后河自然保护区水丝梨群落优势种群结构与格局

摘要/Abstract

摘要： 应用立木大小级对后河自然保护区水丝梨群落中水丝梨和曼青冈两优势种群径级结构进行了对比分析,同时采用方差/均值比的t检验法、Morisita指数I_q的F检验法、丛生指数I、负二项式指数k、平均拥挤系数m和聚块性指数m/m判定并检验了两优势种群的分布格局,并按径级分样地进行了格局类型及强度的比较.结果表明,水丝梨种群Ⅳ级占绝对优势,分别达到79.4%(Q₁)和87.4%(Q₁),Ⅰ、Ⅱ级极少甚至缺乏,更新困难,为衰退成熟型;曼青冈种群在两样地中均为Ⅰ级>Ⅱ级>Ⅲ级>Ⅳ级>Ⅴ级,为增长型.群落中两优势种群均呈集群分布;但按径级结构分析两优势种群的分布格局有所区别:随径级的增大,水丝梨种群由随机分布到集聚程度逐渐增强的集群分布,而曼青冈种群的集聚程度逐渐下降直至随机分布.

关键词: 后河自然保护区, 水丝梨, 优势种群, 种群结构, 分布格局

Abstract: Based on the investigation data of 2 quadrats (1600 m² and 2400 m²) in Houhe Nature Reserve,tree size class method was applied to analyze the structures of the dominant populations, and t-test of v/m ratio,mean crowing index, negative binomial parameter, patchiness index and Morisita index were applied to analyze the spatial distribution patterns of two dominant populations.The clumping degrees were also evaluated according to their size classes in different quadrats.The results showed that Sycopsis sinensis population was a declining population, dominated by Ⅳ trees and difficult to regenerate. In the population, the individual percentage of Ⅳ trees accounted for 79.4% in Q₁ and 87.4% in Q₂, and those of Itrees and IItrees were few. However, the population of Cyclobalanopsis oxyodon was an growing one, and the individual percentages declined with the increasing size classes. The spatial distribution patterns of the two dominant populations distributed in clumps, but the clumping degrees existed diversity. With the increase of the size classes, the clumping degree of the population of Sycopsis sinensis intensified from random to clumping distribution, while that of the population of Cyclobalanopsis oxyodon weakened from clumping to random distribution.

Key words: Houhe Nature Reserve, Sycopsis sinensis, Dominant population, Population structure, Spatial distribution pattern

中图分类号:

Q948

李新, 胡理乐, 黄汉东, 江明喜. 后河自然保护区水丝梨群落优势种群结构与格局[J]. 应用生态学报, 2003, (6): 849-852.

LI Xin, HU Lile, HUANG Handong, JIANG Mingxi. Structures and spatial distribution patterns of dominant populations in Sycopsis sinensis community in Houhe Nature Reserve.[J]. Chinese Journal of Applied Ecology, 2003, (6): 849-852.

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