An analysis of the number and biomass of microbe and the activity of enzymes in different decomposed states of cattle dung has been carried out for Inner Mongolia typical steppe. The order of total microbial number was DD(16. 2 × 1O6 cfu · g-1)＞ NDD( 7. 6 × 1O6 cfu · g-1) ＞ SDD( 6. 6 × 1O6 cfu · g-1 ).The number of bacteria, fungi and actinobacteria were the highest in decomposed, semi-decomposed and non-decomposed cattle dung,respectively. The contents of microbial biomass C and N were the highest in semi-decomposed cattle dung. But the content of microbial biomass P was the highest in decomposed cattle dung. Higher activities of urease and cellulose occurred in semi-composed cattle dung. And the protease activity was the highest in non-decomposition cattle dung. The results show that the features of microbial number and enzyme activities were difference in 3 kinds of cattle dung. C and N turnover activities, cellulose and protease activities were high in semi-decomposed cattle dung. And P turnover activity was high in decomposed cattle dung.%分析了内蒙古典型草原上未腐解、半腐解和腐熟牛粪中的微生物数量、微生物生物量和酶活性特征.结果表明:不同分解状态牛粪中微生物总数的大小次序为腐熟牛粪＞未腐解牛粪＞半腐解牛粪;腐熟牛粪中的细菌数量最高,半腐解牛粪中的真菌数量最高,未腐解牛粪中的放线菌数量最高;微生物生物量碳和氮的质量分数均为半腐解牛粪中最高,微生物生物量磷的质量分数为腐熟牛粪中最高;半腐解牛粪中有较高的纤维素酶和蛋白酶活性,脲酶活性则在未腐解牛粪中最高.这表明不同分解状态牛粪具有不同的微生物和酶活性特征,半腐解牛粪具有较高的碳氮转化活性及纤维素酶和蛋白酶活性,而磷转化活性则在腐熟牛粪中较高.
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