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《Journal of Glaciology and Geocryology》 2011-06
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Features of Soil Cultivable Microorganism Quantity and Diversity Distribution under Different Alpine Grassland Ecosystems in Qinghai-Tibet Plateau

CHEN Wei1 ZHANG Wei2 LI Shi-weng1 WANG Lu3 YUN Han-bai2, WU Xiu-kun2 HU Ping1 YANG Xuan1 FENG Hu-yuan3 LIU Guang-xiu2 (1.School of Chemical and Biological Engineering,Lanzhou Jiaotong University,Lanzhou Gansu 730070,China;2.Key Laboratory of Desert and Desertification,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou Gansu 730000,China;3.School of Life Sciences,Lanzhou University,Lanzhou Gansu 730000,China)  
Three representative alpine grassland ecosystems in the Qinghai-Tibet Plateau were selected to investigate the seasonal dynamics of their soil cultivable microorganisms.The results show that the amount of soil microorganism ranges from 0.4×107 CFU·g-1 to 4.6×107 CFU·g-1 and differs significantly with season.The amount of soil microorganism is the most in May in alpine sandy grassland and alpine cold swamp grassland,while is more in July in alpine-cold meadow.Based on the 16S rDNA gene sequence and phylogenetic tree,the cultivable bacteria in present study belong to 21 genera and fall into five phylogenetic groups: α-Proteobacteria,β-Proteobacteria,γ-Proteobacteria,Actinobacteria and Firmicutes,among which Actinobacteria is the predominant one.Further analysis shows that the bacteria are characterized by a taxa-area relationship.This relationship is governed primarily by environmental heterogeneity rather than geographic distance or plant composition.All these results present basic data for rationally using microbial resources and improving the Tibetan Plateau alpine grasslands.
【Fund】: 国家自然科学基金创新群体项目(40821001);国家自然科学基金项目(30800154;31170465;31100365;40971034);; 中国博士后科学基金项目(20080430794);; 甘肃省科技计划(1011FKCA114;1010RJZA009)资助
【CateGory Index】: S812
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