INVESTIGADORES
ROSTAGNO Cesar Mario
artículos
Título:
Environmental pattems and plant species distribution along a gradient of precipitation in westem Patagonia
Autor/es:
BERTILLER, M.B., N. ELISSALDE, C.M. ROSTAGNO, Y G. DEFOSSE
Revista:
JOURNAL OF ARID ENVIRONMENTS
Editorial:
Elsevier
Referencias:
Año: 1995 vol. 29 p. 85 - 97
ISSN:
0140-1963
Resumen:
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.
Keywords: plant distribution; environmental patterns; grazing disturbance;
Festuca pallescens