Search results for " Selvicoltura"
showing 10 items of 407 documents
Differences of raw cork quality in productive cork oak woods in Sicily in relation to stand density
2010
Differences of raw cork quality, in terms of thickness and porosity, were observed in productive cork oak (Quercus suber L.) stands in the Nebrodi and Iblei mountains of Sicily in relation to stand density. Five study areas were chosen across a range of different stand density satisfying specific sampling requirements among two managed cork oak stands. Analysis of variance using Fisher-Snedecor's F test (p<0,05) were used to identify statistically significant differences of cork quality and sylvicultural, dendrometric and cork stripping parameters between study areas within each stand and also between stands. Relationships between cork quality and sylvicultural and dendrometric parameters w…
Popolamenti marginali di faggio e cambiamenti climatici: criticità dell’applicazione di pratiche colturali classici in ambiente mediterraneo (Sicilia)
2013
Il faggio (Fagus sylvatica) è tra le specie forestali più importanti d’Europa per distribuzione, selvicoltura, rilevanza paesaggistica. Il faggio in Sicilia raggiunge il limite meridionale del proprio areale, nonché le quote altitudinali più elevate in Europa (timberline intorno a 2000 s.l.m.), localizzandosi sui Monti Nebrodi, Madonie ed Etna. La maggior parte di questi soprassuoli è stata tradizionalmente governata a ceduo semplice matricinato, seppur raramente all’interno di un quadro di interventi pianificati di lungo periodo, e molti popolamenti recentemente hanno subito primi interventi di avviamento alla conversione a fustaia. L’assetto attuale di questi soprassuoli è tuttavia destin…
Strumenti conoscitivi per la gestione delle risorse forestali della Sicilia. Tipi Forestali.
2011
Con l’affermarsi di una impostazione selvicolturale basata sulla conoscenza e l’imitazione delle tendenze dinamiche naturali dei boschi e il parallelo consolidarsi della pianificazione forestale polifunzionale, è diventata sempre più sentita la necessità di avere a disposizione idonei metodi di inquadramento della vegetazione forestale per fondare su presupposti ecologici la gestione del bosco, al fine di valorizzare il ruolo multifunzionale delle foreste. Le carte fitosociologiche da un lato e quelle fisionomiche dall’altro, tradizionalmente utilizzate nella pianificazione forestale e normalmente allegate ai Piani d’Assestamento forestale, infatti, si sono rilevate poco adatte a soddisfare…
Carbon stock increases up to old growth forest along a secondary succession in Mediterranean island ecosystems.
2019
The occurrence of old-growth forests is quite limited in Mediterranean islands, which have been subject to particularly pronounced human impacts. Little is known about the carbon stocks of such peculiar ecosystems compared with different stages of secondary succession. We investigated the carbon variation in aboveground woody biomass, in litter and soil, and the nitrogen variation in litter and soil, in a 100 years long secondary succession in Mediterranean ecosystems. A vineyard, three stages of plant succession (high maquis, maquis-forest, and forest-maquis), and an old growth forest were compared. Soil samples at two soil depths (0-15 and 15-30 cm), and two litter types, relatively undec…
Impact of woody encroachment on soil organic carbon and nitrogen in abandoned agricultural lands along a rainfall gradient in Italy
2011
Land use changes represent one of the most important components of global environmental change andhave a strong influence on carbon cycling. As a consequence of changes in economy during the last century, areas of marginal agriculture have been abandoned leading to secondary successions. The encroachment of woody plants into grasslands, pastures and croplands is generally thought to increase the carbon stored in these ecosystems even though there are evidences for a decrease in soil carbon stocks after land use change. In this paper, we investigate the effects of woody plant invasion on soil carbon and nitrogen stocks along a precipitation gradient (200–2,500 mm) using original data from pa…
The Italian TREETALKER NETWORK (ITT-Net): continuous large scale monitoring of tree functional traits and vulnerabilities to climate change
2020
&lt;p&gt;The &amp;#160;&lt;strong&gt;Italian TREETALKER NETWORK (ITT-Net) &lt;/strong&gt;aims to respond to one of the grand societal challenges: the impact of climate changes on forests ecosystem services and forest dieback. The comprehension of the link between these phenomena requires to complement the most classical approaches with a new monitoring paradigm based on large scale, single tree, high frequency and long-term monitoring tree physiology, which, at present, is limited by the still elevated costs of multi-sensor devices, their energy demand and maintenance not always suitable for monitoring in remote areas. The ITT-Net network will be a unique and un…
Impacts of urban environment on the eco-physiological responses of trees: Tree-Talker (TT) new devices for the monitoring of trees
2019
Urban ecosystems will become increasingly important in the coming years. Urban trees are likely to increase in importance to society as their value in enhancing people's sense of well-being as well as the direct economic impacts are increasingly recognized. Urban forest monitoring data are essential to assess the impacts of tree planting campaigns and management programs. Tree-Talker (TT) is a device based ton the Internet of Things (IoT) technology for the monitoring of trees physical and physiological conditions. The TT allows the monitoring of (i) multispectral measurements of the sunlight transmitted through the canopy in 12 bands across the visible and near infra-red spectra; (ii) sap …
Pianificazione forestale territoriale ai fini della mitigazione del dissesto idrogeologico nel bacino del Fiume Imera Settentrionale (PA)
2013
I fenomeni di dissesto idrogeologico determinato dall’azione dei fattori naturali su superfici di diversa natura modificano profondamente il paesaggio. Alle cause di origine naturale si aggiungono le pressioni di natura antropica con effetti negativi nei riguardi del suolo aumentandone la suscettibilità al dissesto. L’obiettivo del presente lavoro è analizzare i dissesti in atto all’interno del bacino del Fiume Imera Settentrionale allo scopo di verificare la possibilità di mitigare tali fenomeni mediante l’adozione di una adeguata pianificazione di interventi forestali. L’indagine ha permesso di analizzare in ambiente GIS la distribuzione dei dissesti cartografati nell’ambito del Piano di …
Vegetation dynamics within afforested coastal areas: regeneration by native species or invasion by alien species?
2017
During the last century, massive reforestation projects along the dunes of the southern Sicily have been carried out. Such interventions, far from being in line with the current trends of close-to-nature silviculture, are, however, particularly interesting to assess the vegetation dynamics in afforestation areas. Furthermore, these kind of interventions may determine two opposite effects, that is renaturalization by native woody species or invasion by alien species. Acacia spp. are among the most widespread and prominent invaders within Mediterranean-climate areas, where they have already shown the capability to deeply change the characters and the functioning of native ecosystems. For inst…
The Halaesa landscape (III B.C.): the origin of the traditional polycultural Mediterranean landscape
2014
The entire Mediterranean basin is characterized by landscape patterns whose compositions result from countless, long and complex cultural and historical processes. This paper traces the historic and “agri-cultural” processes that have characterized these complex agricultural systems and landscapes in order to better define: • the concept of a traditional rural Mediterranean landscape (TML); • the concept and importance of the complex-forms of polycultural (coltura promiscua) systems and landscapes, by following the historic development of this landscape; • their most important structural characters, configuration and bio-diversity at the landscape level, because of its environmental complex…