Nitrogen enrichment regulates straw decomposition and its associated microbial community in a double-rice cropping system

文献类型： 外文期刊

第一作者： Guo, Tengfei

作者： Guo, Tengfei;Zhang, Qian;Ai, Chao;Liang, Guoqing;He, Ping;Zhou, Wei

作者机构：

期刊名称：SCIENTIFIC REPORTS （ 影响因子：4.379； 五年影响因子：5.133 ）

ISSN： 2045-2322

年卷期： 2018 年 8 卷

页码：

收录情况： SCI

摘要： Litter bag method was conducted to investigate the decomposition characteristics of rice straw (6000 kg ha(-1)) and its associated microbial community under different nitrogen (N) addition rates (0, 90, 180 and 270 kg N ha(-1)) under double-rice rotation. Generally, straw mass reduction and nutrient release of rice straw were faster in early stage of decomposition (0-14 days after decomposition), when easilyutilized carbohydrates and amines were the preferential substrates for involved decomposers. Strawassociated N-acetyl-glucosamidase and L-leucine aminopeptidase activities, which were higher under 180 and 270 kg N ha(-1) addition, showed more activities in the early stage of decomposition. Grampositive bacteria were the quantitatively predominant microorganisms, while fungi and actinomycetes played a key role in decomposing recalcitrant compounds in late decomposition stage. Straw residue at middle decomposition stage was associated with greater cbhI and GH48 abundance and was followed by stronger beta-glucosidase, beta-cellobiohydrolase and beta-xylosidase activities. Although enzyme activities and cellulolytic gene abundances were enhanced by 180 and 270 kg N ha(-1) application, microbial communities and metabolic capability associated with rice straw were grouped by sampling time rather than specific fertilizer treatments. Thus, we recommended 180 kg N ha(-1) application should be the economical rate for the current 6000 kg ha(-1) rice straw returning.

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