ENVIRONMENTAL PATTERNS AND PLANT-DISTRIBUTION ALONG A PRECIPITATION GRADIENT IN WESTERN PATAGONIA

被引：42

作者：

BERTILLER, MB ^{[1
]}

ELISSALDE, NO ^{[1
]}

ROSTAGNO, CM ^{[1
]}

DEFOSSE, GE ^{[1
]}

机构：

[1] INTA,EEA CHUBUT,RA-9100 TRELEW,CHUBUT,ARGENTINA

来源：

JOURNAL OF ARID ENVIRONMENTS | 1995年 / 29卷 / 01期

关键词：

PLANT DISTRIBUTION; ENVIRONMENTAL PATTERNS; GRAZING DISTURBANCE; FESTUCA PALLESCENS;

D O I：

10.1016/S0140-1963(95)80066-2

中图分类号：

Q14 [生态学（生物生态学）];

学科分类号：

071012 ; 0713 ;

摘要：

Plant species distribution along a gradient of precipitation was analysed in western Patagonia. First, the affinity of 53 vegetation releves was tested by principal component analysis of the matrix of n x n binary correlations among species cover values. Further, the relationship between plant cover (Festuca pallescens, shrubs, and Stipa spp.) and the environmental factors (precipitation, soil texture, soil depth, altitude, landscape form, aspect, and disturbance) was analysed by stepwise regression analysis. Five homogeneous vegetation units could be identified at several different regions of the gradient. Soil characteristics associated to precipitation levels (i.e. texture, profile depth), but not precipitation per se, were strongly related to the cover of F. pallescens and shrub species. A model of transitions in the composition of vegetation is introduced which includes soil variables, site conditions and the spatial distribution of grazing herds.

引用

页码：85 / 97

页数：13

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