[Age structure and dynamics of Keteleeria davidiana var. chien-peii population in Guizhou Province]

Type and dynamics of age structure of Keteleeria davidiana var. chien-peii population and its relationship to community succession and environment were analyzed. The results showed that the age structures were classified into four types:growing, stable, initial and middle sensecent types. The survival curves had concave, convex, disconnected and dotted shapes. Along with development and succession of community, the age structure changes from growing, stabilized, senescent to residual type. The important factors causing change to the age structure were biological features of Keteleeria davidiana var. chien-peii, development of broad-leaved tree species, geographic isolation, and human disturbance.