Search

Your search keyword '"Xing, Shihe"' showing total 164 results
Start Over Author "Xing, Shihe"
164 results on '"Xing, Shihe"'

26. Evaluation of Biochar and Inorganic Fertilizer on Soil Available Phosphorus and Bacterial Community Dynamics in Acidic Paddy Soils for Different Incubation Temperatures.

Author

Sarfraz, Rubab, Nadeem, Faisal, Yang, Wenhao, Tayyab, Muhammad, Khan, Muhammad Israr, Mahmood, Rashid, Guo, Xingjie, Xing, Shihe, and Kim, Gil Won

Subjects
ACID soils, BACTERIAL communities, BIOCHAR, SOIL amendments, RED soils
Abstract

The composition of microbial communities and the functioning of ecosystems are greatly influenced by the nutrient inputs. Despite this fact, our knowledge regarding the impact of phosphorus (P) inputs on soil P availability and microbial community structures in subtropical acidic soils remains limited. We hypothesized that diverse P inputs, incubation temperatures, and soil types could significantly alter soil P availability and microbial communities. To address this gap, we conducted a laboratory incubation experiment, investigating the effects of biochar and inorganic P amendments on soil available P, soil pH, acid phosphatase enzymes, and bacterial abundance. We employed two different incubation temperatures (15 °C and 25 °C) using acidic paddy soil and red soil from the subtropical Southern China region. Our results indicate a notable increase in soil pH, reaching 37% and 39% at 15 °C and 40% and 40.6% at 25 °C, respectively, following the application of biochar and inorganic P amendments in paddy soil. In the case of red soil, we observed pH increases of 41% and 43% at 15 °C and 44% and 45% at 25 °C after the application of biochar and inorganic P amendment, respectively. The addition of inorganic P amendment resulted in the highest available P contents in paddy soil, reaching 111.47 mg/kg at 15 °C and 100.17 mg/kg at 25 °C, respectively. However, Proteobacteria decreased after inorganic P addition, which showed that P might not be the only limiting nutrient for various bacterial communities. Bacterial diversity and richness indices were found to be higher after biochar application in both soils. Gemmatimonadetes, Acidobacteria, and Actinobacteria were found to be strongly influenced by incubation temperatures, whereas most of the top abundant bacterial phyla, such as Gemmatimonadetes, Actinobacteria, Chloroflexi, Acidobacteria, Planctomycetes, Firmicutes, Patescibacteria, and Bacteroidetes, were highly dependent on soil type. At the genus level, various important P solubilizing genera (Pseudomonas, Bradyrhizobium, Streptomyces jietaisiensis, Massilia) significantly increased after biochar and inorganic P addition in both soils. The correlation analysis proved that P-solubilizing genera were significantly associated with changes in soil pH, as well as soil available P after biochar and inorganic P addition. Conclusively, in a short-term incubation experiment, inorganic P amendment greatly increased the soil pH and available phosphorus contents compared to biochar and control treatments; however, the microbial community was observed to be strongly associated with biochar application, soil type, and incubation temperature. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

48. Comparative Impact of Bacillusspp. on Long-Term N Supply and N-Cycling Bacterial Distribution Under Biochar and Manure Amendment

Author

Ibrahim, Muhammed Mustapha, Guo, Liming, Zhang, Hongxue, Wu, Fengying, Zou, Shuangquan, Xing, Shihe, and Mao, Yanling

Abstract

There are rising concerns about the negative environmental impacts of excessive N fertilizers used in agriculture. However, perennial crops require periodic large N doses for optimum growth. Hence, minimizing N application and regulating its long-term availability using N-cycling-mediating bacteria is a viable option that remains unexplored. We explored the comparative potentials of biochar and manure to provide a conducive condition for Bacillus subtilisand Bacillus licheniformisto improve their effects on N-cycling enzyme activity, the distribution of indigenous N-cycling-related bacteria, and long-term N availability for the growth of Nageia nagiafter one year of single N dose. Results showed that NH4+-N did not vary across the treatments. While NO3--N showed no variation between the fertilizer+biochar (FB) and fertilizer+manure (FM) treatments, dissolved organic-N (DON) increased in FB. Inoculation+fertilizer+biochar (FBI) induced a potential N-cycling enzyme activity, hence, an increase in NO3--N, DON, and amino acid-N concentrations compared to inoculation+fertilizer+manure (FMI). This was associated with increased plant growth and leaf-N concentration in the inoculated treatments. Higher N-cycling due to Bacillusspp. inoculation increased the diversity of soil bacteria in FMI compared to FBI and other treatments. However, an increase in the relative abundance of some key nitrification-related bacterial taxa in FBI (Betaproteobacteria, Gammaproteobacteria, and Actinobacteria) was associated with higher N-cycling enzyme activity, NO3--N, DON, and amino acid-N concentrations compared to FMI. Due to low persistence, the long-term effect of Bacillusspp.on N release was mainly indirect, through their stimulatory effect on N-cycling enzyme activity and bacterial community. Therefore, periodic inoculation in biochar amended soils could be important in sustaining long-term N availability.

Published
2022
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results