增温和施氮对无芒隐子草非根际、根际及根鞘 土壤细菌群落的影响

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中图分类号：S812.2 文献标识码：A 文章编号：1007-0435（2025）05-1345-10

Abstract：To explore the changes of non-rhizosphere，rhizosphere and rhizosheath soil bacterial communities of grasland plant under the background of climate warming and increased nitrogen deposition，high-throughput sequencing analysis of non-rhizosphere，rhizosphere and rhizosheath soil bacterial communities of the dominant grass Cleistogenes songorica （Roshev.） Ohwi was performed based on the long-term warming and nitrogen addition experimental platform in the desert steppe of Inner Mongolia.The results showed that the relative abundance of Gemmatimonadetes in the rhizosphere and rhizosheath soil was significantly increased by warming and nitrogen addition，while the relative abundance of Acidobacteria decreased.There was no significant diference on bacterial diversity in the non-rhizosphere，rhizosphere and rhizosheath soil. Compared to non-rhizosphere soil，the Shannon-Wiener index of rhizosphere and rhizosheath soil bacterial communities was decreased by 3.06% and 3.27% ， respectively. Warming and nitrogen addition reduced the network complexity and stabilityof soil bacteria，and the network complexityand stabilityof soil bacteria variedat diferent distances from roots.In conclusion，the composition，diversity and network complexity of soil bacterial communities in the non-rhizosphere，rhizosphere and rhizosheath of Cleistogenes songorica had diferent responses to climate change.Future studies on the efects ofclimate change on soil microbes in grassands should distinguish the differences of soil microbes at diferent distances from plant roots.This willead to a deeper understanding of the interactions between plants and soil microbes and their adaptability to climate change.

Key words：Climate change; Cleistogenes songorica;Rhizosphere; Rhizosheath;Microbial network

全球气候变暖和大气氮沉降加剧是全球变化的重要驱动因子，能够影响草地生态系统的生物地球化学循环和功能[1-2]。（剩余14199字）