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How does forest landscape structure explain tree species richness in a Mediterranean context? 总被引:1,自引:0,他引:1
Although the strong relationship between vegetation and climatic factors is widely accepted, other landscape composition and
configuration characteristics could be significantly related with vegetation diversity patterns at different scales. Variation
partitioning was conducted in order to analyse to what degree forest landscape structure, compared to other spatial and environmental
factors, explained forest tree species richness in 278 UTM 10 × 10 km cells in the Mediterranean region of Catalonia (NE Spain).
Tree species richness variation was decomposed through linear regression into three groups of explanatory variables: forest
landscape (composition and configuration), environmental (topography and climate) and spatial variables. Additionally, the
forest landscape characteristics which significantly contributed to explain richness variation were identified through a multiple
regression model. About 60% of tree species richness variation was explained by the whole set of variables, while their joint
effects explained nearly 28%. Forest landscape variables were those with a greater pure explanatory power for tree species
richness (about 15% of total variation), much larger than the pure effect of environmental or spatial variables (about 2%
each). Forest canopy cover, forest area and land cover diversity were the most significant composition variables in the regression
model. Landscape configuration metrics had a minor effect on forest tree species richness, with the exception of some shape
complexity indices, as indicators of land use intensity and edge effects. Our results highlight the importance of considering
the forest landscape structure in order to understand the distribution of vegetation diversity in strongly human-modified
regions like the Mediterranean. 相似文献
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