Soil Microbial Community Structure Diversity in Castanopsis kawakamii Forest

Phospholipid fatty acid (PLFA) method is used to study the soil microbial diversity in Castanopsis kawakamii forest. The results showed that 33 PLFA markers were detected with a total of 211053 μg/g. There had the biggest PLFA markers(26) party at the junction of natural and plantation forest(NPF), the next was natural mixed forest of C.kawakamii and Pinus massoniana(NF2)(23), monoculture plantations of Castanopsis kawakamii (CK)(19) and natural mixed forest of C.kawakamii and Schima superba (NF1)(18). The sort of total PLFA in these four sites was: NF2(（7271±1476）μg/g)＞CK(（4950±487）μg/g)＞NF1(（4643±577）μg/g)＞NPF(（4241±807）μg/g). Using dominant PLFAs to calculate the environmental adaptability indexes and getting the following results: Bacteria/fungi (B/F) was 4942, gram positive bacteria/gramnegative (G+/G) bacteria was 1865, soil microbial pressure index (cy17∶0/16∶1ω7c) was 0287. These indexes revealed that the soil circulation system had strong pressure feedback ability. Principal component analysis (PCA) explains why the variation PLFA of was 8743%. The results showed that the soil microbial community structure had strong regional distribution characteristics.