Regulation of soil aggregate size under different fertilizations on dissolved organic matter, cellobiose hydrolyzing microbial community and their roles in organic matter mineralization

文献类型： 外文期刊

第一作者： Xu, Peidong

作者： Xu, Peidong;Zhu, Jun;Shi, Lei;Zhuang, Yi;Fu, Qingling;Chen, Jiazhou;Hu, Hongqing;Huang, Qiaoyun;Wang, Hui

作者机构：

关键词： Soil aggregates; Mineralization of organic matter; Dissolved organic matter; Cellobiose hydrolyzing microbial community

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）

ISSN： 0048-9697

年卷期： 2021 年 755 卷

页码：

收录情况： SCI

摘要： The mineralization of soil organic matter is closely related to climate change. Labile organic matter and microbial community are vital intrinsic factors in controlling the mineralization of soil organic matter. Regulation of soil aggregate size on dissolved organic matter (DOM), the cellobiose hydrolyzing microbial community, and their roles in organic matter mineralization remains unclear. The mineralization of organic matter in large macroaggregates (LMA, >2 mm), small macroaggregates (SMA, 0.25-2 mm), and microaggregates (MI, <0.25 mm) from an Ultisol treated with long-term non-fertilizers (Ck), chemical fertilizers (NPK) and animal manure (AM) was observed in this study. The concentration and structure of DOM, activity of beta-glucosidase, and the abundance, diversity, and community composition of GH1 (glycoside hydrolase family 1) microbial beta-glucosidase encoding genes were investigated. The cumulative CO2-C emissions occurred in the order LMA < SMA < MI in each fertilization treatment and followed the sequence Ck < NPK < AM in each size of aggregate. The concentration of DOM in the soil aggregates increased as the aggregate size decreased, while the structural complexity of DOM followed the opposite trend. The activity of beta-glucosidase in the smaller aggregates was higher than that in the larger aggregates, and the abundance and diversity of the GH1 microbial ss-glucosidase genes generally echoed the same trend. The dominant microbial classes harboring GH1 beta-glucosidase genes in the soil aggregates were Actinobacteria, Alphaproteobacteria, Gammaproteobacteria, Flavobacteria, Eurotiomycetes, and Sordariomycetes. The relative abundance of Actinobacteria, Sordariomycetes, and Eurotiomycetes revealed significant differences among the aggregates. Redundancy analysis confirmed that microbial GH1 beta-glucosidase community in the soil aggregates was primarily regulated by DOM concentration and pH. Structural equation modelling revealed that soil aggregates mainly regulated the beta-glucosidase activity and DOM concentration and then the abundance and diversity of the GH1 microbial beta-glucosidase genes in controlling organic matter mineralization. (C) 2020 Elsevier B.V. All rights reserved.

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