准噶尔盆地南缘洪积扇无叶假木贼种群空间点格局

doi:10.11707/j.1001-7488.20140402

Abstract

Abstract:

Study on spatial patterns of species populations can provide many important clues about the underlying processes of these patterns formation. Natural Anabasis aphylla populations are representative vegetation types of the proluvial fan in south Junggar basin. Three sample plots were respectively established on steep slope, gentle slope and flat slope to analyze and compare spatial patterns of A. aphylla populations. The pair correlation function and univariate statistics of the point patterns were used to analyze spatial distribution of different developmental stages and different habitats, while bivariate statistics was used to analyze spatial associations of different developmental stages in each plot. The change of population spatial pattern and association among different development stages was compared to explore inherent formation mechanism of spatial patterns. The results showed that: A. aphylla populations were all aggregated distributions in the three habitats, and on steep slope and flat slope A. aphylla individuals were all aggregated at 50 m scales; Different types of A. aphylla populations on the three slopes showed significantly aggregated distributions at relatively smaller scales and the degree of aggregation decreased with increasing spatial scales, and it tended to uniform distributions at larger scales in the gentle slope; Seedlings had more obviously aggregated distribution and stronger aggregated intensity than the larger individuals; At relatively smaller scales, there was a significantly positive association among different developmental stages in the three slopes. However, at larger scales either negative or uncorrelated association was found between seedling and the other two stages, whereas positive or uncorrelated association was found between juvenile and mature plant. Among them pattern association among different developmental stages tended to negative association in the gentle slope.

Key words: Anabasis aphylla, Junggar basin, proluvial fan, g(r) function, spatial pattern, spatial association

CLC Number:

S718.54

Chu Guangming, Wang Mei, Zhang Shuoxin. Spatial Point Patters of Anabasis aphylla Populations in the Proluvial Fan of South Junggar Basin[J]. Scientia Silvae Sinicae, 2014, 50(4): 8-14.

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Spatial Point Patters of Anabasis aphylla Populations in the Proluvial Fan of South Junggar Basin

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