Study on Tsuga dumasa Community Characteristics in Lancangjiang Nature Reserve

The community characteristics of the Tsuga dumasa forest in Lancangjiang Nature Reserve were studied based on the investigation of 4 sample plots (with total area of 2 000 m²). The following results were concluded:There were 99 species and varieties of vascular plants, which belonged to 70 genera and 48 families; 8 species of pteridophytes belonging to 6 genera, 5 families; 91 species of spermatophytes belonging to 64 genera, 43 families. The dominant families that consisted of the community were Fagaceae. Orchidaceae, Theaceae, Compositae and Ericaceae. The vertical structure of the community was remarkable, which could be divided into arbor layer, shrub layer, herb layer and the interlayer.In this community, plants of micro-phanerophytes and meso-phanerophytes occupied the dominant position, accounting for 42.42%. The dominant leaf size was microphyll(30.30%), and the leaf characteristics of the community were mainly composed of simple leaf (81.82%), sclerophyll (52.54%), entire leaf (64.65%), and acuminate leaf(41.41%).It was indicated by data analyses on tree height, BHD and number of individuals of Tsuga dumasa that there was some fluctuation with the community structure.