Community assemblage of free-living diazotrophs along the elevational gradient of Mount Gongga  

作　　者：Yansu Wang Chaonan Li Zehao Shen Junpeng Rui Decai Jin Jiabao Li Xiangzhen Li 

机构地区：[1]Key Laboratory of Biotechnology for Medicinal Plants of Jiangsu Province and School of Life Sciences,Jiangsu Normal University,Xuzhou 221116,China [2]Key Laboratory of Environmental and Applied Microbiology,CAS/Environmental Microbiology Key Laboratory of Sichuan Province,Chengdu Institute of Biology,Chinese Academy of Sciences,Chengdu 610041,China [3]Department of Ecology,Ministry of Education Key Laboratory for Earth Surface Processes,Peking University,Beijing 100871,China [4]Key Laboratory of Environmental Biotechnology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China

出　　处：《Soil Ecology Letters》2019年第3期136-146,共11页土壤生态学快报（英文）

基　　金：supported by the National Natural Science Foundation of China(41771293,41630751,31670503);Chinese Academy of Sciences(XXH13503-03-106,XDB15010303);Open Fund of Key Laboratory of Environmental and Applied Microbiology CAS(KLCAS-2017-3,KLCAS-2016-03);China Biodiversity Observation Networks(Sino BON).

摘　　要：Mountain systems are unique for studying the responses of species distribution and diversity to environmental changes along elevational gradients.It is well known that free-living diazotrophic microorganisms are important to nitrogen cycling in mountain systems.However,the elevational patterns of free-living diazotrophs and the underlying ecological processes in controlling their turnover along broader gradients are less well documented.Here,we investigated the pattern of diazotrophic diversity along the elevational gradient(1800 m-4100 m)in Mount Gongga of China.The results showed that the α-diversity of diazotrophs did not change with the elevation from 1800 m to 2800 m,but decreased at elevations above 3000 m.Such diversity pattern was driven mainly by soil total carbon,nitrogen,and plant richness.Various diazotrophic taxa showed differential abundance-elevation relationships.Ecological processes determining diazotrophic community assemblage shift along the elevations.Deterministic processes were relatively stronger at both low and high elevations,whereas stochastic processes were stronger at the middle elevation.This study also suggested a strong relationship among aboveground plants and diazotrophs,highlighting their potential interactions,even for free-living diazotrophs.

关 键 词：DIAZOTROPHS Community assemblage Elevational gradient Mount Gongga 

分 类 号：Q95[生物学—动物学]