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 

机构地区：[1]Key Laboratory of Mountain Surface Processes and Ecological Regulation,Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610041,China [2]College of Resources and Environment,Huazhong Agricultural University,Wuhan 430070,China [3]Hubei Collaborative Innovation Centre for Grain Industry,College of Agriculture,Yangtze University,Jingzhou 434025,China [4]College of Agriculture,Henan University of Science and Technology,Luoyang 471000,China [5]College of Urban and Environmental Sciences,Hubei Normal University,Huangshi 435002,China [6]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Journal of Integrative Agriculture》2024年第8期2792-2806,共15页农业科学学报（英文版）

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

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 cultivation.It is imperative to understand the influences of different upland crop planting systems on soil N_(2)O emissions.In 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 emissions.The 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,respectively.These 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 systems.Strong 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 systems.Moreover,the presence of the AOA-amoA and nirK genes were positively associated with soil N_(2)O fluxes in the RR and WR systems,respectively.This implies that these genes may have different potential roles in facilitating microbial N_(2)O production in various upland plantation models.By 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 system.In 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 emissions.These findings demonstrate the interactive effects of functional genes and soil factors,including soil physical characteristics,av

关 键 词：upland-rice cultivation N_(2)O emission regulatory factors functional genes 

分 类 号：S154.1[农业科学—土壤学]