62 research outputs found
Grasslands European habitats in the CE and SE Portugal continental. Dynamics, management and conservation
Oral presentationN/
A fitossociologia no ordenamento do território em Portugal
info:eu-repo/semantics/publishedVersio
Encontro Internacional de Fitossociologia ALFA, VIII
info:eu-repo/semantics/publishedVersio
Comunidades de Asphodelus bento-rainhae P. Silva : diversidade, ecologia e dinâmica serial
Comunidades de Asphodelus bento-rainhae P. Silva : diversidade, ecologia e dinâmica serial
Floristic composition patterns of Mediterranean annual non-nitrophilous grasslands in Eastern Portugal
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 membranacea
Land-use influence on Mediterranean perennial swards of Poa bulbosa: a case study in the International Tagus Region
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 measur
Infestantes das culturas agrícolas. Chaves de identificação
O presente trabalho destina-se essencialmente ao ensino, nas disciplinas de Botânica e
Herbologia, da sistemática e identificação de táxones que frequentemente se comportam
como infestantes das culturas agrícolas. O esqueleto baseou-se nas chaves dicotómicas
para identificação de infestantes elaboradas em 1983 por Espírito-Santo. A seleção das
espécies referidas nas chaves fundamentou-se nos trabalhos desenvolvidos no Centro de
Botânica e Engenharia Biológica na última década do séc. XX, os quais permitiram
ampliar os conhecimentos, tanto sistemáticos como ecológicos, das principais infestantes
das culturas em Portugal Continental.
A organização do conteúdo do livro consiste primeiramente na elaboração das chaves
das famílias e dos géneros das plantas infestantes selecionadas, com excepção dos géneros
da família das Asteráceas e das Poáceas que são descritos conjuntamente com as chaves
das espécies.
A actualização da presente edição foi efectuada a partir da Checklist da Flora de
Portugal (Continental, Açores e Madeira) (Sequeira et al., 2010). Na ilustração das
famílias, géneros e espécies selecionaram-se os caracteres morfológicos mais relevantes e
de mais fácil observação.
Algumas precauções devem ser tomadas pelos utilizadores destas chaves, já que elas
não abrangem a totalidade das espécies existentes em Portugal e contêm algumas
simplificações. Pelo menos, quando a totalidade das características morfológicas apontadas
não se verifiquem na planta que se pretende determinar, deverão as identificações ser
confirmadas por recurso a "Floras" como as de Franco & Rocha Afonso (1994-2003) e
Castroviejo et al. (1986-2013). Para interpretação dos termos morfológicos elaborou-se um
glossário das designações mais comuns, essencialmente baseado nos conceitos
apresentados por Vasconcellos et al. (1969) e Fernandes (1972).
Para a determinação da família adaptaram-se as chaves dicotómicas de Franco (1982)
para as dicotiledóneas e as de Valdés et al. (1987) para as monocotiledóneas, tendo-se
eliminado as famílias que usualmente não ocorrem como infestantes.
Os nomes vulgares referidos são os seguidos em primeiro lugar por Williams et al.
(1982), apresentando-se outras designações mencionadas em Rocha (1979, 1996) e
Castroviejo et al. (1986-2013
Temporary ponds and hygrophilous grasslands plant communities in Monfurado site of community importance
Temporary ponds are seasonal wetlands subjected to extreme and unstable ecological conditions due to the annual alternation
between the flooded and dry phases. The ephemeral character of the flora and the changeable annual weather explain
why these habitats have been poorly studied and documented. The objective of this study, in the Monfurado Site of Community
Importance, was to characterize seasonal wetland plant communities using a phytosociological approach and numerical analysis
(classification and ordination). The results lead to the site’s inclusion in two Natura 2000 Network priority habitats: Mediterranean
temporary ponds (3170) in depression landform with impermeable layer in the underground with Isoeto-Nanojuncetea
vegetation complexes; pseudo-steppe with grasses and annuals of the Thero-Brachypodietea, sub-type ‘Malhadais’ (6220pt2)
in shallow areas with Isoeto-Nanojuncetea speciesinfo:eu-repo/semantics/publishedVersio
A methodology for creating greenways through multidisciplinary sustainable landscape planning
This research proposes a methodology for defining greenways via sustainable planning. This approach
includes the analysis and discussion of culture and natural processes that occur in the landscape. The
proposed methodology is structured in three phases: eco-cultural analysis; synthesis and diagnosis; and
proposal.
An interdisciplinary approach provides an assessment of the relationships between landscape structure
and landscape dynamics, which are essential to any landscape management or land use. The
landscape eco-cultural analysis provides a biophysical, dynamic (geomorphologic rate), vegetation
(habitats from directive 92/43/EEC) and cultural characterisation. The knowledge obtained by this
analysis then supports the definition of priority actions to stabilise the landscape and the management
measures for the habitats. After the analysis and diagnosis phases, a proposal for the development of
sustainable greenways can be achieved.
This methodology was applied to a study area of the Azambuja Municipality in the Lisbon Metropolitan
Area (Portugal). The application of the proposed methodology to the study area shows that
landscape stability is crucial for greenway users in order to appreciate the landscape and its natural and
cultural elements in a sustainable and healthy way, both by cycling or by foot. A balanced landscape will
increase the value of greenways and in return, they can develop socio-economic activities with benefits
for rural communitiesinfo:eu-repo/semantics/publishedVersio
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