模拟增温对高寒草地土壤原核生物群落组成及多样性影响

Effects of Simulated Warming on the Composition and Diversity of Soil Prokaryotic Communities in Alpine Grasslands

全球变暖成为目前关注的热点话题,而微生物对环境变化的反馈对研究全球变暖具有重要意义,本文通过对青藏高原高寒草地土壤原核生物群落组成、多样性与环境因子进行相关性分析,研究不同的环境因子与土壤原核生物群落结构的关系,旨在揭示土壤原核生物群落与全球变暖的关系,为预测全球变暖将如何改变生态系统功能做铺垫。结果表明:温度增加会使原核生物群落α多样性和丰富度降低;模拟增温处理下土壤原核生物群落以变形菌门(Proteobacteria)、放线菌门(Actinobacteria)、酸杆菌门(Acidobacteria)、奇古菌门(Thaumarchaeota)等为主要优势菌门;模拟增温处理对原核生物群落结构没有显著的影响;铵态氮、植株高度、物种数是主要影响原核群落结构的因子。

Global warming has become a hot topic of concern at present,and the feedback of microbes to environmental changes was of great significance to the study of global warming.This article analyzed the correlation between the composition,diversity and environmental factors of soil prokaryotic communities in the alpine grasslands on the Qinghai-Tibet Plateau.The relationship between different environmental factors and the structure of soil prokaryotic communities would help to reveal how soil prokaryotic communities respond to global warming,and to pave the way for predicting how global warming will change ecosystem functions.The results showed that:Simulated warming reduced the alpha diversity and richness of the prokaryotic community;The soil prokaryotic communities under simulated warming treatment were mainly composed of the main dominant phyla of Proteobacteria,Actinobacteria,and acid.Acidobacteria,Thaumarchaeota,etc.;Simulated warming treatment had no significant effect on the structure of the prokaryotic community;Ammonium nitrogen,plant height,and the number of species were the main influencing factors affecting prokaryotic community structure.