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

[en] 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 13C-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 (Cstraw) 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. © 2021 Informa UK Limited, trading as Taylor & Francis Group.

Disciplines :

Agriculture & agronomy

Author, co-author :

Lu, Jinjing ; Université de Liège - ULiège > TERRA Research Centre

Li, Shengping ; Université de Liège - ULiège > TERRA Research Centre

Wu, X.; Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China

Liang, G.; Department of Biology, Utah State University, Logan, UT, United States

Gao, C.; Agricultural Environment and Resources Institute, Shanxi Agricultural University, Taiyuan, China

Li, J.; Agricultural Environment and Resources Institute, Shanxi Agricultural University, Taiyuan, China

Jin, D.; Agricultural Environment and Resources Institute, Shanxi Agricultural University, Taiyuan, China

Wang, B.; College of Agronomy, Qingdao Agricultural University, Qingdao, China

Zhang, M.; Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China

Zheng, F.; Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China

Degré, Aurore ; Université de Liège - ULiège > Département GxABT > Echanges Eau - Sol - Plantes

Language :

English

Title :

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

Publication date :

2021

Journal title :

Archives of Agronomy and Soil Science

ISSN :

0365-0340

eISSN :

1476-3567

Publisher :

Taylor and Francis Ltd.

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 06 January 2022

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