Structures and spatial distribution patterns of dominant populations in Sycopsis sinensis community in Houhe Nature Reserve.

Abstract

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

CLC Number:

Q948

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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