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Land-use influence on Mediterranean perennial swards of Poa bulbosa: a case study in the International Tagus Region
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Orientador(es)
Resumo(s)
Pastureland abandonment or intensification of livestock activity change the floristic patterns of Mediterranean perennial
swards which are very important to the conservation of some bird species. The objectives of this study are: 1) to recognise
floristic patterns in Mediterranean perennial swards of Poa bulbosa; 2) to identify the communities that configure the European
priority habitat 6220* (Pseudo-steppe with grasses and annuals of the Thero-Brachypodietea); 3) to assess the
effects of land-use management on the floristic composition of these communities. Field research was conducted in central
eastern and south eastern main land Portugal.Vegetation sampling was carried out in 2009-2010 on 9 sward sites, following
the phytosociological concepts. Classification and ordination of relevés were obtained by Two Way Indicator Species
Analysis (TWINSPAN), Canonical Correspondence Analysis (CCA) and Detrended Canonical Correspondence Analysis
(DCCA). Monte Carlo Permutation Tests were performed to analyse differences in floristic patterns. Livestock load, stoniness
and land-use history of the last 10 years were selected as the key variables that best explain the ordination model.
The absence of extensive livestock grazing results in a reduction of Trifolium subterraneum-dominated areas and in a density/
cover reduction of Poa bulbosa-dominated areas. High livestock loads change the floristic patterns of Mediterranean
short swards by favouring species of the Stellarietea mediae class. The control of woody vegetation through grazing or
cutting is a key conservation measure
Descrição
Palavras-chave
conservation floristic patterns management Mediterranean short swards priority habitat
Contexto Educativo
Citação
"Lazaroa". ISSN 0210-9778. 33 (2012) 51-64