塔里木河流域荒漠河岸林胡杨群落的空间格局研究

摘要/Abstract

摘要： 以塔里木河流域荒漠河岸林胡杨群落为研究对象,研究优势种胡杨与灰胡杨种群径级结构、空间分布格局与空间关联性。结果表明,胡杨和灰胡杨种群径级结构均呈倒金字塔型,属衰退型种群。胡杨种群在1～25 m尺度内呈聚集分布,灰胡杨种群在2～23 m尺度内呈聚集分布,胡杨种群聚集强度大于灰胡杨。随种群生长发育,胡杨和灰胡杨聚集尺度范围及聚集规模逐渐减弱,大树趋于随机分布。灰胡杨不同生长阶段在0～25 m空间尺度上相互独立,胡杨小树与中树在5～10 m空间尺度上相互依存。胡杨中树与灰胡杨中树在大尺度空间(＞23 m)上相互排斥; 胡杨与灰胡杨种群在小尺度空间(2～3 m)上相互依存,中尺度空间上相互独立。

关键词: 荒漠河岸林, 种群结构, 点格局分析, 空间格局, 空间关联

Abstract: The diameter at breast height (DBH) size structures, spatial patterns and spatial correlation of Populus euphratica and Populus pruinosa populations of desert riparian forest along the Tarim river were studied. The results show that the DBH size structures of P.euphratica and P.pruinosa populations are inverted pyramid shape, and it indicates they belong to declining populations. Ripleys K-function analysis indicates that the two populations present aggregation distribution at spatial scale, and the aggregation intensity of P.pruinosa population is smaller than P.euphraticas. Aggregation scale and aggregation intensity of P.pruinosa and P.euphratica declines gradually with the growing of two populations, and distribution pattern of adult trees trendes to be random. In terms of spatial correlation, P.pruinosa population presents mutual independence among different growth stages at spatial scales of 0—25 m, and small trees and middle trees of P.euphratica present significantly positive correlation at spatial scale of 5—10 m. Middle trees of P.pruinosa and P.euphratica are negatively associated at the scale of 23—25 m, and the two populations are correlated at small scales and independent at middle scales.

Key words: desert riparian forest, population structure, point pattern analysis, spatial pattern, spatial correlation

中图分类号:

Q948.15

于军;王海珍;陈加利;韩路;*. 塔里木河流域荒漠河岸林胡杨群落的空间格局研究[J]. 中国沙漠, 2011, 31(4): 913-918.

YU Jun;WANG Hai-zhen;CHEN Jia-li;HAN Lu;. Spatial Pattern of Populus Euphratica Community of Desert Riparian Forest in Tarim River Basin[J]. JOURNAL OF DESERT RESEARCH, 2011, 31(4): 913-918.

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