Regulatory potential of soil available carbon,nitrogen,and functional genes on N2O emissions in two upland plantation systems

Peng Xu ¹Mengdie Jiang ²Imran Khan ³Muhammad Shaaban ⁴Hongtao Wu ⁵Barthelemy Harerimana ⁶Ronggui Hu³

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作者信息

1. Key Laboratory of Mountain Surface Processes and Ecological Regulation,Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610041,China;College of Resources and Environment,Huazhong Agricultural University,Wuhan 430070,China
2. College of Resources and Environment,Huazhong Agricultural University,Wuhan 430070,China;Hubei Collaborative Innovation Centre for Grain Industry,College of Agriculture,Yangtze University,Jingzhou 434025,China
3. College of Resources and Environment,Huazhong Agricultural University,Wuhan 430070,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. Key Laboratory of Mountain Surface Processes and Ecological Regulation,Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610041,China;University of Chinese Academy of Sciences,Beijing 100049,China
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Abstract

Dynamic nitrification and denitrification processes are affected by changes in soil redox conditions,and they play a vital role in regulating soil N2O emissions in rice-based cultivation.It is imperative to understand the influences of different upland crop planting systems on soil N2O 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 N2O emissions.The results revealed that during the rapeseed-cultivated seasons in the RR rotation system,the average N2O 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 N2O 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 N2O emissions in the two rotation systems.Strong positive correlations were found between N2O fluxes and soil ammonium(NH4+),nitrate(NO3-),microbial biomass nitrogen(MBN),and the ratio of soil dissolved organic carbon(DOC)to NO3-in both RR and WR rotation systems.Moreover,the presence of the AOA-amoA and nirK genes were positively associated with soil N2O fluxes in the RR and WR systems,respectively.This implies that these genes may have different potential roles in facilitating microbial N2O 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 N2O 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 N2O emissions.These findings demonstrate the interactive effects of functional genes and soil factors,including soil physical characteristics,available carbon and nitrogen,and their ratio,on soil N2O emissions during upland cultivation seasons under rice-upland rotations.

Key words

upland-rice cultivation/N2O emission/regulatory factors/functional genes

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基金项目

National Key Research and Development Program of China(2017YFD0800102)

Hubei Provincial Key Research and Development Program,China(2021BCA156)

出版年

2024

农业科学学报(英文)

中国农业科学院农业信息研究所

农业科学学报(英文)

CSTPCD

影响因子：0.576

ISSN：2095-3119

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