From structure to assembly processes:how salinity regulates soil bacterial communities in arid regionsOA
Although salinity functions as a key environmental filter for soil microorganisms,its comprehensive effects on soil microbial community structure and assembly processes remain poorly understood,particularly in arid regions prone to salinization.In this study,soil bacterial communities along a natural salinity gradient at the edge of Ebinur Lake in Northwest China were investigated.Using 16S ribosomal RNA(16S rRNA)sequencing,we examined variations in soil bacterial community structure,co-occurrence patterns,and assembly mechanisms across different soil salinity groups,including lightly salinized soils(LSS),moderately salinized soils(MSS),and heavily salinized soils(HSS).The results showed that soil bacterial diversity varied significantly among salinity groups,with the highest value observed in LSS.Community dissimilarity increased notably with greater variations in salinity.Notably,a systematic shift in soil bacterial composition occurred along the salinity gradient,with salt-sensitive bacterial phyla(e.g.,Acidobacteria and Gemmatimonadetes)being progressively replaced by salt-tolerant ones(e.g.,Firmicutes and Bacteroidetes).Network analysis underscored that increased salinity led to reduced soil bacterial network complexity and stability.More positive correlations among soil bacteria occurred in HSS,suggesting a potential shift toward cooperative microbial strategies under severe salt stress.Moreover,the assembly processes governing soil bacterial communities transitioned from stochastic process,predominantly in LSS(71.43%)and MSS(80.00%),to deterministic process in HSS(66.66%).In summary,the results emphasize the multifaceted role of soil salinity in shaping soil bacterial communities in arid ecosystems,thereby enhancing the understanding of the impacts of soil salinization on soil microbial dynamics.
MOU Na;ZHANG Yu;MA Jie;LIU Ran;XU Guiqing
Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China University of Chinese Academy of Sciences,Beijing 100049,China Fukang National Field Scientific Observation and Research Station for Desert Ecosystems,Fukang 831505,ChinaKey Laboratory of Ecological Safety and Sustainable Development in Arid Lands,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China University of Chinese Academy of Sciences,Beijing 100049,China Fukang National Field Scientific Observation and Research Station for Desert Ecosystems,Fukang 831505,ChinaKey Laboratory of Ecological Safety and Sustainable Development in Arid Lands,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China Fukang National Field Scientific Observation and Research Station for Desert Ecosystems,Fukang 831505,ChinaKey Laboratory of Ecological Safety and Sustainable Development in Arid Lands,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China Fukang National Field Scientific Observation and Research Station for Desert Ecosystems,Fukang 831505,ChinaKey Laboratory of Ecological Safety and Sustainable Development in Arid Lands,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China Fukang National Field Scientific Observation and Research Station for Desert Ecosystems,Fukang 831505,China
农业科技
salinitysoil bacteriabacterial community structureco-occurrence networkcommunity assemblyEbinur Lake
《Journal of Arid Land》 2026 (8)
P.1462-1479,18
supported by the Chinese Academy of Sciences Western Light Talent Training Program(2022-XBQNXZ-004)the National Natural Science Foundation of China(42371068)the Tianshan Talent Program of Xinjiang Uygur Autonomous Region(2022TSYCCX0002)the Key Research and Development Program of Xinjiang Uygur Autonomous Region(2024B02015-2)。
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