A Study of Above-ground Bimass structure and the Regression Models of Three species of Fargesia in Beichuan

In order to understand the community ecology process of Fargesia and explore the carring capacity of panda habitat,studies were made of on the biomass distribution pattern of above-ground organs of three kinds of Fargesia and the regression models of each biomass component were also based on BD and culm height. The results showed that:(1) among the above-ground organs, the culm biomass was much more than the branch and leaf biomass. In the culm biomass allocation, Fargesia angustissima > Fargesia nitida > Fargesia scabrida. In the branches biomass allocation,Fargesia scabrida > Fargesia angustissima > Fargesia nitida. In the leaf biomass, Fargesia scabrida > Fargesia nitida > Fargesia angustissima. (2) Various components were highly correlated with BD. The models of fresh culm weight(W₁) based on BD of the three Fargesia species were W₁=1/7.761 + (-29.385e^-B)(Fargesia angustissima), W₁=0.367B^2.614(Fargesia nitida), W₁=1/4.804 + (-11.414e^-B)(Fargesia scabrida). According to these models the community biomass of those three Fargesia species could be accurately estimated,and thus the carrying capacity of panda habitat could also be estimated.