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• W3201733448 abstract "Biochar application can influence soil nitrogen (N) cycle through biological and abiotic processes. However, studies on comprehensive examination of the effects of biochar application on microbially mediated N-cycling processes (N mineralization, nitrification, denitrification, and fixation) and soil N fate (i.e., plant N uptake, soil N2O emission, and N leaching) are warranted. Therefore, the aim of this study was to examine the effects of biochar application on soil N transformation, microbial functional gene abundance, enzyme activity, and plant N uptake. To achieve the objective of this study, a meta-analysis involving 131 peer-reviewed field experiments was conducted. Results showed that field application of biochar significantly enhanced soil and content, N mineralization, nitrification, N2 fixation, and plant N uptake by 5.3%, 3.7%, 15.3%, 48.5%, 14.7%, and 18.3%, respectively, but reduced N2O emissions and N leaching by 14.9% and 10.9%, respectively. Biochar application also increased the abundance of soil denitrifying/nitrifying genes (amoA, narG, nirS/nirK+S, and nosZ), proportion of N2 fixation bacteria, and N-acetyl-glucosaminidase activity by 18.6%–87.6%. Soil content was positively correlated with AOA-amoA abundance, and soil N2O emission was positively correlated with the relative abundance of genes (e.g., amoA, narG, and nirS/nirK) involved in N2O production. Furthermore, long-term biochar application tended to increase AOB-amoA and nirK+S abundance, especially soil N2O emission and N leaching. Overall, the findings of this study indicated that biochar application accelerated microbially mediated N-cycling processes under field conditions, thereby enhancing soil N availability and plant productivity. However, long-term biochar application may increase N losses. Therefore, future studies should be conducted to examine the effect of long-term biochar application on the soil N cycle and the underlying microbial mechanisms." @default.
• W3201733448 created "2021-10-11" @default.
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• W3201733448 date "2021-10-09" @default.
• W3201733448 modified "2023-10-17" @default.
• W3201733448 title "Effects of biochar application on soil nitrogen transformation, microbial functional genes, enzyme activity, and plant nitrogen uptake: A meta‐analysis of field studies" @default.
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• W3201733448 doi "https://doi.org/10.1111/gcbb.12898" @default.
• W3201733448 hasPublicationYear "2021" @default.
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