中文摘要：

通过对2005年和2006年东祁连山高寒草地4种不同草地类型（珠芽蓼草地、禾草草地、沼泽草地、嵩草草地）土壤3大类群微生物（真菌、细菌、放线菌）数量的时空动态进行研究。结果表明：（1）不同空间层次草地土壤3大类群微生物数量变化均较大,0-10 cm土层的数量为10-20 cm土层的1.02-3.89倍;（2）不同植被下土壤3大类微生物数量季节变化各有其自身的特点,年际变化也不一致;（3）不同植被下同一时间草地土壤三大类群微生物总数量差异较大,为0.83×10^7-4.71×10^7个/g;（4）三大类微生物中,细菌数量最大,放线菌次之,真菌最小,分别占微生物总数的48.9%-67.69%,32.18%-48.96%和0.08%-0.25%。

英文摘要：

The number and distributions of soil microorganism （fungi, actinomycete and bacteria） spatiotemporal characteristics of 4 different alpine grasslands （Polygonum grassland, Grass grassland, Swamp grassland,Kobresia grassland） in 2005 and 2006 were studied. The results obtained were as follows： （1） The quantities of microbial were different with soil depth,the number was much higher within 0-10 cm than that within 10-20 cm （1.02-3.89 times） ; （2） The distribution of microorganisms were also different from each other in different alpine grasslands with month; （3） Total number of microorganism was much different among same vegetation and it ranges from 0.83×10^7/g soil to 4.71 × 10^7/g soil. （4） Among the microorganisms,the number of bacteria is the highest （50.79%-67.69%）,then followed by actinomycete （32.18%- 48.96%） ,fungi is lowest （0.08%-0.25%）. Bacteria and actinomycete account for more than 99% of total.