文献类型：期刊文献

英文题名：Stochastic processes dominated the soil bacterial community assemblages along an altitudinal gradient in boreal forests

作者：Ji, Li[1,2] Sheng, Song[1] Shen, Fangyuan[2] Yang, Lili[1] Wen, Shizhi[1] He, Gongxiu[1] Wang, Na[3,4] Wang, Xu[5] Yang, Lixue[2]

第一作者：Ji, Li

通信作者：Ji, L[1];Ji, L[2];Yang, LX[2];Wang, X[3]

机构：[1]Cent South Univ Forestry & Technol, Sch Forestry, Changsha 410004, Peoples R China;[2]Northeast Forestry Univ, Sch Forestry, Key Lab Sustainable Forest Ecosyst Management, Minist Educ, Harbin 150040, Peoples R China;[3]Hengyang Normal Univ, Hunan Prov Key Lab Funct Met Organ Cpds, Hengyang 421008, Peoples R China;[4]Hengyang Normal Univ, Coll Life Sci & Environm, Hengyang 421008, Peoples R China;[5]Chinese Acad Forestry, Res Inst Trop Forestry, Guangzhou 510520, Peoples R China

年份：2024

卷号：237

外文期刊名：CATENA

收录：;Scopus(收录号：2-s2.0-85182576612);WOS:【SCI-EXPANDED(收录号:WOS:001325818600001)】；

基金：This work was financially supported by the Science and Technology Program of Changsha City (kq2208416) , the Scientific Research Project of Hunan Provincial Education Department (21B0642) , the Natural Science Foundation of Hunan Province (2022JJ40012) , and the Na-tional Key Research and Development Program of China (2017YFD0601204) . We thank Lixin Ma, Qingchao Zhu and the A'longshan Forestry Bureau for access permission and logistic support. We also thank Chengfeng Shan, Jiangbo Yu, Yan Zhang and Yujiao Wang for assistance in laboratory analyses.

语种：英文

外文关键词：Altitude; Community assembly; Functional composition; Soil bacteria; Boreal forest; Stochasticity

摘要：Soil bacteria, as integral components of the soil microbial community, play pivotal roles in biogeochemical cycles and ecosystem functions in boreal forests. The altitudinal patterns of soil bacteria have been widely reported, but their community assembly is uncertain. Here, we investigated the soil bacterial community attributes (diversity, taxonomic and functional composition, and bacterial interactions) and ecological processes associated with community assembly on Mt. Oakley in the northern Greater Khingan Mountains via Illumina MiSeq sequencing and functional annotation tools. The alpha diversity indices of the soil bacteria exhibited a progressively decreasing trend with increasing altitude across seasons. The relative abundance of the dominant bacterial taxa was more sensitive to altitude than to season. More complex (more nodes and links) bacterial interactions were detected at the lowest and highest altitudinal sites, as well as in September. The variations in the taxonomic and functional compositions of the soil bacteria induced by altitude were mainly driven by the variations in soil pH and extracellular enzyme activities. Stochastic (dispersal limitation and drift) processes largely controlled the soil bacterial community assemblages across spatiotemporal scales. The community assemblages of soil bacteria were affected by altitude-induced changes in the taxonomic composition and functional groups. Collectively, our results have significant implications for understanding bacterial biogeography and community assembly mechanisms along altitudinal gradients in boreal forest ecosystems.