The dominant microorganisms vary with aggregates sizes in promoting soil carbon accumulation under straw application
文献类型： 外文期刊
作者： Lu, Jinjing 1 ; Li, Shengping 1 ; Wu, Xueping 1 ; Liang, Guopeng 4 ; Gao, Chunhua 3 ; Li, Jianhua 3 ; Jin, Dongsheng 3 ;
作者机构： 1.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China
2.Univ Liege, Fac Gembloux Agrobio Tech, B-5030 Gembloux, Belgium
3.Shanxi Agr Univ, Agr Environm & Resources Inst, Taiyuan, Peoples R China
4.Utah State Univ, Dept Biol, Logan, UT 84322 USA
5.Qingdao Agr Univ, Coll Agron, Qingdao, Peoples R China
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
年卷期：
页码：
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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