A PRELIMINARY STUDY ON THE STRUCTURE AND DYNAMICS OF PUBESCENT HORNBEAM POPULATION IN KARST MOUNTAIN OF GUIYANG
贵阳喀斯特山地云贵鹅耳枥种群结构和动态初探

This paper deals with the structure and dynamics of pubescent hornbeam population in karst mountain of Guiyang.The results are as follows. 1.The size structures are classified into seven types,initial gr- owing,growing,stational,initial senescent,middle senescent,fin- al senescent and disclimax types.Along with the population and the succession development,the size structure changes mainly from gr- owing,senescent,extremely senescent to residual type. 2.The spatial patterns of the populations are contagious type and random type.Spatial pattern changes with size classes of the po- pulation.It was found that the seedling,sapling and small tree cla- sses show contagious types,while the middle and large tree classes exhibit random types.The regularity reflects the dynamic change of spatial pattern with time in development of the population. 3.The population density tends to decrease with the population and the succession development. 4.Pubescent hornbeam population is a pioneer of the karst for- est succession on Chinese subtropics,and occurs throughout the su- ccession.But the population at rocky steep slopes or ridges may de- velope into stationary community.