Classification and Ordination of Plant Community in the Maotai Water Functional District

To provide theoretical basis for the plant ecological protection and the structural adjustment of plant community in later period,the ecological relationships between plant communities and environment,as well as species and environment were analyzed,using TWINSPAN classification and DCA ordination,based on 57 typical plant community quadrates in the Moutai water functional district.The results showed that: 1) The plant communities were classified into 11 association types by TWINSPAN classification,and they were further verified in the DCA two-dimensional ranking diagram.2) The DCA ordination indicated that soil moisture and slope direction were the dominate factor of the plant community distribution.3)The main ecological factors which affected the distribution of plant were soil moisture,light intensity according to the plant DCA sequencing result,and the diagonal line of ordination diagram of DCA indicated the substitution relation of species which exposited that there was great similarity between the distribution of species and plant communities.