摘要
选取了方差均值比(ID)、聚集度大小指数(ICS)、Green指数(GI)、聚集频度指数(ICF)、平均拥挤度指数(IMC)、聚块性指数(IP)、Morista指数(IM)等7项指数,分析研究了桫椤种群在楠竹(Phyllostachyspupescens)和慈竹(Neosinocalamus affinis)等竹类入侵干扰下,不同层次和整体水平上的空间分布格局变化特征.结果表明,桫椤种群在幼苗阶段→小树阶段→大树阶段发展过程中,总体表现为由聚集分布逐渐向随机分布过渡,在没有竹类入侵干扰的情况下多发展为规则分布,不同竹类干扰会导致桫椤种群在各层次上的空间分布格局存在差异;在整体空间分布格局上,桫椤种群呈现随机分布,而在竹类干扰条件下,多表现为聚集分布状态.研究结果为桫椤种群的研究和保护提供理论参考.
Index of dispersion averaging, index of cluster size, Green＇ s index, index of cluster frequency, index of mean crowding, index of aggregation and Moristita＇ s index were used to analyze the spatial distribution patterns of Alsophila spinulosa population in different layers and at the integral level, The results show that the spatial distribution pattern of Alsophila spinulosa population presents clumping distribution when they are seedlings, small trees and big trees. At the phase of big tree, the Alsophila spinulos population tends to be random. The integral spatial distribution pattern of Alsophila spinulosa population in different communities also exhibits diversiform patterns. In Alsophila spinulos communities, the spatial distribution is random, but it presents clumping distribution when the communities have bamboo-invasion disturbance. The research results provide a theoretic at refrence for the study and protection of Al-sophila spinulosa poputation.
出处
《四川师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2009年第1期106-111,共6页
Journal of Sichuan Normal University（Natural Science）
基金
科技部973项目(2002CB111504)
教育部高等学校博士点专项科研基金(240-432112)资助项目
关键词
竹类入侵
桫椤种群
空间分布格局
Bamboo-invasion
Alsophila spinulosa population
Spatial distribution
