1,721,259 research outputs found
Valore pastorale delle associazioni vegetali: un esempio di applicazione nell'Appennino umbromarchigiano (Italia)
Full text linkVengono presentati i risultati di una ricerca finalizzata alla caratterizzazione delle praterie di un settore dell'Appennino umbro-marchigiano realizzata mediante il confronto e l'integrazione di informazioni ottenute applicando il metodo fitosociologico e quello fitopastorale. In particolare è stata presa in esame l'associazioneBrizo mediae-Brometum erecti, nell'ambito della quale sono state individuate quattro varianti, corrispondenti ad altrettantefaciespastorali, che si differenziano in base alla composizione floristica e alle esigenze ecologiche. II valore pastorale dell'associazione, valutato sia in base ai rilievi fitosociologici che a quelli puntiformi, è compreso tra 23'e 44. I valori minimi si riferiscono ai pascoli mesoxerofili di cresta, quelli massimi ai prati-pascoli mesofili del piano alto-collinare, in posizione ridossata, su terreni profondi.II buon livello di corrispondenza riscontrato tra il metodo dei rilievi puntiformi e quello fitosociologico, per l'identificazione dellefaciespastorali e l'assegnazione del valore pastorale, sembrerebbe indicare la possibilità di integrare i dati fitosociologici già disponibili per le praterie con l'analisi fitopastorale al fine di renderli utilizzabili per scopi applicativi anche con la realizzazione di carte tematiche attraverso Sistemi Informativi Geografici.This paper reports the resulls of an integrated phytosociological and phytopastoral analysis carried out in the grasslands of Umbria and Marche Appennines. The communities under study belong to the associationBrizo mediae-Brometum erecti. On the basis of the floristic composition and ecologie requirements, four variants corresponding to as many pastoralfacieswere identified. Grazing value was assessed both from phytosociological relevès and point quadrats. The mesoxeric pastures of the top of the mountains showed the lowest grazing value (23); the mesophilous cut grasslands of the high-hiIIy bell, on deep soils and protected from the wind, showed the highest (44).The good level of correspondence between the two phytosociological and point quadrat methods in assessing the grazing value and pastoralfacies,
suggests a potential for the integration of the avaiIable phytosociological data concerning grasslands' with the phytopastoral analysis, e.g. to develop thematic maps through Geographical Information Systems that could be useful for the management of rangelands
Vegetation series as a tool forthe assessment of ecosystem services (ESS) of grassland in Mediterranean Grazing Systems
No full textDoes cross-taxon analysis show similarity in diversity patterns between vascular plants and bryophytes? Some answers from a literature review
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Il Giardino Fenologico di Oristano (Sardegna centro-occidentale) come modello per l'area del Mediterraneo
Full text linkThe paper reports the results of a 5-year study aimed at identifying tree and shrub species suitable to set up a phenological garden in a Mediterranean area and at defining and characterisingthe pheno-phases to be observed.The survey was carried out in the experimental Phenological
grden of Oristano (central-west Sardinia) and allowed the identification of 10 suitable species out of 15 and the definition of 41 pheno-phases
A large-scale assessment of Isoetes histrix s.l. swards in the Mediterranean basin
No full textOne of the most vulnerable community types in the Mediterranean basin are the Isoetes histrix swards. The present study, based on a literature review, was aimed to define patterns of plant communities with I. histrix and to identify the key factors driving these patterns at large spatial scale. Data from 7 areas (Corsica, Crete, Italian peninsula, Portugal, Sardinia, Spain, and Tunisia) were assembled into a composite matrix including 255 surveys and 314 species. To each survey the following abiotic variables were associated: geographic position, elevation, distance from the sea, annual precipitation, average annual temperature, and substrate type. Exploratory analysis reveals extremely high beta diversity among and within the localities, which calls for protection measures to be taken individually in each area. The most influential abiotic factor explaining this diversity is precipitation, which necessitates special management plans to maintain the hydrological status of each site. The fact that precipitation, a relatively unpredictable and unstable climatic variable is most influential, confirms that the isoetid communities of the Mediterranean region are vulnerable to climatic changes
Ceterach officinarum Willd. in: Dino Marchetti (ed.) Notule Pteridologiche Italiane VII (156-177)
No full textLa Vegetazione psammofila della Sardegna settentrionale: litorale del Liscia
Full text linkIn this paper the authors examine the psammophyte vegetation of a part of the northern littoral in Sardinia, characterized by a peculiar morphology of the bar beach. The vegetational seriation is analyzed, and new psammophyte associations are described and typified:Ephedro-Helichrysetum microphylli; Ephedro-Helichrysetum microphylli armerietosum pungenti; Scrophulario-Helichrysetum microphylli; Armerio-Scrophularietum ramosissimae; Sileno-Jasionetum montanae.Gli autori esaminano la vegetazione psammofila di un litorale della Sardegna settentrionale caratterizzato
da una particolare morfologia del cordone dunale. E' stata analizzata la seriazione delle fasce di vegetazione e sono state individuate e tipificate nuove associazioni psammofile:Ephedro-Helichrysetum microphylli; Ephedro-Helichrysetum microphylli armerietosum pungentis; Scrophulario-Helichrysetum microphylli;
Armerio-Scrophularietum ramosissimae; Sileno-Jasionetum montanae
Some remarks on the flora and land use in North-Western Sardinia
No full textSome notes on the flora of Sassarese (North-Western Sardinia) and its modificationsin the last century in connection with changes in the land use are here discussed..
How to identify Mediterranean temporary wet habitats according to the Habitats Directive?
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