Biochar amendment alters the partitioning of nitrate reduction by significantly enhancing DNRA in a paddy field

作     者：Zhijun Wei Mehmet Senbayram Xu Zhao Chenglin Li Ke Jin Min Wu M.Mizanur Rahman Jun Shan Xiaoyuan Yan 

作者机构：State Key Laboratory of Soil and Sustainable AgricultureChangshu National Agro-Ecosystem Observation and Research StationInstitute of Soil ScienceChinese Academy of SciencesNanjing 210008China University of Chinese Academy of SciencesBeijing 100049China Institute of Plant Nutrition and.Soil ScienceUniversity of HarranSanliurfa 63000Turkey Department of Biotechnology and Genetic EngineeringIslamic UniversityKushtia 7003Bangladesh 

出 版 物：《Biochar》 (生物炭（英文）)

年 卷 期：2022年第4卷第1期

页      面：460-477页

核心收录：

学科分类：09[农学] 0903[农学-农业资源与环境] 090301[农学-土壤学] 

基　　金：the National Natural Science Foundation of China(No.U20A20113 and 42177303) the National Key Research and Development Program of China(No.2021YFD1700802) 

主　　题：Nitrate reduction Nitrate partitioning N_(2)O Biochar Paddy field 

摘      要：Using 15N tracer technique,we investigated the potential rates of denitrification,anaerobic ammonium oxidation,dis-similatory nitrate reduction to ammonium(DNRA),and their partitioning among nitrate reduction,as well as the N_(2)O emission rates in a paddy soil receiving various biochar(0%,0.03%,0.1%,0.5%,and 1.0%;w/w)and straw(0.1%)over six consecutive *** showed that except for the 1.0%amendment treatment,biochar significantly(P0.05)increased denitrification rates by 10.19‒75.96%compared with non-biochar amended treatment,and that biochar significantly(P0.05)increased DNRA rates by 1.63‒6.84 folds relative to non-biochar amended ***-quently,biochar shifted more NO3-partitioning toward DNRA process,as suggested by the increased DNRA/(denitri-fication+DNRA)ratios from 1.60 to 13.18%.On the other hand,biochar significantly(P0.05)reduced N_(2)O emission rates by 61.86-97.65%accompanied by a significant decrease in N_(2)O/(N_(2)O+N_(2))ratios(65.29-98.39%),indicating bio-char amendment facilitated the reduction of N_(2)O to N_(2).The promoting effects of biochar on DNRA rates and DNRA/(denitrification+DNRA)ratios were attributed to the increased carbon availability and the altered nitrate reducer ***,our study suggests that biochar amendment in the paddy soil is helpful for N conservation by favoring nitrate partitioning toward DNRA process,which deepens our understanding of how biochar mediates N cycling in the paddy field.