Keystone microbial taxa drive the accelerated decompositions of cellulose and lignin by long-term resource enrichments

文献类型： 外文期刊

第一作者： Song, Alin

作者： Song, Alin;Zhang, Jiayin;Wang, Enzhao;Bi, Jingjing;Asante-Badu, Bismark;Njyenawe, Marie Claire;Sun, Miaomiao;Xue, Piao;Wang, Sai;Fan, Fenliang;Xu, Duanyang;Fan, Fenliang

作者机构： Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Key Lab Plant Nutr & Fertilizer, Minist Agr, Beijing 100081, Peoples R China;Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China;Zhongguancun St 12, Beijing 100081, Peoples R China

关键词： Long -term fertilization; DNA -SIP; Cellulose; Lignin; Decomposition

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 2021影响因子：10.753； 五年影响因子：10.237 ）

ISSN： 0048-9697

年卷期： 2022 年 842 卷

页码：

收录情况： SCI

摘要： Lignin and cellulose are the most important component of crop straw entering arable soil. The decomposition of lignin and cellulose are related to carbon sequestration and soil fertility. The keystone microbes decomposing lignin and cellulose in cropland and their impact on agricultural management, however, remains largely unclear. In this study, we traced the carbon (C) from highly enriched C-13-labeled (atom% C-13 = 99 %) lignin and cellulose to functional key-stone microbes in soils of a 26-year fertilization field experiment with stable isotope probing (SIP). 13C-cellulose and 13C-lignin decomposition were significantly accelerated with the long-term application of fertilization, especially with the combination of organic and chemical fertilization (NPKM). The 13C was mainly assimilated by bacteria Acidobacteria (i.e. GP1, GP3, GP6), Proteobacteria (i.e. unidentified gamaproteobactiera, Bradyrhizobium), and fungi As-comycota (i.e. Talaromyces and Fusarium, etc.). The keystone bacteria taxa decomposing cellulose and lignin were large overlapped, but substantially shaped by fertilization. For instance, GP3 was the dominant bacterium that decomposed both cellulose and lignin in no fertilizer control (CK), while GP1 and GP6 were the ones in chemical fertilization (NPK) and NPKM, respectively. The decomposition rates of cellulose in different fertilizations were majorly predicted by soil total phosphorus (TP), functional fungi abundance, total nitrogen (TN), whereas functional bacterial and fungal abundance, TP, and community structure of functional fungi manipulated the decomposing rate of lignin. Together, we demonstrate that keystone functional microbes decomposing cellulose and lignin were largely concurring and signif-icantly altered by long-term resources enrichment, which drives the similar patterns of decomposition rates of these two substrates along the resource enrichment gradient.

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