林芝地区不同草地土壤微生物区系分析

通过对林芝地区3种不同类型草地（高寒草甸草地、沼泽草地和栽培草地）土壤微生物进行研究，利用稀释平板法对3种草地土壤中的细菌、真菌和放线菌进行分离。结果显示，该地区不同草地中的微生物均以细菌占优势，占微生物总数的91.2%以上，放线菌数量最少，仅占3.79%。不同类型草地微生物总数有明显差异，栽培草地>沼泽草地>高寒草甸草地；同一类型草地不同土层深度垂直动态明显，0～10 cm土层数量较多，且与10～20 cm土层微生物数量有显著差异。不同草地土壤含水量差异较大，低湿条件有利于放线菌的生长，但不利于真菌的生长。

Flora of soil microorganism in the different grassland types in the Linzhi region

The diluting plate method was used to isolate the soil bacteria,fungi and actinomycetes of alpine meadow grassland,marsh grassland and cultivation pasture in the Linzhi area.The results of this study showed that the bacteria was dominant microorganisms and accounted for 91.2%,and actinomycetes only accounted for 3.79% for each grassland type.The total microbes number was cultivation pasture>marsh grassland>alpine meadow.The amount of microorganisms at 0-10 cm soil layer was significantly greater than that at 10-20 cm soil layer.Soil moisture content in the different grassland types are very different,and low humidity conditions are advantageous to the growth of actinomycetes,but disadvantageous to fungi growth.