1,721,015 research outputs found
Sulle comunità ad Achnatherum calamagrostis (L.) Beauv. lungo il tratto costiero lucano (Basilicata, Italia meridionale).
No full textAnalisi cenologica e sinecologica delle comunità rupicole costiere tirrenich
Old coppice versus high forest: The impact of beech forest management on plant species diversity in central Apennines (Italy)
No full textAims: Silvicultural management plays a major role in shaping understory diversity through its action on stand structure. In many parts of Europe, recent socioeconomic changes have led to the progressive abandonment of coppicing in favor of high forest (HF) management. In order to examine how this change impacts understory species, we compared old coppice-with-standards and HF stands in terms of structural features and understory richness and composition, also taking into account the diagnostic species pool of the habitat. Since the management systems for coppices and HFs differ in cutting regime, we expect that they would cause different changes in floristic composition and richness. Methods: The study area was the Montagne della Duchessa massif, in central Italy. Structural differences and floristic richness were compared, and the diagnostic species diversity was analyzed using rarefaction curves and Rényi diversity profiles. Differences in understory composition were analyzed through indicator species analysis. Important Findings: Our results showed that, though the old coppices have a slightly higher number of understory species in general, the HF stands have greater mean species richness in both understory and diagnostic species, the latter being more evenly distributed inside the community. These finding were related to the cut regime, which favor a constant canopy cover over time and thus the maintenance of more stable microclimatic conditions, promoting the higher abundance and evenness of shade-tolerant and vernal species. Conversely, the dense canopy of the old coppice appears to affect the understory richness by reducing the presence of light-demanding species, but still without a complete recolonization of the shade-tolerant species. Overall, our findings provide the first insights supporting that, in a Mediterranean montane context, old coppice conversion to HF could over time improve the species diversity in these habitats and help maintain good conservation status of the typical mature beech forests
Primi risultati sull'inquadramento fitosociologico delle cenosi forestali dei M.ti Lattari (Appennino meridionale, Campania)
No full textDescrizione delle principali cenosi forestali rinvenute nel territorio della Penisola Amalfitana, in chiave fitosociologica e sintassonomic
Phytosociology and ecology of the Mediterranean forests ecosystems in the Amalfi Coast (Monti Lattari, Italy)
No full textThe forest vegetation of the southern sector of the Monti Lattari complex (Amalfi Coast) has been investigated due to the lack of information on vegetation within an area of worldwide relevance and with a high floristic richness. This area shows several environmental peculiarities due to the marked orography, with pedologic features varying from carbonate to volcanic character, and bioclimatic conditions varying in a relatively short space from Mediterranean to temperate types. The study involved an extensive phytosociological survey and the analyses revealed clear differences among the forest communities, whose syntaxonomical queries and the biogeographic and ecological characters have been discussed. The communities varied from the coastal sclerophyllous forests (Cyclamino repandiâQuercetum ilicis) to the mixed thermophilous deciduous forests (Festuco exaltataeâAceretum neapolitani, Seslerio autumnalisâAceretum obtusati), and from the mountain neutralâsubacid forests (Salvio glutinosaeâAlnetum cordatae, Castanea sativa groupment, Asperulo taurinaeâAlnetum cordatae) to the mountain beech forest (Anemono apenninaeâFagetum sylvaticae). Multivariate analysis showed the high relevance of steepness, elevation and pyroclastic presence, and a low relevance of aspect in the discrimination of forest communities. Syntaxonomical interpretations showed the affinity of the local communities with those of the southern Italy, but also some interesting peculiarity. Data highlight the area as a geographical boundary and phytogeographic hinge between central and southern Italy
Le formazioni ad Alnus cordata (Loisel.) Desf. del complesso dei Monti Lattari: aspetti ecologici e sintassonomici
No full textDescrizione delle formazioni ad Alnus cordata presenti sui Monti Lattar
Analisi bioclimatica e cartografia di base ed applicata alla gestione territoriale della Costiera Amalfitana
No full textBioclimatical and vegetational analysis of the Costiera Amalfitana (Campania, Southern Italy
Understory functional response to different management strategies in Mediterranean beech forests (central Apennines, Italy)
No full textThe aim of this paper was to investigate the functional composition of the understory of Mediterranean beech forest stands that have been managed in two different ways, namely, coppicing and tree by tree harvesting. In particular, we used a trait-based approach to characterize old coppice and high forest stands, analyzing their differences and evaluating the status of old coppices by considering their conversion towards high forest stands. The study area was the Montagne della Duchessa massif in central Italy, which lies at the center of the Apennine chain. Sixty-six plots were laid out and their species abundance and structural parameters were recorded. Data on plant traits were collected using both European databases and the literature available. Redundancy analysis was performed to assess the relationship between trait states and management, and forward selection was used to identify the structural parameters with a significant effect on trait variability. A Wilcoxon Rank-Sum test was done to assess differences in trait states between the management types. High forests proved to be more related to traits typical of mature forest conditions, while old coppices seemed not to have a clear trait association, except for some trait states related to open habitats, and showed the same âmature forestâ trait composition, even if with lower abundances. This indicates that, despite the higher initial disturbance pressure, once abandoned, old coppices tend over time to evolve naturally towards mature forest functional conditions
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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