Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/5054
Título: Floristic composition patterns of Mediterranean annual non-nitrophilous grasslands in Eastern Portugal
Autor: Ribeiro, Sílvia
Ladero, M.
Espírito Santo, M.D.
Palavras-chave: community types
environmental factors
land use factors
therophytic grasslands
variation partitioning
Data: 2012
Editora: Taylor & Francis
Citação: "Plant Biosystems". ISSN 1724-5575. (2012) 1-16
Resumo: Helianthemetea guttati communities are pioneer spring and early summer ephemeral grasslands, dominated by nonnitrophilous therophytes. In Continental Portugal, these communities have not yet been fully investigated, and thus the objectives of the present study are: (1) to identify community types in therophytic grasslands; (2) to recognize those communities that configure the European priority habitat 6220* (pseudo-steppe with grasses and annuals); (3) to establish environmental gradients underlying their spatial variation; (4) to assess how floristic composition is affected by land use factors. Vegetation sampling using phytosociological methodology was carried out on 80 grasslands. Modified Twinspan classification and canonical correspondence analysis (CCA) was applied for the classification and ordination of releve´s whereas partial CCA (pCCA) and variation partitioning were used to assess the relative influence of individual land use factors. Some 270 species were identified across 11 community types whose floristic patterns were mainly explained by environmental gradients related to altitude and soil type while land use variables could only explain a small part of the floristic variation. Based on biogeography and the determination of diagnostic species, four phytosociological new associations and a new subassociation are proposed: Holco-Brachypodietum distachyi, Holco-Micropyretum tenellae, Micropyro- Anthoxanthetum aristati and Leontodonto-Vulpietum bromoidis vulpietosum membranaceae
Peer review: yes
URI: http://hdl.handle.net/10400.5/5054
ISSN: 1724-5575
Versão do Editor: http://dx.doi.org/10.1080/11263504.2012.683543
Aparece nas colecções:CBAA - Artigos de Revista

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