Abstract: The Three Gorges Reservoir Area is located in the moist sub-tropical region. Cunninghamia lanceolata forest is one of its important vegetation types. According to the investigation, there are 8 kinds of community type of Cunninghamia lanceolata forest in the area. The vertical structure of this community is complicated, it can be divided into tree, shrub and herbaceous layers. The diversity variation among the communities is: shrub layer>herb layer>tree layer. The trend is “mid-altitude bulge” in community diversity along altitude. It might relate to the environmental factor and artificial disturbance in the research area.

Key words: alkali hydrolysable nitrogen, hyper spectra, discrete wavelet transform, genetic algorithm.