Modelling oldfield species richness in a mountain area
作者： Alfonso Gutiérrez Teira , Begoña Peco
关键词: Vegetation 、 Species richness 、 Poisson distribution 、 Drainage 、 Generalized linear model 、 Biodiversity 、 Physical geography 、 Context (language use) 、 Environmental science 、 Digital elevation model 、 Ecology
摘要: This paper is an attempt, using statistical modelling techniques, to understand the patterns of vascular plant species richness in mountain pastures ensuing from agriculture abandonment. Species was measured 10 × m plots and explanatory factors used models were physical variables calculated a digital terrain model (DTM) vegetation, lithology, administrative regions maps all constructed 100 m-resolution GIS environment. Poisson regressions, particular type GLM (generalized linear models), construct forward stepwise procedure. The resulting included three topo-ecological derived DTM (mean annual rainfall, specific catchment area distance nearest watercourse) accounted for 70% total variability. Maximum occurred at intermediate rainfall levels, topographic positions with relatively little drainage or areas distant watercourses. discussed context current theories on richness.
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