Co-incorporating leguminous green manure and rice straw drives the synergistic release of carbon and nitrogen, increases hydrolase activities, and changes the composition of main microbial groups

文献类型： 外文期刊

第一作者： Zhou, Guopeng

作者： Zhou, Guopeng;Chang, Danna;Liang, Ting;Cao, Weidong;Gao, Songjuan;Cao, Weidong;Liu, Rui

作者机构：

关键词： Rice straw; Chinese milk vetch; Mixed residues; Enzyme activity; Microorganisms; Paddy soil

期刊名称：BIOLOGY AND FERTILITY OF SOILS （ 影响因子：6.432； 五年影响因子：6.332 ）

ISSN： 0178-2762

年卷期： 2021 年 57 卷 4 期

页码：

收录情况： SCI

摘要： Rice straw (RS) was incorporated into paddy soil together with leguminous green manure (e.g., Chinese milk vetch, Astragalus sinicus L., MV) in a mesocosm-scale experiment and the enzyme activity and composition of main microbial groups were measured. Mixing MV and RS caused a synergistic release of residual C and N, leading to a low C/N ratio at the middle and late decomposition stages of the mixture and shortening the time to complete decomposition. Furthermore, the highest abundances of Gram-negative (G(-)) bacteria and fungi and the highest activities of alpha- and beta-glucosidase, beta-cellobiosidase, beta-xylosidase, N-acetyl-glucosaminidase, and acid phosphomonoesterase were observed in the residue mixture, especially at the middle and late stages of the experiment. The residue decomposition rate was positively correlated with residual N and mineral N concentrations. Most hydrolases and both oxidase (phenol oxidase and peroxidase) activities, and G(-) bacterial (especially 18:1 omega 5c, Photobacterium) abundance explained the decomposition of mixing residues. In conclusion, co-incorporation of MV and RS could stimulate their decomposition by retaining a relatively low C/N ratio, enhancing G(-) bacterial abundance and hydrolase activities. Introducing leguminous green manures in paddy fields may be an effective way to accelerate the decomposition of rice straw.

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