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154 results on '"Dai, Jiulan"'

11. Low-Cadmium Wheat Cultivars Limit the Enrichment, Transport and Accumulation of Cadmium.

Author

Bai, Liyong, Ding, Suo, Li, Xiaoli, Ning, Chuanli, Liu, He, Sun, Mei, Liu, Dongmei, Zhang, Ke, Li, Shuangshuang, Yu, Xiaojing, and Dai, Jiulan

Subjects
CULTIVARS, CADMIUM, STRUCTURAL equation modeling, DIETHYLENETRIAMINEPENTAACETIC acid, WHEAT, GRAIN, SOIL acidity
Abstract

Low-cadmium (Cd) accumulating wheat cultivars (LAWC-Cds) can effectively reduce the total Cd content in wheat grains (Grain-Cd). Thirteen LAWC-Cds were planted in three fields to study the enrichment, transport, and accumulation patterns of Cd in LAWC-Cds. Compared with the soil properties before planting, the soil pH and the total Cd content in the soil decreased, while the Cd content in the diethylenetriaminepentaacetic acid extract, soil conductivity, and soil organic matter increased at wheat maturity. The Cd enrichment capacity of the different organs of wheat decreased in the following order: root > leaf > rachis > stem > glume > grain. The dynamics of Cd accumulation in roots affected Grain-Cd, and these factors were negatively correlated. The Cd content and Cd accumulation in all organs of LAWC-Cds showed strong negative correlations with the lengths of the first and second internodes and highly significant positive correlations with both grains per spike and awn length. Structural equation modeling showed that the Cd content of wheat organs had the most direct effect (0.639) in determining Grain-Cd, and soil properties had the largest effect (0.744) in influencing Grain-Cd. This study is important for screening wheat cultivars with stable low Cd-accumulation characteristics. [ABSTRACT FROM AUTHOR]

Published
2024
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30. Soil bacterial community response to long-term land use conversion in Yellow River Delta

Author

He, Huan, Miao, Yongjun, Gan, Yandong, Wei, Shaodong, Tan, Shangjin, Rask, Klara Andrés, Wang, Lihong, Dai, Jiulan, Chen, Weifeng, Ekelund, Flemming, He, Huan, Miao, Yongjun, Gan, Yandong, Wei, Shaodong, Tan, Shangjin, Rask, Klara Andrés, Wang, Lihong, Dai, Jiulan, Chen, Weifeng, and Ekelund, Flemming

Abstract

Yellow River Delta undergoes intensive conversion from natural wetland to agricultural fields and artificial woodland. In this study, we analysed how the conversion affects bacterial community diversity and composition by Illumina Miseq sequencing combined with functional prediction. Compared to natural wetland, arable land and woodland were featured with higher soil organic matter, total nitrogen and bacterial diversity, but lower electrical conductivity. The bacteria Gemmatimonadetes related to soil organic matter and total nitrogen, was enriched in arable land, while salt-resistant bacteria (e.g. phylum Chloroflexi and its class Ardenticatenia) were abundant in natural wetland. Moreover, the relative abundances of the nitrifying bacteria Nitrospira and Nitrosospira were significantly higher in arable land and woodland than in natural wetland, suggesting that land use changes significantly affect the bacterial processes involved in nitrogen cycling. Redundancy analysis (RDA) showed that the differences in bacterial community were attributed to soil nutrient-related properties (i.e., total nitrogen and soil organic matter), soil salinity (i.e., electrical conductivity), and heavy metals (i.e. Cu and Cr). PICRUSt results revealed that land use conversion from natural wetland to arable land increased soil functions, e.g., biosynthesis process and oxidative phosphorylation. The data help us elucidate how land use changes affect terrestrial ecosystem function, and advise local farmers to apply the suitable land-use strategies and keep agricultural sustainable development.

Published
2020

31. Screening stably low cadmium and moderately high micronutrients wheat cultivars under three different agricultural environments of China

Author

Liu, Na, Huang, Xianmin, Sun, Leiming, Li, Shuangshuang, Chen, Yihui, Cao, Xiaoyu, Wang, Wenxing, Dai, Jiulan, Rinnan, Riikka, Liu, Na, Huang, Xianmin, Sun, Leiming, Li, Shuangshuang, Chen, Yihui, Cao, Xiaoyu, Wang, Wenxing, Dai, Jiulan, and Rinnan, Riikka

Abstract

Heavy metal-contaminated farmland, especially for cadmium (Cd), is being used for agricultural production in large scale due to the increasing food demand. Thus, minimizing the influx of Cd to the human food chain is urgently needed. Screening for stably low Cd and moderately high micronutrient wheat cultivars is one of the most feasible and effective approaches to ensure food safety and quality. Here, the Cd accumulation by 72 wheat cultivars was identified in field 1, and the stability of Cd accumulation in these cultivars was tested in fields 2 and 3. The effects of Cd on micronutrient (zinc (Zn), copper (Cu), iron (Fe), manganese (Mn), and boron (B)) uptake in grains were also investigated. Nine of the 24 low-Cd wheat cultivars identified by screening showed stably low-Cd and moderately high micronutrient concentrations in grain. Nine cultivars exhibited unstable low-Cd accumulation characteristics, and another five cultivars contained significantly lower Zn concentrations in grain in at least two experimental fields. One low-Cd cultivar also had low Zn, Cu and Mn concentrations in grain. The accumulation of Cd in wheat grain had little effects on the uptake of Fe. Grain Cd concentration correlated positively with the dry weight of stem and root, and negatively with the spike length. There was no correlation between grain Cd concentration and wheat yield. The selected cultivars with stably low-Cd accumulation and moderately high micronutrient concentrations in grain are recommended for cultivation in slightly to moderately Cd-contaminated farmland to ensure food safety for the growing human population.

Published
2020

47. Adsorption Characteristics and the Effect of Dissolved Organic Matter on Mercury(II) Adsorption of Various Soils in China.

Author

Wu, Fan, Liu, Hui, Zhang, Mengmeng, Ma, Wen, Huang, Xianmin, Liu, Shuwei, and Dai, Jiulan

Subjects
DISSOLVED organic matter, MERCURY in soils, WHEAT straw, ADSORPTION (Chemistry)
Abstract

To evaluate the adsorption characteristics and effects of dissolved organic matter (DOM) from wheat straw (DOMW) and swine manure (DOMS) on mercury [Hg(II)] adsorption by soils, a series of experiments was conducted on 26 soils with different soil properties.Results showed that the values ofKd(a solid–liquid partition coefficient) of soils varied within a range of 0.768–14.386 L g−1.Kdvalues were mainly controlled by soil organic matter (SOM), cation exchange capacity (CEC), soil nitrogen (N), and soil sulfur (S). When DOMWand DOMSwere added to the soil samples, the amount of Hg(II) adsorbed by the soils decreased significantly. Furthermore, based on the decreased percentage of adsorption of Hg(II) by soil upon adding DOMW(PDOMW) or DOMS(PDOMS), about 73.08% soils, the values ofPDOMSwere smaller than those ofPDOMW. ThePDOMWvalues were related to SOM, pH, free Fe oxide content, and CEC, whereasPDOMSvalues were related to soil free Fe/Al oxide contents. Therefore, we should pay more attention about mercury risk caused by the addition of exogenous organic matter in soils, especially for the soils with low or high pH, less SOM, low CEC, and less free Fe/Al oxide. [ABSTRACT FROM AUTHOR]

Published
2017
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