Sustained Green Manure‐Rice Rotations Can Mitigate Methane Emissions by Enhancing Microbial Methane Oxidation in Southern China
2025
Liang, Hao | Fu, Jin | Zhou, Guopeng | Feng, Jiguang | Zhu, Qiuan | Smith, Pete | Gabrielle, Benoît | Li, Tao | Schmidt, Susanne | Xu, Changxu | Liu, Jia | Nie, Jun | Wu, Ji | Geng, Mingjian | Wang, Fei | Liang, Yuting | Cao, Weidong | Zhou, Feng | Hohai University | Anhui Agricultural University [Hefei] | State Key Laboratory of Efficient Arable Land Utilization in China. Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China. | University of Aberdeen | Ecologie fonctionnelle et écotoxicologie des agroécosystèmes (ECOSYS) ; AgroParisTech-Université Paris-Saclay-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | International Rice Research Institute [Philippines] (IRRI) ; Consultative Group on International Agricultural Research [CGIAR] (CGIAR) | The University of Queensland (UQ [All campuses : Brisbane, Dutton Park Gatton, Herston, St Lucia and other locations]) | Jiangxi Academy of Agricultural Sciences | Hunan Agricultural University [Changsha] | Anhui Agriculture University (AHAU) | Huazhong Agricultural University [Wuhan] (HZAU) | Fujian Academy of Agricultural Sciences | State Key Laboratory of Soil and Sustainable Agriculture ; Institute of Soil Science ; Chinese Academy of Sciences [Beijing] (CAS)-Chinese Academy of Sciences [Beijing] (CAS) | Chinese Academy of Agricultural Sciences (CAAS) | College of Urban and Environmental Sciences [Beijing] ; Peking University [Beijing] | This study was supported by National Key Research and Development Program of China (2021YFD1700200) and National Natural Science Foundation of China (42361144876; 42477374; 42225102)
International audience
Show more [+] Less [-]English. Green manure (GM) enhances the ecological services in agricultural ecosystems, including soil health and carbon sequestration. However, its effect on regional methane (CH 4 ) emissions from paddy fields is unclear. Here we clarify the impacts of GM rotation by combining process-based modeling with microbial gene abundance information and coordinated distributed observations at 14 sites in southern China. We found that GM management, including application rate and rotation year, mainly affects CH 4 emissions in GM-rice systems by impacting soil biotic factors, which explain 78.4% of the variation (p < 0.001). The most influential factor is the ratio of soil CH 4 production to oxidation gene abundances (R 2 = 0.510; p < 0.001), which decreases with GM rotation year due to increased activity of methane-oxidizing soil microbes (p < 0.001), indicating that CH 4 emissions from GM-rice systems decrease with increased GM rotation year. By incorporating these microbial mechanisms as quantitative parameters in process-based model, we project that approximately 76% of the paddy rice areas in southern China, which have relatively low GM biomass and baseline CH 4 emissions, can achieve reductions in CH 4 emissions through nearly 15 years of GM crop rotation. This study indicates that CH 4 emissions from GM-rice rotations with appropriate GM application rate over the long term will not significantly increase, resolving the contradictions in previous research
Show more [+] Less [-]AGROVOC Keywords
Bibliographic information
This bibliographic record has been provided by Institut national de la recherche agronomique