贵阳喀斯特山地云贵鹅耳枥种群结构和动态初探

A PRELIMINARY STUDY ON THE STRUCTURE AND DYNAMICS OF PUBESCENT HORNBEAM POPULATION IN KARST MOUNTAIN OF GUIYANG

本文对贵阳喀斯特山地云贵鹅耳枥种群结构和动态进行了探讨。结果表明:(1)云贵鹅耳枥种群大小结构分初始增长型、增长型、稳定型、始衰型、中衰型、老衰型和偏途顶极型等7种类型,并呈现由初始增长型过渡到老衰型的变化;(2)云贵鹅耳枥种群分布格局呈集群型和随机型,分布格局的变化有一定的规律性,即种群在其散布和发展阶段多趋于集群型,而在其衰退阶段趋于随机型;(3)云贵鹅耳枥种群密度随时间变化呈现负增长;(4)云贵鹅耳枥种群是先锋种群,但在裸岩陡坡等特殊生境中亦能形成稳定的群落。

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.