Climate warming suppresses abundant soil fungal taxa and reduces soil carbon efflux in a semi-arid grassland  

作　　者：Yunpeng Qiu Kangcheng Zhang Yunfeng Zhao Yexin Zhao Bianbian Wang Yi Wang Tangqing He Xinyu Xu Tongshuo Bai Yi Zhang Shuijin Hu 

机构地区：[1]College of Resources and Environmental Sciences,Nanjing Agricultural University,Nanjing,China [2]Ningxia Yunwu Mountains Grassland Natural Reserve Administration,Guyuan,China [3]State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi'an,China [4]Research Center for Advanced Science and Technology,The University of Tokyo,Tokyo,Japan [5]Department of Entomology&Plant Pathology,North Carolina State University,Raleigh,North Carolina,USA

出　　处：《mLife》2023年第4期389-400,共12页微生物（英文）

基　　金：supported by National Natural Science Foundation of China (NSFC) (Nos.32371626 and 32001140);China Postdoctoral Science Foundation (No.2022T150325).

摘　　要：Soil microorganisms critically affect the ecosystem carbon(C)balance and C-climate feedback by directly controlling organic C decomposition and indirectly regulating nutrient availability for plant C fixation.However,the effects of climate change drivers such as warming,precipitation change on soil microbial communities,and C dynamics remain poorly understood.Using a long-term field warming and precipitation manipulation in a semi-arid grassland on the Loess Plateau and a complementary incubation experiment,here we show that warming and rainfall reduction differentially affect the abundance and composition of bacteria and fungi,and soil C efflux.Warming significantly reduced the abundance of fungi but not bacteria,increasing the relative dominance of bacteria in the soil microbial community.In particular,warming shifted the community composition of abundant fungi in favor of oligotrophic Capnodiales and Hypocreales over potential saprotroph Archaeorhizomycetales.Also,precipitation reduction increased soil total microbial biomass but did not significantly affect the abundance or diversity of bacteria.Furthermore,the community composition of abundant,but not rare,soil fungi was significantly correlated with soil CO_(2) efflux.Our findings suggest that alterations in the fungal community composition,in response to changes in soil C and moisture,dominate the microbial responses to climate change and thus control soil C dynamics in semi-arid grasslands.

关 键 词：climate warming microbial diversity precipitation reduction soil carbon dynamics 

分 类 号：S154.3[农业科学—土壤学]