Abstract:In order to understand the regeneration mechanism of Fagus lucida forest in Kuankuoshui Nature Reserve, Guizhou, the effect of Chimonobambusa utilis on population structure of F. lucida was studied by quadrat method. The results showed that the high density of C. utilis reduced the number of F. lucida population, the number of F. lucida showed decline trend along increment of diameter and height classes. The density increase of was in favor of F. lucida saplings from small diameter class to middle diameter class, which decline was good for saplings from middle diameter class to big diameter class. The high density of C. utilis reduced mean DBH (diameter at breast height) of F. lucida saplings, and increased mean height. Therefore, C. utilis could affect the quantitative structure and morphogenesis of F. lucida saplings, while F. lucida adapted to C. utilis clump environment by reducing DBH and increasing height.