1,721,079 research outputs found
Forest types for biodiversity assesment (FTBAs) in Europe: the revised classification scheme
No full textA forest typology for monitoring sustainable forest management: the case of European Forest Types
No full textSustainable forest management (SFM) is presently widely accepted as the overriding objective for forest policy and practice.
Regional processes are in progress all over the world to develop and implement criteria and indicators of SFM. In continental
Europe, a set of 35 Pan-European indicators has been endorsed under the Ministerial Conference on the Protection of
Forests in Europe (MCPFE) to measure progress towards SFM in the 44 countries of the region. The formulation of seven
indicators (forest area, growing stock, age structure/diameter distribution, deadwood, tree species composition, damaging
agents, naturalness) requires national data to be reported by forest types. Within the vast European forest area the values
taken by these indicators show a considerable range of variation, due to variable natural conditions and anthropogenic
influences. Given this variability, it is very difficult to grasp the meaning of these indicators when taken out of their ecological
background. The paper discusses the concepts behind, and the requirements of, a classification more soundly ecologically
framed and suitable for MCPFE reporting than the three (un-informative) classes adopted so far: broadleaved forest,
coniferous forest, mixed broadleaved and coniferous forest. We propose a European Forest Types scheme structured into a
reasonably higher number of classes, that would improve the specificity of the indicators reported under the MCPFE process
and its understanding
European forest types: categories and types for sustainable forest management reporting and policy
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Estimating the sensitivity to desertification of Italian forests
No full textThe present study assesses the level of sensitivity to desertification of forest types in Italy between 2000 and 2010 on a fine resolution scale using the Environmental Sensitive Area (ESA) scheme. The proposed methodology identifies and ranks the level of sensitivity of fourteen forest types and quantifies the changes in their level of sensitivity over time as a contribution to understanding of complex landscape-forest interactions in Mediterranean ecosystems. Only few forest types showed a relatively high sensitivity level, suggesting that forests may positively contribute to the mitigation of land degradation processes in the Mediterranean region. Forest types showing the highest sensitivity are native types mostly adapted to dry Mediterranean landscapes, introduced vegetation types and highly-fragmented and heterogeneous forest types. Results suggest that: (i) high-quality and biodiversity-rich forest types (e.g., beech, mountain pine forests) may act as vegetation buffer mitigating the increase of land sensitivity to desertification at the landscape scale; and (ii) the remaining forest types (especially highly fragmented, low-quality or low-biodiversity classes in areas with severe soil and climate conditions) may undergo increases in land sensitivity to desertification and should be protected through specific management measures as also implemented in the framework of the National Action Plans to Combat Desertification
Applicazione della cartografia Corin Land Cover per la macrocaratterizzazione dei paesaggi italiani.
No full textConfronto di Acqua Precipitabile ottenuta da osservazioni GPS al suolo con/senza misure meteorologiche in loco
No full textI sistemi di navigazione satellitare (GNSS) rappresentano, da diversi anni, un confermato e valido strumento per le osservazioni meteorologiche (diagnostica in tempo quasi reale e miglioramento dei modelli di previsione numerica) e per il monitoraggio del clima. In particolare, l’osservazione GPS al suolo permette, attraverso la combinazione dei ritardi zenitali troposferici totali dei segnali GPS con misure di pressione e temperatura alla superficie, la stima del contenuto colonnare totale del vapor acqueo (acqua precipitabile) in atmosfera. La maggior parte delle stazioni permanenti GPS non colleziona misure meteorologiche in corrispondenza effettiva alle rispettive antenne, per cui la valutazione dell’acqua precipitabile necessita l’utilizzo di altri dataset meteorologici. Obiettivo di questo lavoro è stato quello di confrontare, per ogni stazione presa in considerazione, i valori di acqua precipitabile ottenuti dai ritardi GPS, sia utilizzando misure meteorologiche in loco sia utilizzando analisi NCEP/NCAR (risoluzione 2.5° x 2.5°). Le stazioni GPS, da cui sono stati collezionati ritardi zenitali troposferici totali giornalieri prodotti dal Bundesamt für Kartographie und Geodäsie (BKG), appartengono alla rete permanente europea EUREF. Le stazioni analizzate sono state dieci per un periodo di sei anni (2001-2006). I confronti dei dati di acqua precipitabile ottenuti con i due metodi hanno mostrato, per il periodo complessivo e per tutte le stazioni, bias ed RMSE inferiori a 2 kg/m2. Questi risultati suggeriscono un impiego estensivo delle osservazioni GPS (inclusione delle stazioni permanenti prive di misure meteorologiche in loco) per un monitoraggio globale del vapor acqueo in atmosfera
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