塔克尔莫乎尔沙漠银沙槐(Ammodendron argenteum)群落主要种群的分布格局

摘要/Abstract

摘要： 根据野外调查的样地数据,应用扩散系数、聚集指数、平均拥挤度、聚块性指数、Green指数、聚集强度、Poisson分布和负二项分布的x²拟合检验等方法,研究银沙槐(Ammodendron argenteum)群落主要种群的分布格局及其形成的原因,并用相关分析比较了6个指数间的关系。结果表明:银沙槐及其群落内的主要种群分布格局皆为聚集型,各种群聚集程度存在差异,这主要与物种本身以种子来实现扩散和繁殖的生物学特性以及沙漠严酷生境中养分、水分的空间异质性导致的群落生态过程空间非同步性有关,也与物种适应沙漠环境的共同生态习性密切相关。判定种群分布格局的6种指数方法虽然都表征出较一致的生态学意义,但还需要结合分布格局概率模型的显著性检验,即进行Poisson分布和负二项分布的x²拟合优度检验相互印证,以便更好地确定种群空间分布格局类型。

关键词: 银沙槐(Ammodendron argenteum), 种群, 分布格局, 塔克尔莫乎尔沙漠, 伊犁, 新疆

Abstract: In this paper, it is attempted to probe into the patterns of main populations of Ammodendron argenteum communities and their affecting factors in Takeermohuer Desert based upon the data collected through field work in sample plots. The dispersal index, clump intensity, mean crowding, patch index, Green index, intensity index, fitting test of Poisson distribution and negative binomial distribution were used in the study. The distribution patterns and affecting factors of the main populations of A. argenteum communities were researched, and the relations among the six indexes were analyzed with correlation analysis. The results revealed that the distribution patterns of the main populations of A. argenteum communities were all clumped, and there was a difference in clump intensity. Moreover, the distribution patterns were closely related to the biological habits of the main populations diffused and bred by seeds, also to the spatial asynchronization of the main populations of the community ecology induced by spatial asymmetry of nutrient and soil moisture content in the severe desert, and the common ecological habits of the populations adapted for the desert environment. A certain ecological significance was characterized by the six exponential methods, and a mutual corroboration of the χ² test for Poisson distribution and negative binomial distribution was carried out so as to determine the spatial distribution patterns of the main populations of A. argenteum communities well.

Key words: Ammodendron argenteum, community, population, distribution pattern, Takeermohuer Desert, Yili, Xinjiang

李进, 黄力平, 吕海英, 王孝安. 塔克尔莫乎尔沙漠银沙槐(Ammodendron argenteum)群落主要种群的分布格局[J]. 干旱区研究, 2013, 30(4): 634-639.

LI Jin, HUANG Li-ping, LV Hai-ying, WANG Xiao-an. Distribution Patterns of Main Populations of Ammodendron argenteum Communities in the Takeermohuer Desert[J]. Arid Zone Research, 2013, 30(4): 634-639.

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