The dominant microorganisms vary with aggregates sizes in promoting soil carbon accumulation under straw application

文献类型： 外文期刊

第一作者： Lu, Jinjing

作者： Lu, Jinjing;Li, Shengping;Wu, Xueping;Zhang, Mengni;Zheng, Fengjun;Lu, Jinjing;Li, Shengping;Degre, Aurore;Lu, Jinjing;Gao, Chunhua;Li, Jianhua;Jin, Dongsheng;Liang, Guopeng;Wang, Bisheng

作者机构：

关键词： C accumulation; soil aggregate; straw; microorganisms; bacteria; fungi

期刊名称：ARCHIVES OF AGRONOMY AND SOIL SCIENCE （ 影响因子：3.092； 五年影响因子：2.745 ）

ISSN： 0365-0340

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收录情况： SCI

摘要： Unraveling the influence of microbes on C content at aggregate scale is pivotal for promoting soil C accumulation. Previous studies were based mainly on the mutual transformation process between aggregates, the links between the microorganisms in initial aggregates and inner C content and aggregate sizes were still unclear. In this study, the classified aggregates (> 5 mm, 2-5 mm, 1-2 mm, 0.25-1 mm, and < 0.25 mm) were individually incubated for 10 months under C-13-labeled maize straw application to analyze the relationship between microbial community structure in independent aggregates and inner C accumulation under straw addition. The results show that the SOC content increased in independent aggregates under straw addition, with higher stable C accumulation in < 0.25 mm than in > 2 mm aggregates. Aggregates of > 5 mm were more capable of improving unstable C accumulation and C derived from straw (C-straw) than smaller aggregates. Fungi and Gram-negative bacteria (G-) were more important to increasing C accumulation in > 2 mm aggregates, whereas Gram-positive (G+) bacteria dominated in < 2 mm aggregates. The results indicate that the contribution of microorganisms within aggregates to inner C accumulation was associated with aggregate sizes.

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