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Title: Aportació a l'estudi dels herbassars higronitròfils (Al. Sylibo-Urticion) dels trams finals dels rius Besòs i Llobregat
Author: Pino i Vilalta, Joan
Keywords: Males herbes
Associacions vegetals
Besòs (Catalunya : Riu)
Llobregat (Catalunya : Riu)
Plant communities
Besòs River (Catalonia)
Llobregat River (Catalonia)
Catalonia (Spain)
Issue Date: 2000
Publisher: Departament de Biologia Vegetal, Universitat de Barcelona
Abstract: Artemisio annuae-Conietum maculati ass. nova is described from the lower valley of Llobregat and Besòs rivers. Communities of this association, which is included into the Silybo-Urticion Sissingh 1950 alliance, are hygronitrophilous meadows up to 3 m high and more than 80% of vegetation cover. They are commonly restricted to the river bed and are made up almost exclussively by therophytes and hemicryptophytes. However, the most characteristic trend of these herbaceous communities is the abundance of neophytes, which stand for 20% of the species but close to 50% of vegetation cover. Several widespread neophytes such as Aster squamatus, Conyza spp., Xanthium spp. are commonly found in these communities, and other rare aliens such as Artemisia annua, Rumex cristatus and R. palustris have recently been recorded. Ecological implications of the neophyte abundance in these communities are discussed in relation to the role of human disturbance and population biology of alien species in general.
Note: Reproducció digital del document publicat en format paper
It is part of: Acta Botánica Barcinonensia, 2000, vol. 46, p. 179-190
ISSN: 0210-7597
Appears in Collections:Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)

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