Leguminous green manure mitigates methane emissions in paddy field by regulating acetoclastic and hydrogenotrophic methanogens

文献类型： 外文期刊

第一作者： Raheem, Abdulkareem

作者： Raheem, Abdulkareem;Danso, Frederick;Bankole, Oluwaseyi Oyewale;Gao, Jusheng;Zhang, Jun;Wang, Tianshu;Huang, Jing;Gao, Jusheng;Huang, Jing;Gao, Jusheng;Zhang, Jun;Gao, Jusheng

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关键词： Long-term green manuring; Methane flux; Methanogens; Double rice cropping system

期刊名称：EUROPEAN JOURNAL OF SOIL BIOLOGY （ 影响因子：3.232； 五年影响因子：4.009 ）

ISSN： 1164-5563

年卷期： 2022 年 108 卷

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收录情况： SCI

摘要： Green manure is important for crop yield sustainability. However, its impact on methane (CH4) emissions in paddy soils is poorly understood. Based on a 37-year experiment, we linked methanogenic and methanotrophic communities to CH4 emissions under a green manure-based double rice cropping system. The treatments were: ryegrass-rice-rice (R), milk vetch-rice-rice (M) and fallow-rice-rice (F). The early and late rice yield where within the range of 3760.0 and 4933.3 kg ha(-1), and 5040.0 and 6373. 3 kg ha(-1), respectively. Meanwhile, the CH4 fluxes ranged from, 0.02-168.71 mg m(-2) h(-1). Green manure increased annual rice yield by 16.1-25.3%, as against F (P < 0.05). However, R increased cumulative CH4 emissions by 90.2% (P < 0.05) whereas M showed no significant stimulation, relative to F. The total CH4 emissions notably correlated with dissolved organic carbon (DOC) (r = 0.80, P < 0.01) and the gene copy numbers of mcrA (r = 0.78, P < 0.05), but not pmoA (r = 0.65, P > 0.05). The relative abundances of acetoclastic methanogens belonging to the family Methanosarcinaceae, and hydrogenotrophic methanogens of the orders Methanocellales and Methanobacteriales, were lower in M, as against R (P < 0.05), and correlated with the total CH4 emissions (r = 0.90, 0.84, 0.96, respectively, P < 0.01). Our findings suggest that leguminous green manure improves rice yield, and mitigates CH4 emissions by regulating both acetoclastic and hydrogenotrophic methanogenic communities.

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