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中文摘要：
以青藏高原北麓河不同类型草地生态系统下土壤为研究对象,研究了可培养细菌数量和多样性的季节性变化.结果显示研究区域可培养细菌数量为0.4×107～4.6×107 CFU.g-1,不同类型草地生态系统下可培养细菌具有明显的季节差异：高寒沼泽草甸和高寒沙化草原生态系统下土壤细菌在5月生物量最高,而高寒草甸生态系统下在7月有最高的生物量;可培养细菌分属于α-变形菌（α-Pro-teobacteria）,β-变形菌（β-Proteobacteria）,γ-变形菌（γ-Proteobacteria）,放线菌门（Actinobacteria）,厚壁菌门（Firmicutes）5个类群,其中放线菌门为优势类群.不同类型草地生态系统有不同的细菌多样性特征,表明这种细菌多样性变化与相邻区域的差异性符合物种-区域关系,说明随着高山草原的退化,青藏高原各高山草地生态系统间已产生较大的环境异质性,而这种异质性进一步影响到了物种的多样性.结果为利用微生物综合评价高山草地的生态环境,并合理利用微生物资源改良青藏高原高山草原提供了数据基础及特有的微生物资源.
英文摘要：
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.
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