生物炭
浸出(土壤学)
化学
土壤水分
肥料
农学
氮气
铵
固碳
环境化学
反硝化细菌
修正案
反硝化
环境科学
土壤科学
生物
法学
有机化学
热解
政治学
作者
Yuping Zhang,Hang Zhao,Wang Hu,Yizhe Wang,Hanfeng Zhang,Xuan Zhou,Jiangchi Fei,Gongwen Luo
出处
期刊:Chemosphere
[Elsevier]
日期:2022-05-01
卷期号:295: 133904-133904
被引量:12
标识
DOI:10.1016/j.chemosphere.2022.133904
摘要
Biochar application to chemical-amended paddy soils has been proposed as a potential strategy to enhance nitrogen (N) retention and nitrogen use efficiency (NUE) by crops. However, optimal concentrations for these enhancements and the potential drivers are not well understood. Herein, a column-based pot experiment was carried out to investigate the impacts of reed-biochar application rate on N losses and dynamics in paddy soils treated by chemical fertilizer, and particularly, to explore the dominant factors of the processes. The addition of 2-4% reed-biochar had the most significant effects on mitigating N loss by leaching. Reed-biochar amendment increased soil total N and mineral N (NH4+-N and NO3--N) content, and denitrifying gene abundance, and the increments of those variables were positively related to the application rate. Soil treated with 1-4% reed-biochar at harvest period showed higher gene abundances of ammonia-oxidizing and dissimilatory nitrate reduction to ammonium (DNRA) and higher activity of β-1,4-N-acetyl-glucosaminidase (NAG) and leucine aminopeptidase compared with the 4-8% application rate. The amoA-AOA gene abundance, NAG activity, and total carbon (C) content were the main predictors of total N and mineral N accumulated leakage. Total C content was the main predictor of soil total N and mineral N content, followed by the pH and NAG activity. These results suggest that adding 2-4% reed-biochar was more beneficial to mitigate N loss and thus enhance soil N storage and availability. This study highlights the importance of understanding how microbial populations mediate N transformation to decipher biochar-driven NUE enhancement in paddy soils.
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