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LIN Kaimin,YU Xintuo,HUANG Baolong1 & HE Zhiying (Chinese Fir Research Centre of Fujian Forestry College,Nanping 353001, China) (1Resource and Environment College of Nanjing Forestry University,Nanjing 210037, China)  
The dynamic characterristics of succession process of undergrowth plants in different aged Chinese fir plantations were studied.The results showed that in accompanying stage of accidental species,undergrowth plant species and quantities flourished first,and the structure was very simple. In sparse stage of undergrowth plants, species and quantities were few,and structure was simple. In relatively stable stage of undergrowth plants,species and quantities increased, and Chinese fir community formed stable 3-layer structure including Chinese fir layer,shrub layer and herb layer. In invading succession stage of undergrowth plants, species composition and quantities flourshed again,some broad-leaved tree species started to grow into tree layer,and the multi-species and multi-layer community structure was formed. The α diversity indexes of undergrowth plants were obviously different and fluctuated. The richness index, diversity index and evenness index of total undergrowth plants of shrub layer were higher in young Chinese fir plantation. In the stage of closed forest stand, all indexes obviously decreased, then increased again, reaching maximal value in old-growth plantation. Vertical structure of species diversity showed shrub layerherb layerliana plant in 3,9 and 31 year-old plantations, in 20 year-old plantation, herb layershrub layerliana plant, and in old-growth Chinese fir plantation, shrub layertree layerliana plantherb layer. Tab 3, Ref 6
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