Title: Point pattern analysis of Seriphidium transiliense populations under two degradation gradients in the Northern Tianshan Mountains
Abstract: Ripley's K function was used to analyse spatial patterns and association of S.transiliense populations in severe and extreme degradation regions.In a 20 m series spatial scale,the S.transiliense population was usually characterized by nonrandom(clumped) distribution in a seriously degraded region.The intensity was different and showed a clumped wave phenomenon on a different scale.The S.transiliense population was usually characterized a by distribution on a small-scale in an excessively degraded region,but when it reached the threshold of the distribution,then it shifted to a random distribution.Analysis of the spatial association of two sizes of S.transiliense showed that the size 2 individuals had a distribution in seriously degradation regions,but the intensity of the larger individuals was weaker.The size 1 had a small-scale distribution in the badly degradation region,with a shift to random or regular distribution with increase of the spatial scale.Size 2 had a random distribution.According to spatial association analysis,the two sizes of S.transiliense populations had a positive small-scale association in two degradation gradients,but the association waned with an increase of scale,and the scope of the scale was different when the two sizes of populations represent a positive association.
Publication Year: 2009
Publication Date: 2009-01-01
Language: en
Type: article
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Cited By Count: 3
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