The Comprehensive Application of Fuzzy Aggregation Analysis and Ordination in the Plant Community Succession

The research on the fuzzy classification analysis and principal component analysis (PCA) in plant community succession in loess hilly region was reported, with the aim of probing into the feasibility of this method in plant community succession studying. The results showed that the 13 sample plots with 15 species were classified into 5 classes.Combined with time the restoration of different communities takes, a community succession series was established:Artemisia scoparia community-Leymus scalinus community-Stipa bungeana community-Artemisia gmelinii community-Hippophae rhamnoides community. This succession series is consistent with the results got by traditional ways, showing that these methods are applicable in the plant community succession studies. Moreover this method has strict mathematic meaning with simple calculation and high precision and can be operated in computer,thus improving the quantification of plant community succession studies. Therefore this method has high values in plant succession studies.