基于分子生态学网络探究西藏草地放牧对土壤微生物群落的影响（英文）  

Molecular ecological network analyses revealing the effects of livestock grazing on soil microbial community in the Tibetan grassland

作　　者：孙欣[1] 汪诗平[2,3] 林巧燕[4] 周集中[1,5] 杨云锋[1] 

机构地区：[1]清华大学环境学院环境模拟与污染控制国家重点联合实验室,北京100084 [2]中国科学院青藏高原研究所高寒生态学和生物多样性实验室,北京100101 [3]中国科学院青藏高原地球科学卓越创新中心,北京100101 [4]中国科学院西北高原生物研究所高原生物适应与进化重点实验室,青海西宁810008 [5]Institute for Environmental Genomics and Department of Microbiology and Plant Biology,University of Oklahoma,Norman,OK 73019,USA

出　　处：《微生物学通报》2015年第9期1818-1831,共14页Microbiology China

基　　金：National Key Basic Research Program of China(No.2013CB956601,2013CB956000);National High Technology Research and Development Program of China(863 Program,No.2012AA061401);National Natural Science Foundation of China(No.41471202,41171201,41230750,41430856)

摘　　要：【目的】揭示西藏地区放牧对在功能基因层面上的微生物相互作用的影响。【方法】利用最近发明的网络工具(基于随机矩阵理论的分子生态学网络)分别在对照和放牧条件下分析基因芯片中碳循环和氮循环基因。【结果】碳和氮循环基因网络在对照和放牧条件下都具有无标度、小世界、模块性和层次性的拓扑学特征。放牧条件下的网络关键基因(模块枢纽和连通者)与对照显著不同。放牧导致网络变得小而紧密,暗示环境压力的存在。地上植物生物量与微生物基因网络显著相关(P=0.001),证实了研究样地地上植物与地下微生物紧密相连。【结论】放牧显著改变了西藏草地在功能基因层面上的微生物相互作用关系。[Objective] To unveil effects of livestock grazing in Tibet on microbial interaction at the functional gene level. [Methods] We applied a recently developed network inference tool （Random Matrix Theory-based molecular ecological network） on GeoChip data related to carbon （C） and nitrogen （N） cycling with or without livestock grazing. [Results] C and N cycling gene networks in both control and grazing conditions had topological features of scale-free, small-world, modularity and hierarchy. Key genes in the grazing networks （hubs and connectors） differed substantially from those in the control. The grazing effects on soil microbial interactions were revealed by smaller, denser networks in the grazing samples, suggestive of environmental stress. In support of close linkages between aboveground plants and microbial community at this site, aboveground plant biomass was significantly （P=-0.001） linked to grazing network topology. [Conclusion] Livestock grazing significantly altered microbial interaction at the functional gene level.

关 键 词：分子生态学网络 土壤微生物相互作用 功能基因 西藏放牧 碳氮循环 基因芯片 

分 类 号：S812.2[农业科学—草业科学]