Study on the soil microbial diversity of different forest types in Xiaolong Mountain

The soil samples from 3 types of forest communities (Larix kaempferi, Pinus armandi and mixed forest) in Xiaolong Mountain of Gansu Province were collected to study the microbial abundance, evenness and diversity by plating method. The results showed that the soil microbial flora was greatly impacted by the forest type;and the mildew number in soil of L. kaempferi community was 1.86 times of P. armandi, but the numbers of bacteria, actinomycetes and yeast was 18.6%,18.4% and 15.0% of that in P.armandi community; the evenness of mildew community in soil of P. armandii community was poorer than that of L. kaempferi; L. kaempfer could promote the mildew number,but restrain the growth of bacteria, actinomycetes and yeast, and then affect the abundance of soil microorganisms.