Edaphic variables are better indicators of soil microbial functional structure than plant-related ones in subtropical broad-leaved forests

文献类型： 外文期刊

第一作者： Cheng, Jingmin

作者： Cheng, Jingmin;Yu, Jingjing;Zhao, Mengxin;Zhang, Yuguang;Cheng, Jingmin;Zhao, Mengxin;Cheng, Jingmin;Zhou, Jizhong;Han, Zhongjie;Cong, Jing;Zhou, Jizhong;Zhou, Jizhong;Zhou, Jizhong

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关键词： Environmental variables; Network analyses; Functional genes; GeoChip; Subtropical broad-leaved forests

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：6.551； 五年影响因子：6.419 ）

ISSN： 0048-9697

年卷期： 2021 年 773 卷

页码：

收录情况： SCI

摘要： Soil microorganisms play important roles in the ecosystem functioning of subtropical broad-leaved forests (SBFs). However, the patterns and environmental indicators of soil microbial functional structure remain unclear in SBFs. In the present work, we used a functional microarray (GeoChip 4.0) to examine the soil microbial functional structure of three types of SBFs, including a deciduous broad-leaved forest (DBF), a mixed evergreen-deciduous broad-leaved forest (MBF), and an evergreen broad-leaved forest (EBF). We found that microbial functional structure was significantly different among SBFs (P < 0.05). Compared to the DBF and the EBF, the MBF had higher functional a-diversity (P= 0.001, F= 12.55) but lower beta-diversity (P < 0.001, F= 61.09), and showed more complex functional gene networks. Besides, the MBF had higher relative abundances of functional genes for carbon (C) decomposition, C fixation, nitrogen (N) cycling, sulfur (S) cycling, and phosphorus (P) cycling (P < 0.05), indicating stronger microbial functional capabilities of nutrient cycling processes. Edaphic variables (i.e., soil pH and soil nutrient content) were revealed as better indicators of soil microbial functional structure than plant-related ones (i.e., vegetation type and plant diversity) in SBFs. For example, functional gene structure of the DBF was significantly related to soil total S (P = 0.041), that of the MBF was significantly related to soil organic C (P = 0.027) and plant available P (P = 0.034), and that of the EBF was significantly related to soil pH (P = 0.006) and total potassium (K) (P = 0.038). Overall, through the analysis of microbial functional gene profiles, this study yields unique insights into the environmental indicators of patterns and mechanisms of soil microbial functional structure in SBFs. (C) 2021 Published by Elsevier B.V.

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