Understanding how reed-biochar application mitigates nitrogen losses in paddy soil: Insight into microbially-driven nitrogen dynamics
文献类型： 外文期刊
作者： Zhang, Yuping 1 ; Zhao, Hang 1 ; Hu, Wang 1 ; Wang, Yizhe 1 ; Zhang, Hanfeng 1 ; Zhou, Xuan 3 ; Fei, Jiangchi 1 ; Luo, Gongwen 1 ;
作者机构： 1.Hunan Agr Univ, Coll Resources & Environm, Hunan Prov Key Lab Farmland Pollut Control & Agr, Changsha 410128, Peoples R China
2.Natl Engn Lab Efficient Utilizat Soil & Fertilize, Changsha 410128, Peoples R China
3.Hunan Acad Agr Sci, Inst Soil & Fertilizer, Changsha 410125, Peoples R China
4.Chinese Acad Sci, Inst Subtrop Agr, Key Lab Agroecol Proc Subtrop Reg, Changsha 410125, Peoples R China
关键词： Reed biochar; Paddy soil; Nitrogen loss; Nitrogen dynamics; Functional population; Extracellular enzyme
期刊名称：CHEMOSPHERE （ 影响因子：8.943； 五年影响因子：8.52 ）
ISSN： 0045-6535
年卷期： 2022 年 295 卷
页码：
收录情况： SCI
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 beta-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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