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Species,growth form,and biogeographic diversity of summit vegetation along an elevation gradient in the tropical Andes:a baseline for climate change monitoring

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journal of Mountain Science 2022年第12期19卷 3441-3457页

作者： Luis D.LLAMBI Luis E.GAMEZ Roxibell PELAYO carm.n j.azocar jesus E.TORRES nelson j.MARQUEZ Monica B.BERDUGO Francisco CUESTA Lirey A.RAMIREZ Institute of Environmental and Ecological Sciences(ICAE) University of Los AndesMérida5101Venezuela Consorcium for Susteinable Development of the Andean Eco-Region(COnDESAn) Calle Germán Alemán E12-123Quito170504Ecuador Laboratory of Dendrology Environmental and Forestry FacultyUniversity of Los AndesMérida5101Venezuela Ecological Plant Geography Faculty of GeographyUniv.of MarburgDeutschhausstrasse 10Marburg35032Germany Group of Biodiversity Environment and Health Research(BIOMAS)University of Las AméricasQuito170125Ecuador

Tropical alpine ecosystems exhibit outstanding plant diversity and endemism while being particularly sensitive to the impacts of climate *** understanding spatiotemporal changes in plant species composition,richness and community structure along tropical alpine altitudinal gradients is of primary importance,both the functional and historical/biogeographic dimensions of vegetation diversity remain largely *** used Generalized Linear Models and multivariate analyses to assess changes in species,growth forms,and biogeographic groups richness and abundance,in response to habitat variables along an elevation gradient in seven summits(3800 to 4600 m asl)in the Venezuelan Andes,studied using the standardized approach of the GLORIA-Andes monitoring *** habitat variables assessed were soil temperature(-10 cm),soil organic matter,slope inclination,and substrate *** found 113 species,representing72 genera,32 families,13 growth forms,and seven biogeographic origins,that included 25%of endemic *** observed richer vegetation,both in terms of species and growth forms,in summits with higher soil temperatures and higher SOM content,as well as higher biogeographic origin richness with increasing soil *** presence of holarctic elements increased toward higher elevations,while the occurrence of austral antarctic elements increased toward lower *** results indicate that biogeographic and functional approaches to vegetation diversity capture well the effect of abiotic filtering on community structuring in these tropical alpine *** findings constitute an important baseline for monitoring vegetation dynamics linked to climate change in the Venezuelan Andes by highlighting the functional and historical perspective on vegetation analyses,in contrast with more traditional approaches,based only on taxonomic species diversity.

关键词： Alpine vegetation Biogeography Elevation gradient Functional diversity Páramo Soil organic matter Temperature Tropical Andes

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