Abstract:

This paper aims to study the relationship between stand structure and productivity function,determine the rational stand structure of Chinese fir and Phoebe bournei mixed forest,and to provide the basis for maintaining the stability of community structure and improving forest productivity.With the mixed forest of Chinese fir and Phoebe bournei in Jindong Forestry Farm of Yongzhou City,Hunan Province as the research object,the coupling effects between stand structural factors such as average DBH,average height,canopy closure and mingling intensity and productivity function were analyzed by using the survey data and principal component analysis method.The coupling relationship model of stand structure and function was established,and the structure and productivity function of stand were analyzed.The results showed that the stand structure factors were closely related to productivity function.The stand with high productivity comprehensive evaluation index has the following structural characteristics:medium density (1 500 trees/hm²),canopy closure of about 0.7,and multi-layer forest structure which is conducive to maintaining better productivity function and is the best stand structure of Chinese fir-Phoebe bournei mixed forest in Jindong Forest Farm.

Key words: Chinese fir and Phoebe bournei mixed forest, stand structure, productivity function, principal component analysis, coupling