1,721,067 research outputs found
Patterns of biodiversity and habitat sensitivity in agricultural landscapes
No full textDesign of landscape is the process of the arrangement of spatial features with the objective of sustaining ecosystem services, and maintaining ecological functionality to meet societal needs. Along a gradient of cultivation intensity, the functional quality of agricultural landscape was explored and the relationships between landscape metrics and functional quality were analyzed, in order to make effective recommendations for landscape design aimed at sustainable land use schemes. The functional quality of landscape was calculated using the InVest model for 20 farm landscapes (North-Eastern Italy) where biodiversity (plant taxa) and sensitivity to disturbance (hemeroby) were used as model inputs. Results highlighted the importance of specific habitat types such as meadows and woodlands rather than other habitats for improving the biodiversity of agricultural landscapes. A high proportion of these habitats enhanced the functional quality of the landscape when the habitats were organized in large and not isolated patches in heterogeneous landscapes. © 2016 Newcastle Universit
Ibridi del genere Prunella in Friuli Venezia Giulia
No full textSi comunica il ritrovamento di Prunella x dissecta Wender. e P. x spuria Stapf,
entità ibride non segnalate nel recente Nuovo Atlante Corologico delle piante vascolari nel Friuli Venezia
Giulia. Di seguito sono brevemente descritti i caratteri distintivi tra le diverse entità ibride includendo
P. x intermedia Link, nuova per la Provincia di Udine
Green alder communities in the Alps: phytosociological variability and ecological features
No full textAlpine Alnus viridis ( = Alnus alnobetula) communities were studied. A total of 306 phytosociological relevés of Austrian, French, German, Italian and Swiss alpine regions were analysed. Data analysis showed the existence of two associations distinguished on an ecological basis. The first agrees with the classic description of Alnetum viridis found on hygronitrophilous soils in avalanche gullies and moderately steep slopes and is characterized by perennial tall herbs. The second, proposed as new association Rhododendro ferruginei–Alnetum viridis, colonizes mesoacidophilous soils on moderate slopes and disused pastures and is characterized by shrubby invasive species. The association's variability was also examined. Four subunits were identified, distinguished by ecological factors. Comparison tests and constrained ordination of the ecological features (i.e. geomorphology, biodiversity, Ellenberg's indicator values) allowed the discrimination of the main ecological factors that affect the distinction of the coenoses. These were soil reaction, water and soil nitrogen availability, slope, altitude and the influence of grazing. The absence of biogeographical influences and its biodiversity contribution are also discussed
Fabbricati rurali e componenti ambientali per la lettura del paesaggio montano
No full textSince the landscape is given by the co-evolution between nature and human activities, the anthropogenic and environmental components must be integrated. For all practical purposes, this imply to consider the farm buildings together with the agro-ecosystems elements associated from a structural or a functional standpoint. In mountain areas the rural building dedicated for drying of products and the permanent meadow is a couple very important for rural heritage. The study is aimed at take a reading of the couple formed by permanent meadows and the rural building Kozolec. The results showed this two landscape elements as key elements for the cultural landscape identity, for the biodiversity conservation and for the multi-functionality of landscape
Carte putative di distribuzione dei principali phylum macroalgali della Laguna di Grado e Marano
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