不同人工林树种对土壤微生物群落结构和酶活性的影响

By using fumigation extraction ,phospholipid fatty acid (PLFA) andmicrowell platemethods，this paper studied the quantities of soil microbial communitystructure and function under plantations of six-different tree species in subtropical China. The results showed that, Schima superba forest soil microbial biomass and phospholipid fatty acids content were the highest and significantly higher than that of nitrogen fixation trees (Acacia mangium and Acacia confusa Merr). Fungal PLFAs measure and bacterial PLFAs is highest under Schima superba and Fokienia hodginsii forest, significantly higher than that of two kinds of nitrogen fixation trees. Principal components explained 58% of the microbial community structure variation and show stand significantly affected the microbial community structure. Four kinds of soil enzyme activity of Acacia mangiumsignificantly higher than that of other forest, showed that forest types have significant influence on soil enzyme activity.Correlation analysis showed that stand between the microbial biomass is mainly under the influence of soluble organic nitrogen and total nitrogen in soil; Soil water content, soil carbon, nitrogen and mineral nitrogen and soluble organic carbon are important influence on soil enzyme activity.