Regulatory potential of soil available carbon,nitrogen,and functional genes on N_(2)O emissions in two upland plantation systems

作     者：Peng Xu Mengdie Jiang Imran Khan Muhammad Shaaban Hongtao Wu Barthelemy Harerimana Ronggui Hu Peng Xu;Mengdie Jiang;Imran Khan;Muhammad Shaaban;Hongtao Wu;Barthelemy Harerimana;Ronggui Hu

作者机构：Key Laboratory of Mountain Surface Processes and Ecological RegulationInstitute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China College of Resources and EnvironmentHuazhong Agricultural UniversityWuhan 430070China Hubei Collaborative Innovation Centre for Grain IndustryCollege of AgricultureYangtze UniversityJingzhou 434025China College of AgricultureHenan University of Science and TechnologyLuoyang 471000China College of Urban and Environmental SciencesHubei Normal UniversityHuangshi 435002China University of Chinese Academy of SciencesBeijing 100049China 

出 版 物：《Journal of Integrative Agriculture》 (农业科学学报（英文版）)

年 卷 期：2024年第23卷第8期

页      面：2792-2806页

核心收录：

学科分类：07[理学] 0713[理学-生态学] 

基　　金：the National Key Research and Development Program of China(2017YFD0800102) the Hubei Provincial Key Research and Development Program,China(2021BCA156) 

主　　题：upland-rice cultivation N_(2)O emission regulatory factors functional genes 

摘      要：Dynamic nitrification and denitrification processes are affected by changes in soil redox conditions,and they play a vital role in regulating soil N_(2)O emissions in rice-based *** is imperative to understand the influences of different upland crop planting systems on soil N_(2)O *** this study,we focused on two representative rotation systems in Central China:rapeseed–rice(RR)and wheat–rice(WR).We examined the biotic and abiotic processes underlying the impacts of these upland plantings on soil N_(2)O *** results revealed that during the rapeseed-cultivated seasons in the RR rotation system,the average N_(2)O emissions were 1.24±0.20 and 0.81±0.11 kg N ha^(–1)for the first and second seasons,*** values were comparable to the N_(2)O emissions observed during the first and second wheat-cultivated seasons in the WR rotation system(0.98±0.25 and 0.70±0.04 kg N ha^(–1),respectively).This suggests that upland cultivation has minimal impacts on soil N_(2)O emissions in the two rotation *** positive correlations were found between N_(2)O fluxes and soil ammonium(NH_(4)^(+)),nitrate(NO_(3)^(–)),microbial biomass nitrogen(MBN),and the ratio of soil dissolved organic carbon(DOC)to NO_(3)^(–)in both RR and WR rotation ***,the presence of the AOA-amoA and nirK genes were positively associated with soil N_(2)O fluxes in the RR and WR systems,*** implies that these genes may have different potential roles in facilitating microbial N_(2)O production in various upland plantation *** using a structural equation model,we found that soil moisture,mineral N,MBN,and the AOA-amoA gene accounted for over 50%of the effects on N_(2)O emissions in the RR rotation *** the WR rotation system,soil moisture,mineral N,MBN,and the AOA-amoA and nirK genes had a combined impact of over 70%on N_(2)O *** findings demonstrate the interactive effects of functional genes and soil factors,including