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Please use this identifier to cite or link to this item: http://dspace.utalca.cl/handle/1950/4601

Title: Consequences of Landscape Heterogeneity on Grassland Diversity and Productivity in the Espinal Agroforestry System of Central Chile
Authors: Ovalle, C.
Del Pozo Lira, Alejandro
Casado, M.A.
Acosta, B.
Miguel, J. M. de
Keywords: Geomorphology; Grazing;Land use; Species richness; Woody plant cover
Issue Date: 2006
Publisher: Springer Netherlands
Citation: Landscape Ecology 21(4): 585-594
Abstract: The current land use system in the anthropogenic savannas (Espinales) of the Mediterranean climate region of Chile, has resulted in considerable heterogeneity at the landscape level which is associated with different covers of the legume tree, Acacia caven. The effects of landscape heterogeneity on the diversity and productivity of herbaceous plant communities were studied in 29 plots of 1000 m2, with a wide range of woody cover. A detrended correspondence analysis of the species × plots matrix explained 73% of the total variation and revealed the existence of two trends of variation in floristic composition: one associated with physiographic position (hillsides and flatlands) and the other related to the number of years since the last cutting, or coppicing, of A. caven. Despite the great majority of the original herbaceous species having disappeared as a result of the prevailing land use system, some native species have been able to survive especially on hillside areas with low grazing intensity. Woody cover was a good indicator of spatial heterogeneity and land use history. It was also correlated with stocking rate, above-ground biomass of herbaceous vegetation, and soil fertility (organic matter, nitrogen and phosphorus concentration), both on hillsides and flatlands. The relationship between woody cover and herbaceous plant species richness was significant and unimodal in flat land areas, and linear, and marginally significant, on hillsides. The consequences of land use changes on the conservation of the ecological and productive values of grasslands are analyzed.
Description: del Pozo, A. Facultad de Ciencias Agrarias, Universidad de Talca, Casilla 747, Talca, Chile.
URI: http://dspace.utalca.cl/handle/1950/4601
ISSN: 0921-2973
Appears in Collections:Artículos en publicaciones ISI - Universidad de Talca

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