-driven. Additionally, the process of Cu and Pb adsorption on the soil materials was spontaneous and enthalpy-driven. Generally, the adsorption and desorption of heavy metals in polluted soil increased and decreased, respectively, with increasing CaCO3 content. The effect of calcium carbonate on the accumulation of heavy metals in soil was greater than that of clay. In summary, CaCO3 and pH values in soil can be appropriately added in several areas polluted by heavy metals to enhance the crop yield and reduce the adsorption of heavy metals in soils.
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- 2020
24. Tides affect plant connectivity in coastal wetlands on a small-patch scale
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Lumeng Xie, Ying Liu, Zhenming Zhang, Liyi Dai, Shiqiang Zhao, Mingxiang Zhang, and Yanan Wu
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China ,Salinity ,Environmental Engineering ,Soil salinity ,Nitrogen ,Health, Toxicology and Mutagenesis ,0208 environmental biotechnology ,Intertidal zone ,Wetland ,02 engineering and technology ,010501 environmental sciences ,Chenopodiaceae ,01 natural sciences ,Supralittoral zone ,Soil ,Rivers ,Environmental Chemistry ,0105 earth and related environmental sciences ,Hydrology ,geography ,geography.geographical_feature_category ,biology ,Tamaricaceae ,Public Health, Environmental and Occupational Health ,Phosphorus ,General Medicine ,General Chemistry ,Vegetation ,Tidal Waves ,biology.organism_classification ,Pollution ,020801 environmental engineering ,Wetlands ,Soil water ,Environmental science ,Tamarix chinensis ,Bank - Abstract
Coastal wetlands are ecologically and economically important; however, they are currently faced with fragmentation and loss. Plants are a fundamental element of wetlands and previous researches have focused on wetland plant connectivity; however, these researches have been conducted at the landscape but not species level. Here, given that tidal flats are important areas in coastal wetlands, we investigated the connectivity characteristics of typical plant species and environmental factors in different wetland regions influenced by various tidal conditions to reveal vegetation connectivity and its relationship with environmental factors on a small-patch scale. We found that tides negatively affect plant connectivity because both the Tamarix chinensis and Suaeda salsa have the highest connectivity on river banks, which are not influenced by tides. Of two tidal regions, different tides conditions have different influence on two plant species. T. chinensis had higher connectivity in the supratidal zone, whereas S. salsa had higher connectivity in the intertidal zone. Besides, the soil water content and soil salinity were significantly different in the three regions, but the soil total nitrogen and phosphorous were not. Soil water content and soil salinity were two factors that significantly affected plant connectivity. Specifically, soil water content positively affected the connectivity of T. chinensis and S. salsa, whereas soil salinity negatively affected the connectivity of T. chinensis. Taken together, these results indicate that tidal conditions affect plant connectivity on a small-patch scale. River banks and supratidal zone are beneficial for the recovery and growth of T. chinensis, intertidal zone and river banks are more conducive to the recovery and growth of S. salsa. Based on the above research, this study provides insights that could be applied to vegetation restoration in coastal wetlands.
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- 2020
25. Dry Deposition of Particulate Matter and Ions in Forest at Different Heights
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Ling Cong, Yu Wang, Wenmei Ma, Jiexiu Zhai, Zhenming Zhang, Yanan Wu, Guoxin Yan, and Jiakai Liu
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Canopy ,Tree canopy ,Understory ,010501 environmental sciences ,Particulates ,01 natural sciences ,chemistry.chemical_compound ,Deposition (aerosol physics) ,Nitrate ,chemistry ,Environmental chemistry ,Environmental science ,Relative humidity ,Sulfate ,0105 earth and related environmental sciences ,General Environmental Science - Abstract
Dry deposition of particulate matter (PM) indicates the capacity of atmosphere self-depuration. To investigate seasonal dry deposition of PM in an urban forest, the concentration and ionic composition of PM2.5 (particulate matter with aerodynamic equivalent diameters less than 2.5 μm) and the deposition of PM and ions in PM at different layer were measured at three canopy heights in the Beijing Olympic Forest Park. Results showed that diurnal trends in PM concentration varied with height and that concentrations tended to be highest in the understory. During winter, when the absorption ability of plants, which withered, was reduced, and anthropogenic emissions, primarily from coal combustion, ion concentrations tended to be highest in the forest canopy. The anions SO42−, NO3−, and Cl− were the dominant ionic species, accounting for 82% of the total mass of water-soluble ions in PM2.5. Results showed a lower mass ratio of NO3−/SO42− (mean = 0.29, SD = 0.24), relative to previous studies, implying that vehicle emissions may have reduced in Beijing. The chemical forms of sulfate and nitrate were likely NH4NO3 and (NH4)2SO4; however, Ca(NO3)2 was the only chemical form detected based on the correlation coefficient between Ca2+ and NO3−. Concentrations of PM were negatively related to temperature and wind speed, and positively related to relative humidity. Within the forest canopy, the deposition velocity was low (high) during summer (winter). Furthermore, ion deposition fluxes were higher in the forest understory (1.5–6 m) during summer and in the canopy (6–10 m) during winter. This was attributed to seasonal trends in PM concentration.
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- 2018
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26. Assessing the spatiotemporal characteristics of dry deposition flux in forests and wetlands
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Jiexiu Zhai, Lichun Mo, Zhenming Zhang, Jiakai Liu, Yu Wang, Wenmei Ma, Ling Cong, Guoxin Yan, and Yanan Wu
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China ,0208 environmental biotechnology ,Flux ,Wetland ,02 engineering and technology ,Forests ,010501 environmental sciences ,01 natural sciences ,Humans ,Environmental Chemistry ,Ecosystem ,Cities ,Waste Management and Disposal ,0105 earth and related environmental sciences ,Water Science and Technology ,Hydrology ,Air Pollutants ,geography ,geography.geographical_feature_category ,food and beverages ,General Medicine ,Particulates ,020801 environmental engineering ,Beijing ,Wetlands ,Environmental science ,Particulate Matter ,Seasons ,Environmental Monitoring - Abstract
Forests and wetlands, as two important ecosystems, play a crucial role in reducing the concentration of particulate matters. The main purpose of this study is to reveal the contribution of forest and wetland ecosystems to the reduction of particulate matter. We collected the concentration and meteorological data during the daytime in a forest and a wetland in the Olympic Park in Beijing. The main results are as follows: daily variation in the PM
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- 2018
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27. Wetlands with greater degree of urbanization improve PM2.5 removal efficiency
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Yanan Wu, Mingxiang Zhang, Yu Wang, Zhenming Zhang, Guoxin Yan, and Jiakai Liu
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Environmental Engineering ,010504 meteorology & atmospheric sciences ,Health, Toxicology and Mutagenesis ,Air pollution ,Wetland ,010501 environmental sciences ,medicine.disease_cause ,01 natural sciences ,Degree (temperature) ,Air Pollution ,Urbanization ,medicine ,Environmental Chemistry ,0105 earth and related environmental sciences ,geography ,geography.geographical_feature_category ,Public Health, Environmental and Occupational Health ,Environmental engineering ,General Medicine ,General Chemistry ,Pollution ,Urban expansion ,Deposition (aerosol physics) ,Wetlands ,Plant species ,Environmental science - Abstract
In recent decades, China has experienced both rapid urbanization and heavy air pollution and the rapid urbanization trend would be continue in the next decade. Wetlands have been shown to be efficient in particle removal, primarily through dry deposition and leaf accumulation. Thus, a more comprehensive understanding of PM2.5 removal by wetlands during urbanization processes could inform urban planning. In the current study, three wetland plots, Cuihu Lake Park (CL), Summer Palace (SP), and Olympic Park (OP), were selected as low, medium, and highly degrees of urbanization site respectively based on the proportions of building and traffic district areas to compare the removal efficiencies. Results show the average dry deposition velocity in OP was significantly higher than CL and SP. Dry deposition is mainly influenced by meteorological conditions. Buildings and other infrastructure make the meteorological conditions conducive to deposition, resulting in higher wind velocity, higher temperature, and more intense turbulence between buildings. Variation in leaf accumulation was not statistically significant between the three plots, and plant species was the major factor affecting the amount of accumulation. The dry deposition contribution to particle removal increases with degree of urbanization. The average dry deposition accounted for 39.74%, 52.55%, and 62.75% at low, middle and high level respectively. Therefore, Wetlands with greater degree of urbanization improve PM2.5 removal efficiency primarily by accelerating the dry deposition process. The result emphasizes the importance of wetlands in particle removal in highly urbanized areas and thus more wetlands should be preserved and/or created during urban expansion.
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- 2018
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28. Comparing Estimation Methods for Soil Organic Carbon Storage in Small Karst Watersheds
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Yunchao Zhou, Zhenming Zhang, Shijie Wang, and Xianfei Huang
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geography ,geography.geographical_feature_category ,Soil science ,04 agricultural and veterinary sciences ,Soil carbon ,010501 environmental sciences ,Karst ,01 natural sciences ,040103 agronomy & agriculture ,0401 agriculture, forestry, and fisheries ,Environmental Chemistry ,Environmental science ,Estimation methods ,0105 earth and related environmental sciences ,General Environmental Science - Published
- 2018
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29. Effect of straw decomposition on organic carbon fractions and aggregate stability in salt marshes
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Rong Xiao, Mingxiang Zhang, Zhenming Zhang, Chen Wang, and Yueyan Pan
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Total organic carbon ,geography ,Environmental Engineering ,Aggregate (composite) ,geography.geographical_feature_category ,010504 meteorology & atmospheric sciences ,Chemistry ,Fine particulate ,food and beverages ,Soil carbon ,010501 environmental sciences ,Straw ,01 natural sciences ,Pollution ,Decomposition ,Phragmites ,Environmental chemistry ,Salt marsh ,Environmental Chemistry ,Waste Management and Disposal ,0105 earth and related environmental sciences - Abstract
Straw addition can increase the content of soil organic carbon (SOC), and affect the content of aggregates and organic carbon fractions. The changes in aggregates and organic carbon fractions in the natural salt marsh, 10-year and 15-year freshwater pumping areas in the Yellow River Estuary were studied by 120-day field in situ culture experiments with Phragmites australis straw addition. The results showed that straw addition mainly enhanced the soil aggregate stability in the 10-year freshwater pumping area, and the organic carbon content of small macro-aggregates increased significantly by 26.36% (P
- Published
- 2021
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30. Soil Organic Carbon Density Spatial Distribution and Influencing Factors in a Karst Mountainous Basin
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Yunchao Zhou, Shijie Wang, Zhenming Zhang, and Xianfei Huang
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Hydrology ,Total organic carbon ,geography ,geography.geographical_feature_category ,Soil organic matter ,Soil chemistry ,Soil classification ,Soil science ,04 agricultural and veterinary sciences ,Soil carbon ,010501 environmental sciences ,Spatial distribution ,Karst ,01 natural sciences ,Spatial heterogeneity ,040103 agronomy & agriculture ,0401 agriculture, forestry, and fisheries ,Environmental Chemistry ,Environmental science ,0105 earth and related environmental sciences ,General Environmental Science - Published
- 2017
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31. Speciation and accumulation pattern of heavy metals from soil to rice at different growth stages in farmland of southwestern China
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Zhenming Zhang, Jiachun Zhang, Hui Fang, Xianliang Wu, Qiusheng Wu, and Xianfei Huang
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Adult ,China ,Farms ,Health, Toxicology and Mutagenesis ,media_common.quotation_subject ,Bioconcentration ,010501 environmental sciences ,01 natural sciences ,Husk ,Risk Assessment ,Toxicology ,Soil ,Metals, Heavy ,Environmental Chemistry ,Ecotoxicology ,Humans ,Soil Pollutants ,Child ,0105 earth and related environmental sciences ,media_common ,Rhizosphere ,food and beverages ,Oryza ,General Medicine ,Straw ,Contamination ,Pollution ,Hazard quotient ,Speciation ,Environmental science ,Environmental Monitoring - Abstract
Paddy rice, one of the most important food crops in Southeast Asia, is considered a main source of human exposure to heavy metal contamination because it efficiently accumulates heavy metals. In the present study, of Japonica rice grains, straw, roots, leaves, and husks and rhizosphere paddy soils (0–20 cm and 20–40 cm depth) were collected from Zunyi in northern Guizhou Province, China. The forms of heavy metals, including Cr, Cd, Pb, Cu, and Zn, in the two soil profiles were investigated using Tessier’s five-stage sequential extraction procedure. There was no heavy metal pollution in the study area based on the evaluation of the geo-accumulation index and the potential ecological risk index. Accumulation varied from one area to another, and the highest metal accumulation was found in the order of root > stems > leaves. The bioaccumulation factor (BCF) results revealed that during the grain-filling stage, the rice had high BCF values (> 1) for Cd and Zn. The target hazard quotient (THQ) of ingestion peaked for Cd and reached its minimum level for Zn in not only in adults but also in children. The THQ was ranked as Cd > Cu > Pb > Cr > Zn for both adults and children. The hazard index values for adults and children for the five heavy metals were 1.81 × 10−3 and 1.55 × 10−3, respectively, indicating that these metals have little effect on the human body. The lifetime carcinogenic risk values for local adults and children were 4.28 × 10−5 and 5.92 × 10−5, respectively, both of which were within the tolerable to acceptable risk range. In summary, obvious hazards for local adults and children were not observed in this study. Considering the total amount and chemical forms of Cd, it is necessary to notify the appropriate departments about the possible rice contamination caused by Cd in the soil.
- Published
- 2019
32. Lead isotope trends and sources in the atmosphere at the artificial wetland
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Zhenming Zhang, Jiexiu Zhai, Mingxiang Zhang, Yu Wang, Yanan Wu, Ling Cong, Guoxin Yan, and Jiakai Liu
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Environmental Impacts ,Pollution ,010504 meteorology & atmospheric sciences ,media_common.quotation_subject ,lcsh:Medicine ,Wetland ,Ecosystem Science ,010501 environmental sciences ,01 natural sciences ,General Biochemistry, Genetics and Molecular Biology ,Atmosphere ,Total suspended particulate matter ,Spring (hydrology) ,Lead isotope ratio ,Lead concentration ,0105 earth and related environmental sciences ,media_common ,geography ,geography.geographical_feature_category ,Isotope ,General Neuroscience ,Lead (sea ice) ,lcsh:R ,General Medicine ,Particulates ,Atmospheric Chemistry ,Environmental chemistry ,Environmental science ,General Agricultural and Biological Sciences ,Enrichment factor ,EF values ,Environmental Contamination and Remediation ,Artificial wetland - Abstract
With the rapid development of industry, studies on lead pollution in total suspended particulate matter (TSP) have received extensive attention. This paper analyzed the concentration and pollution sources of lead in the Cuihu Wetland in Beijing during the period of 2016–2017. The results show that the lead contents in TSP in the Cuihu Wetland were approximately equal in summer and spring, greater in winter, and greatest in autumn. The corresponding lead concentrations were 0.052, 0.053, 0.101, and 0.115 ng/m3, respectively. We compared the 206Pb/207Pb data with other materials to further understand the potential sources of atmospheric lead. The mean values of 206Pb/207Pb from spring to winter were 1.082, 1.098, 1.092, and 1.078, respectively. We found that the lead sources may be associated with coal burning, brake and tire wear, and vehicle exhaust emissions. We also calculated the enrichment factor values for the four seasons, and the values were all much greater than 10, indicating that the lead pollution is closely related to human activities.
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- 2019
33. Occurrence mechanism and prediction of rocky land degradation in karst mountainous basins with the aid of GIS technology, a study case in Houzhai River Basin in southwestern China
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Zhenming Zhang, Yunchao Zhou, Shijie Wang, and Xianfei Huang
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Global and Planetary Change ,geography ,geography.geographical_feature_category ,Disturbance (geology) ,Outcrop ,0208 environmental biotechnology ,Drainage basin ,Soil Science ,Geology ,02 engineering and technology ,010501 environmental sciences ,Structural basin ,Karst ,01 natural sciences ,Pollution ,020801 environmental engineering ,Altitude ,Land degradation ,Environmental Chemistry ,Physical geography ,China ,0105 earth and related environmental sciences ,Earth-Surface Processes ,Water Science and Technology - Abstract
Rocky desertification is a severe ecological issue threatening and constraining regional sustainable development in karst mountainous areas like Houzhai River Basin in southwestern China. The results indicate that slope gradient and altitude are closely associated with occurrence of rocky desertification in the study region and there are some significant correlations between rock outcrop and slope gradient (r = 0.363, p
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- 2019
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34. Water quantity and quality changes from forested riparian buffer in Beijing
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Zhenming Zhang, Kang Xu, Mingxiang Zhang, and Lichun Mo
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Canopy ,Riparian buffer ,Nitrogen ,Health, Toxicology and Mutagenesis ,ved/biology.organism_classification_rank.species ,chemistry.chemical_element ,010501 environmental sciences ,Forests ,01 natural sciences ,Shrub ,Trees ,Nutrient ,Environmental Chemistry ,Ecosystem ,0105 earth and related environmental sciences ,geography ,geography.geographical_feature_category ,ved/biology ,Phosphorus ,Water Pollution ,Water ,General Medicine ,Pinus ,Pollution ,chemistry ,Agronomy ,Beijing ,Litter ,Environmental science ,Terrestrial ecosystem ,Interception ,Environmental Monitoring - Abstract
As a transitional zone between aquatic and terrestrial ecosystems, the riparian buffer is an important control measure for non-point source pollution. The research presented here mainly discussed the interception efficiencies of different vegetation types for nitrogen and phosphorus pollution. The results showed that canopy, shrub, and grass interceptions basically accounted for about 80.0% of total interception, and therefore riparian buffer configurations should clearly distinguish three levels of vegetation types. (1) Canopy, shrub, grass, and litter interceptions of Pinus tabuliformis (YS) were the highest, up to about 71.1%. (2) Platycladus orientalis (CB) had the highest transportation and enrichment for the elements nitrogen (N) and phosphorus (P) throughout the process, which the value of TP decreased from 0.2 to 0.12 mg/L and the value of TN decreased from 5.0 to 2.5 mg/L. (3) The transportation of total phosphorus (TP) of the three tree species was higher than the transportation of total nitrogen (TN), showing that the enrichment of P was stronger than that of N. Thus, Pinus tabuliformis is the best configuration for rainfall interception, while Platycladus orientalis is the best configuration for N and P removals. Different forest configurations should also be considered to build a riparian buffer to remove nutrient in the future.
- Published
- 2019
35. Influence of fungi and bag mesh size on litter decomposition and water quality
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Guoxin Yan, Zhenming Zhang, Ling Cong, Mingxiang Zhang, Jiakai Liu, Yu Wang, Yanan Wu, and Jiexiu Zhai
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China ,Nitrogen ,Health, Toxicology and Mutagenesis ,010501 environmental sciences ,01 natural sciences ,Animal science ,Nutrient ,Water Quality ,Environmental Chemistry ,Ecotoxicology ,Particle Size ,Ecosystem ,Soil Microbiology ,0105 earth and related environmental sciences ,Salix matsudana ,biology ,Chemistry ,Chemical oxygen demand ,Fungi ,Phosphorus ,Salix ,General Medicine ,Plant litter ,biology.organism_classification ,Pollution ,Decomposition ,Plant Leaves ,Biodegradation, Environmental ,Populus ,Wetlands ,Litter ,Water quality ,Glass - Abstract
Litter decomposition is a complex process that is influenced by many different physical, chemical, and biological processes. Environmental variables and leaf litter quality (e.g., nutrient content) are important factors that play a significant role in regulating litter decomposition. In this study, the effects of adding fungi and using different mesh size litter bags on litter (Populus tomentosa Carr. and Salix matsudana Koidz.) decomposition rates and water quality were investigated, and investigate the combination of these factors influences leaf litter decomposition. Dissolved oxygen (DO), chemical oxygen demand (COD), total phosphorus (TP), and ammonia-nitrogen (NH3-N) were measured during the 112-day experiment. The salix leaf litter (k = 0.045) displayed faster decomposition rates than those of populous leaf litter (k = 0.026). Litter decomposition was initially slow and then accelerated; and by the end of the experiment, the decomposition rate was significantly higher (p = 0.012, p
- Published
- 2019
36. Hydrological connectivity improves soil nutrients and root architecture at the soil profile scale in a wetland ecosystem
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Zhenming Zhang, Lumeng Xie, Ying Liu, Yanan Wu, Liyi Dai, Shiqiang Zhao, and Yinghu Zhang
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China ,Environmental Engineering ,010504 meteorology & atmospheric sciences ,Wetland ,010501 environmental sciences ,01 natural sciences ,Soil ,Environmental Chemistry ,Ecosystem ,Water cycle ,Waste Management and Disposal ,0105 earth and related environmental sciences ,Hydrology ,geography ,geography.geographical_feature_category ,River delta ,biology ,Soil organic matter ,Nutrients ,Soil carbon ,biology.organism_classification ,Pollution ,Carbon ,Wetlands ,Environmental science ,Soil horizon ,Tamarix chinensis - Abstract
Hydrological connectivity is an essential driver of the stability, structure, and function of wetland ecosystems. Small-scale hydrological connectivity restricts large-scale hydrological cycle processes. This study aimed to investigate the response of soil and root properties to hydrological connectivity at the soil profile scale. Tamarix chinensis, which is a typical plant of the Yellow River Delta wetland, was sampled for analysis. We investigated soil and root properties in the three study plots where T. chinensis distributed and compared them at different soil depths and under different hydrological connectivity conditions. We found that the soil organic carbon (SOC), soil organic matter (SOM), and soil total nitrogen (STN) were significantly higher in shallow soil (0–10 cm deep), and that root architecture parameters such as root length and width at soil depth of 0–10 cm were also significantly higher than at other soil depths. Both the soil nutrients and root architecture parameters were significantly influenced by hydrological connectivity. Specifically, SOC, SOM, and STN were significantly higher in regions of high hydrological connectivity than in regions of low hydrological connectivity. Additionally, root length, root surface area, root projected area, and root volume were markedly higher in regions of high hydrological connectivity. Furthermore, root length and width had significant positive correlations with both SOC and SOM in regions of high hydrological connectivity. Taken together, these results indicate that higher hydrological connectivity promotes soil nutrients and root architecture at the soil profile scale. In the process of wetland protection and restoration, we should not only pay attention to hydrological connectivity at a watershed scale, but also to improving hydrological connectivity at smaller scales so as to restore soil nutrients and promote plant growth.
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- 2021
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37. Relationships between soil properties and the accumulation of heavy metals in different Brassica campestris L. growth stages in a Karst mountainous area
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Chenglong Tu, Hui Fang, Xianfei Huang, Zhenming Zhang, Jiachun Zhang, Changhu Lin, Honghao Huo, and Xianliang Wu
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China ,Farms ,Health, Toxicology and Mutagenesis ,media_common.quotation_subject ,0211 other engineering and technologies ,Brassica ,02 engineering and technology ,010501 environmental sciences ,Risk Assessment ,01 natural sciences ,Metal ,Soil ,Metals, Heavy ,Soil pH ,Soil Pollutants ,Organic matter ,0105 earth and related environmental sciences ,media_common ,chemistry.chemical_classification ,021110 strategic, defence & security studies ,Rhizosphere ,biology ,Extraction (chemistry) ,Public Health, Environmental and Occupational Health ,Agriculture ,Bayes Theorem ,General Medicine ,biology.organism_classification ,Pollution ,Soil contamination ,Speciation ,chemistry ,visual_art ,Environmental chemistry ,visual_art.visual_art_medium ,Environmental science ,Environmental Pollution ,Environmental Monitoring - Abstract
The speciation and activity of heavy metals in farmland were changed with the different soil properties and flooded environment, especially in the complex and rainy environment in soil of Guizhou Province. The objective of this study was to explore the concentrations of a variety of heavy metal activity and the speciation of those heavy metals in rhizosphere soil at different growth stages of Brassica campestris L. in a Karst mountainous area. Tessier's five-stage sequential extraction procedure, the potential ecological risk index, a Bayesian network, accumulation factors, translocation factors and a laboratory simulation experiment were applied in this study. The results showed that (1) no heavy metal concentrations (except the Cd concentration) exceeded the limits of the soil environmental quality risk control standards for soil contamination of agricultural land in China (GB15618-2018). (2) The orders of the accumulation factor and translocation factor values were Zn > Cd > Cu > Pb > Cr and Cd > Cu > Zn > Pb > Cr, respectively. The order of the heavy metal contents of different tissues during the whole growth period was roots > leaves > stems. (3) The indoor simulation test exhibited that the dry-wet alternation and flooding can reduce Cd activity in soil. (4) Redox potential (Eh), rather than pH or organic matter, was the main factor impacting the total content and chemical speciation of heavy metals in the soil, based on a dynamic Bayesian network. Based on the results, we suggest that the activity of heavy metals should be improved by using dry-wet alternation, whereas the proportions of ion-exchangeable forms of heavy metals are relatively low in the study area (except for Cd). Several measures may be taken to enhance soil acidity and reduce the Cd activity during Brassica campestris L. cultivation.
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- 2020
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38. Multi-scale analysis of hydrological connectivity and plant response in the Yellow River Delta
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Guifang Zhang, Zhenming Zhang, Bernard A. Engel, Mingxiang Zhang, Yu Wang, and Jiakai Liu
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Delta ,China ,Salinity ,Environmental Engineering ,010504 meteorology & atmospheric sciences ,Biodiversity ,Climate change ,Wetland ,Chenopodiaceae ,010501 environmental sciences ,Poaceae ,01 natural sciences ,Phragmites ,Soil ,Rivers ,Environmental Chemistry ,Waste Management and Disposal ,0105 earth and related environmental sciences ,Biomass (ecology) ,geography ,geography.geographical_feature_category ,River delta ,Plants ,Pollution ,Salt marsh ,Environmental science ,Physical geography ,Hydrology ,Environmental Monitoring - Abstract
The Yellow River Delta is one of the International Important Wetlands on the west coastline of the Pacific Ocean in China. Despite its importance for regional and global ecological security, it is vulnerable because of human activities and climate change. Local government is trying to identify a more efficient way to conserve the delta thereby reducing a potential environmental crisis. The framework of hydrological connectivity provides a new perspective to study hydrological related ecological processes, while the method is highly exclusive because of environment and scale heterogeneity. This study collaborated with managers to develop a new algorithm to parameterize the hydrological connectivity on plot, point and landscape scales. Then the interspecific and conspecific structures of two dominate species (Phragmites communis and Suaeda salsa) are linked to these indices. The results show: (1) According to the point and plot scale results, AP (semi-artificial pond) and IF (intertidal flat) has the strongest hydrological connectivity followed by TM (tidal marsh). The average positive point-scale index values in AP, IF RS (river side wetland) and TM are 0.610, 0.495, 1.162 and 1.217 and the average plot-scale index values in AP, IF RS and TM are 1.53, 0.87, 0.48 0.55. At the landscape scale, index values show high collinearity with plot density and lack of hydrological significance because of low data resolution and scale effects. (2) At the individual level, P. communis and S. salsa showed a higher interspecific and conspecific competitive strength to respond to environmental stress in the weak hydrological connectivity area. (3) At the community level, in higher salinity wetland classes, biomass, plant coverage and biodiversity showed a positive linear correlation with plot-scale indices. Future study will improve the current parametrization method at the landscape scale and reveal the response of other important plant species to hydrological connectivity in this area.
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- 2020
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39. The blocking effect of atmospheric particles by forest and wetland at different air quality grades in Beijing China
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Wenmei Ma, Hui Zhang, Pengju Chen, Jiexiu Zhai, Guoxin Yan, Yanan Wu, Yu Wang, Ling Cong, and Zhenming Zhang
- Subjects
China ,0208 environmental biotechnology ,Wetland ,02 engineering and technology ,010501 environmental sciences ,Forests ,01 natural sciences ,Beijing ,Air Pollution ,Environmental Chemistry ,Waste Management and Disposal ,Air quality index ,0105 earth and related environmental sciences ,Water Science and Technology ,Hydrology ,geography ,Air Pollutants ,geography.geographical_feature_category ,Blocking (radio) ,Blocking effect ,General Medicine ,Particulates ,020801 environmental engineering ,Wetlands ,Environmental science ,Particulate Matter ,Seasons ,Environmental Monitoring - Abstract
To understand the effect of forests and wetlands on air quality, the PM10 and PM2.5 concentration and meteorological data were collected in the forest and wetland in the Beijing Olympic Forest Park...
- Published
- 2018
40. Influence of rainfall duration and intensity on particulate matter removal from plant leaves
- Author
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Dengxing Fan, Zhenming Zhang, Xinxiao Yu, Le Bao, Xiaowu Xu, Li Mo, and Xiaoxiu Lun
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Pollution ,Environmental Engineering ,010504 meteorology & atmospheric sciences ,media_common.quotation_subject ,Rain ,ved/biology.organism_classification_rank.species ,Air pollution ,010501 environmental sciences ,medicine.disease_cause ,Atmospheric sciences ,01 natural sciences ,Shrub ,medicine ,Environmental Chemistry ,Waste Management and Disposal ,0105 earth and related environmental sciences ,media_common ,Hydrology ,biology ,ved/biology ,Evergreen ,Particulates ,Plants ,biology.organism_classification ,Throughfall ,Plant Leaves ,Environmental science ,Particulate Matter ,Environmental Pollution ,Euonymus japonicus ,Intensity (heat transfer) - Abstract
Rainfall influences removal of airborne particulate matter (PM) from leaf surfaces through a process called wash off resulting in throughfall that carries PM to the ground. The present study examined the effects of rainfall characteristics on PM wash-off mass and rate from the foliage of four broadleaf species, to investigate retention of PM pollution. In a controlled rainfall simulation experiment, rainfall intensity was set to 15, 30, and 50mmh-1, and sampling intervals for the three rainfall intensities were divided into 10, 5, and 3min, respectively. Of the plants examined, the evergreen shrub Euonymus japonicus had the greatest surface PM accumulation before rainfall (165μgcm-2), maximum wash-off during the first 2.5mm of rain (30μgcm-2), and maximum surface PM retention after rainfall (24μgcm-2). Fitting observations with the Box Lucas regression model, cumulative PM wash-off rates increased with cumulative rainfall amount, until the curves tended to become steady after rain exceeded 12.5mm. Wash off removed 51 to 70% of surface PM accumulation. As rainfall intensity increased, the duration of PM wash-off decreased, and wash-off rates were highest during the first rainfall interval. However, there was no significant difference between PM wash-off rates for rainfall intensities of 30 and 50mmh-1 in each rainfall interval. In addition, rain did not remove all PM completely, and PM retention following rainfall differed with rainfall intensity, except for Populus tomentosa.
- Published
- 2017
41. Comparison of dry and wet deposition of particulate matter in near-surface waters during summer
- Author
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Wenmei Ma, Ling Cong, Jiexiu Zhai, Yu Wang, Chunyi Li, Yanan Wu, Jiakai Liu, and Zhenming Zhang
- Subjects
Atmospheric Science ,Topography ,China ,Environmental Engineering ,Time Factors ,010504 meteorology & atmospheric sciences ,Surface Properties ,Rain ,Summer ,Velocity ,lcsh:Medicine ,Marine and Aquatic Sciences ,Wind ,010501 environmental sciences ,01 natural sciences ,Motion ,Meteorology ,Air Pollution ,Desiccation ,lcsh:Science ,0105 earth and related environmental sciences ,Landforms ,Multidisciplinary ,Geography ,Chemical deposition ,Physics ,lcsh:R ,Ecology and Environmental Sciences ,Aquatic Environments ,Classical Mechanics ,Water ,Humidity ,Geomorphology ,Particulates ,Pollution ,Above ground ,Deposition (aerosol physics) ,Wetlands ,Environmental chemistry ,Physical Sciences ,Earth Sciences ,Engineering and Technology ,Water chemistry ,lcsh:Q ,Particulate Matter ,Seasons ,Research Article ,Freshwater Environments - Abstract
Atmospheric particulate matter (PM) deposition which involves both dry and wet processes is an important means of controlling air pollution. To investigate the characteristics of dry and wet deposition in wetlands, PM concentrations and meteorological conditions were monitored during summer at heights of 1.5 m, 6 m and 10 m above ground level at Cuihu Wetland (Beijing, China) in order to assess the efficiency of PM2.5 (particles with an aerodynamic size of 6 m (0.007 ± 0.003 μg·m-2·s-1) > 1.5 m (0.005 ± 0.002 μg·m-2·s-1). And the following deposition fluxes for PM10 were recorded: 10 m (2.163 ± 2.941 μg·m-2·s-1) > 1.5 m (1.565 ± 0.872 μg·m-2·s-1) > 6 m (0.987 ± 0.595 μg·m-2·s-1). In the case of wet deposition, the relative deposition fluxes for PM2.5 and PM10 were 1.5 m > 10 m > 6 m, i.e. there was very little difference between the fluxes for PM2.5 (0.688 ± 0.069 μg·m-2·s-1) and for PM10 (0.904 ± 0.103 μg·m-2·s-1). It was also noted that rainfall intensity and PM diameter influenced wet deposition efficiency. Dry deposition (63%) was more tilted towards removing PM10 than was the case for wet deposition (37%). In terms of PM2.5 removal, wet deposition (92%) was found to be more efficient.
- Published
- 2018
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42. Spatial variability of soil nitrogen and phosphorus of a mixed forest ecosystem in Beijing, China
- Author
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Song S. Qian, Zhenming Zhang, Jianwei Li, and Xinxiao Yu
- Subjects
Global and Planetary Change ,Forest management ,Soil Science ,Geology ,Soil science ,Soil classification ,Pollution ,Soil series ,Vegetation type ,Forest ecology ,Environmental Chemistry ,Environmental science ,Soil horizon ,Spatial variability ,Soil fertility ,Earth-Surface Processes ,Water Science and Technology - Abstract
Spatial patterns of soil nutrient (N and P) were examined using geostatistical analysis in three different soil horizons (A, B, C) in a mixed forest in Beijing China. Soil nutrients (total nitrogen or TN, total phosphorous or TP, and available nitrogen or AN) were high near the surface and lower with depth. In general, the spatial correlation in soil nutrient content varied by depth. Soil nutrient content was also strongly influenced by vegetation type and elevation. These results consist of a set of simple statistical models that could provide information for the planning of the forest management and long-time research in this area.
- Published
- 2009
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43. Particle removal by vegetation: comparison in a forest and a wetland
- Author
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Zhenming Zhang, Yilian Yang, Jiexiu Zhai, Lijuan Zhu, Jiatong Liu, and Jiakai Liu
- Subjects
Pollution ,Canopy ,010504 meteorology & atmospheric sciences ,Health, Toxicology and Mutagenesis ,media_common.quotation_subject ,Wetland ,010501 environmental sciences ,Forests ,01 natural sciences ,Trees ,Beijing ,Environmental Chemistry ,Cities ,Particle Size ,Scavenging ,0105 earth and related environmental sciences ,media_common ,Hydrology ,geography ,geography.geographical_feature_category ,General Medicine ,Vegetation ,Plant Leaves ,Deposition (aerosol physics) ,Biodegradation, Environmental ,Wetlands ,Environmental science ,Particulate Matter ,Stage (hydrology) ,Seasons - Abstract
Vegetation collection is one of the most effective scavenging methods but relevant studies are limited. It can be described by some abstract parameters such as collection rates and deposition fluxes within the canopy. In order to estimate the dry deposition within the canopy of particular matters (PMs) in Beijing, a highly particle-polluted city, and reveal the PM pollution-removal abilities of plants in wetlands and forests, concentration and meteorological data were collected during the daytime in an artificial forest and a wetland in the Olympic Park in Beijing. The dry depositions within the canopy and vegetation collection rates were calculated by a well-developed model and validated by measured deposition fluxes in 11 random experiment days. The experiment year was divided into three plant growth stages based on canopy density, and the day was divided into four different times. Two heights, 10 and 1.5 m, were defined in the forest while in the wetland, 0.5 and 1.5 m were defined. The results showed that in Beijing, the most severe pollution by PMs occurs in the non-leaf stage (NS), and the full-leaf stage (FS) is the cleanest stage. In NS, namely winter, more fossil fuel was used for worms in Beijing and peripheral areas and this might be the reason for the serious pollution condition. Within the canopy, PM deposition fluxes in the wetland are more than those in the forest, but the vegetation collection rates of the forest are higher. The lower temperature conditions led to more dry deposition, and the larger canopy contributed to the higher collection rates. During the daytime, over the year, the deposition of PM10 in three plant growth stages is NS ≥ half-leaf stages (HS) ≥ FS, whereas the deposition of PM2.5 is NS ≥ FS ≥ HS, and during the daytime, the maximum deposition fluxes occur in 6:00–9:00 in the wetland while the minimum deposition values occur in 15:00–18:00. This phenomenon was related to the temporal variation of particle concentration.
- Published
- 2015
44. Removal efficiency of particulate matters at different underlying surfaces in Beijing
- Author
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Jiatong Liu, Jiakai Liu, Yilian Yang, Lichun Mo, Zhenming Zhang, Jinglan Liu, Lijuan Zhu, and Dongdong Qiu
- Subjects
Pollution ,010504 meteorology & atmospheric sciences ,Meteorological Concepts ,Health, Toxicology and Mutagenesis ,media_common.quotation_subject ,Irradiance ,Land cover ,Wind ,010501 environmental sciences ,01 natural sciences ,Wind speed ,Beijing ,Air Pollution ,Environmental Chemistry ,Relative humidity ,0105 earth and related environmental sciences ,media_common ,Hydrology ,Air Pollutants ,Diurnal temperature variation ,General Medicine ,Particulates ,Environmental science ,Particulate Matter ,Seasons ,Environmental Monitoring - Abstract
Particulate matter (PM) pollution has been increasingly becoming serious in Beijing and has drawn the attention of the local government and general public. This study was conducted during early spring of 2013 and 2014 to monitor the concentration of PM at three different land surfaces (bare land, urban forest, and lake) in the Olympic Park in Beijing and to analyze its effect on the concentration of meteorological factors and the dry deposition onto different land cover types. The results showed that diurnal variation of PM concentrations at the three different land surfaces had no significant regulations, and sharp short-term increases in PM10 (particulate matter having an aerodynamic diameter
- Published
- 2015
45. Particulate matter assessment of a wetland in Beijing
- Author
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Lichun Mo, Zhenming Zhang, Dongdong Qiu, Jiakai Liu, and Lijuan Zhu
- Subjects
Wet season ,Environmental Engineering ,Wetland ,complex mixtures ,Animal science ,Dry season ,medicine ,Environmental Chemistry ,Relative humidity ,Particle Size ,Chemical composition ,Weather ,General Environmental Science ,Hydrology ,geography ,Air Pollutants ,geography.geographical_feature_category ,food and beverages ,General Medicine ,Particulates ,Seasonality ,medicine.disease ,Deposition (aerosol physics) ,Beijing ,Wetlands ,Environmental science ,Particulate Matter ,Seasons - Abstract
To increase the knowledge on the particulate matter of a wetland in Beijing, an experimental study on the concentration and composition of PM10 and PM2.5 was implemented in Beijing Olympic Forest Park from 2013 to 2014. This study analyzed the meteorological factors and deposition fluxes at different heights and in different periods in the wetlands. The results showed that the mean mass concentrations of PM10 and PM2.5 were the highest at 06:00-09:00 and the lowest at 15:00-18:00. And the annual concentration of PM10 and PM2.5 in the wetland followed the order of dry period (winter)>normal water period (spring and autumn)>wet period (summer), with the concentration in the dry period significantly higher than that in the normal water and wet periods. The chemical composition of PM2.5 in the wetlands included NH4(+), K(+), Na(+), Mg(2+), SO4(2-), NO3(-), and Cl(-), which respectively accounted for 12.7%, 1.0%, 0.8%, 0.7%, 46.6%, 33.2%, and 5.1% of the average annual composition. The concentration of PM10 and PM2.5 in the wetlands had a significant positive correlation with relative humidity, a negative correlation with wind speed, and an insignificant negative correlation with temperature and radiation. The daily average dry deposition amount of PM10 in the different periods followed the order of dry period>normal water period>wet period, and the daily average dry deposition amount of PM2.5 in the different periods was dry period>wet period>normal water period.
- Published
- 2014
46. Relationship between types of urban forest and PM2.5 capture at three growth stages of leaves
- Author
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Liu Mengmeng, Thithanhthao Nguyen, Xinxiao Yu, Xuhui Liu, and Zhenming Zhang
- Subjects
China ,Environmental Engineering ,Dust pollution ,Forests ,complex mixtures ,Grassland ,Human health ,Urban forest ,Beijing ,Environmental Chemistry ,Cities ,Particle Size ,General Environmental Science ,geography ,Air Pollutants ,geography.geographical_feature_category ,Ecology ,Dust ,General Medicine ,Particulates ,Circadian Rhythm ,Fully developed ,Plant Leaves ,Agronomy ,Environmental science ,Particulate Matter ,Seasons ,Environmental Monitoring - Abstract
Particulate matter diameter ≤ 2.5 μm (PM2.5) causes direct harm to human health. Finding forms of urban forest systems that with the ability to reduce the amount of particulate matter in air effectively is the aim of this study. Five commonly cultivated kinds of urban forest types were studied in Beijing city at three stages of leaf growth. Results show that the urban forest system is capable of storing and capturing dust from the air. The types of shrubs and broadleaf trees that have the ability to capture PM2.5 from the air are most effective when leaves have fully developed. In the leafless season, the conifer and mixed tree types are the most effective in removing dust from the air. For all kinds of forest types and stages of leaf growth, the PM2.5 concentration is highest in the morning but lower in the afternoon and evening. Grassland cannot control particles suspended in the air, but can reduce dust pollution caused by dust from the ground blown by the wind back into the air.
- Published
- 2014
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