黔灵山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 QIANLINSHAN MOUNTAIN

本文对黔灵山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为初始增长型、增长型、稳定型和衰退型4种类型;(2)云贵鹅耳枥种群分布格局呈集群型和随机型;(3)云贵鹅耳枥种群密度随着时间的变化呈现负增长;(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 Qianlinshan Mountain. The results are as follows: (1) The size structures are classified into four types such as initial growing, growing, stational and senescent type. With the population and the succession development, the size structure changes mainly from initial growing and growing to senescent type. (2) The spatial patterns of the population are contagious type and random type. Spatial pattern alters with different size classes of the population. It is found that the seedling, sapling, and small tree classes show contagious types, while the middle and large tree classes exhibit random types. The regularity reflects the dynamic change of spatial pattern with the time of the development of the population. (3) The population density tends to negativc increasment, along with the population and the saccesion development. (4) Pubescent hornbeam population is a pioneer one of the karst forest succesion in Chinese subtropics, and occurs throughout the succesion. But the population at rochy slopes or ridges may develop into stationary community.