Search results for "forest"
showing 10 items of 3780 documents
Climate-growth relationships of Quercus gussonei (Borzì) Brullo in the Mediterranean region: adaptive traits and water use efficiency.
2016
Due to their marginal distribution, peripheral tree populations are highly vulnerable and are more likely to be influenced by extreme climate conditions. This occurrence is known to cause dieback in many species at their Mediterranean margins. Quercus gussonei (Borzì) Brullo is a deciduous oak endemic of Sicily. It is a thermophilous, peripheral form of Quercus cerris L. which is showing an incipient but ongoing decline. A deeper ecophysiological knowledge is urgently needed on this species in order to plan proper conservation actions and reduce the risk of its extinction. In the aim to understand at what extent changes in environmental conditions could be responsible for Q. gussonei declin…
Soil carbon accumulation after agricultural abandonment. A Mediterranean case study.
2011
In the last decades, in Europe large agricultural areas have been abandoned. In absence of disturbance factors, renaturation of these areas is rapid due to secondary succession of vegetation communities. In the Mediterranean region, in the last years have been conducted studies on soil carbon accumulation after agricultural abandonment. Soil has to be regarded as the most considerable carbon (C) sink on a global level. CO2 emission compensation is guaranteed also by C uptake by plants and by organic matter accumulation in soils. The present study analyzes organic carbon stock in some soils of Southern Italy, in the Madonie Mountains in Sicily, where large areas are subject to secondary succ…
La pianificazione ai fini della valorizzazione delle risorse legnose in Sicilia: un caso di studio su popolamenti di castagno dei Nebrodi
2019
In Sicily, forest planning still has too many gaps. This study proposes both to make a contribution to the current cognitive framework of the Nebrodi chestnut groves, and to draw up a management plan that is still lacking in order to identify forestry addresses and sustainable management necessary to maintain and defend these forest formations.
Perinnemaiseman hoito keino suojella luontoa
2018
Efectos de las cenizas y la repelencia al agua en suelos afectados por incendios forestales en ecosistemas mediterráneos = Ash and water repellency e…
2012
El fuego es un factor ecológico natural en la Tierra y ha actuado con diferente intensidad desde hace 400 millones de años. En condiciones de clima mediterráneo el fuego es un factor recurrente que las sociedades humanas han controlado desde hace milenios. Sin embargo, tras medio siglo de abandono agrícola y ganadero, la gestión del monte mediterráneo mediante el uso del fuego es inexistente. Además, con la recuperación de la vegetación, el fuego afecta ahora a una densa y continua masa forestal, convirtiendo los incendios en un riesgo por la dificultad en ser controlados y por su elevada intensidad. Este tipo de incendios descontrolados son los que pueden inducir efectos ambientales advers…
Sistema di irrigazione a perno centrale
2021
L’invenzione consiste nell’impiego, nell’irrigazione pivot, dei comuni irrigatori rotanti che si utilizzano nei sistemi di irrigazione a pioggia (o per aspersione), che hanno il vantaggio, rispetto agli spruzzatori ed ai gocciolatori, di essere dotati di un ugello terminale di elevato diametro (4-30 mm). L’idea nasce quindi dalla ricerca di un sistema irriguo che conservi i benefici dell’irrigazione pivot (completa automatizzazione, manodopera limitata alla manutenzione degli apparecchi erogatori, elevata efficienza) e che al contempo rimuova del tutto il problema dell’occlusione degli apparecchi erogatori. Vengono così azzerati i costi di manodopera e, soprattutto, viene consentito l’impie…
Dual-Diameter Laterals in Center-Pivot Irrigation System
2022
Design strategies to enhance modern irrigation practices, reduce energy consumption, and improve water use efficiency and crop yields are fundamental for sustainability. Concerning Center-Pivot Irrigation Systems, different design procedures aimed at optimizing water use efficiency have been proposed. Recently, following a gradually decreasing sprinkler spacing along the pivot lateral with constant diameter and sprinkler flow rate, a new design method providing a uniform water application rate has been introduced. However, no suggestions were given to design multiple-diameter laterals characterized by different values of the inside pipe diameter. In this paper, first the previous design pro…
New and little known Cerambycidae (Coleoptera Chrysomeloidea) from Pantelleria Island (Sicily Channel, Italy)
2019
Cerambycidae (Coleoptera Chrysomeloidea) nuovi e poco conosciuti dell’isola di Pantelleria (Cana-le di Sicilia, Italia).In questa nota riportiamo nuovi dati di due specie di Cerambycidae raccolte sul-l’isola di Pantelleria (Canale di Sicilia, Italia). In particolare, la presenza di Trichoferus holosericeus(Rossi, 1790) è confermata e Cephalocrius syriacus(Reitter, 1895) è riportato come nuovo record
IMPIEGO DEL RADIONUCLIDE 137CS PER LA STIMA DEI PROCESSI EROSIVI IN UN BACINO FORESTATO
2008
Il radionuclide cesio-137 (137Cs) è uno dei traccianti più utilizzati per stimare la perdita di suolo per erosione idrica. L'applicazione di questa tecnica alla scala di bacino richiede anzitutto l'acquisizione delle misure del radionuclide in punti distribuiti sulla superficie e l'utilizzo di modelli di conversione idonei a trasformare i valori di 137Cs in quantità di erosione netta o di deposito. La presente memoria si pone l'obiettivo di verificare l'affidabilità del modello di conversione esponenziale per stimare i processi erosivi in terreni interessati da coperture forestali. L'applicazione è stata condotta in un bacino sperimentale della Sila Greca per il quale sono disponibili alcun…
Influence of HCl pretreatment and organo-mineral complexes on laser diffraction measurement of loess–paleosol-sequences
2016
Abstract The influence of different sample pretreatment methods on grain size distributions in particle size analysis has been subject to controversial discussions. Standard sample preparation typically comprises the disaggregation of aggregated and agglomerated particles into single primary particles, i.e., the organic binding material is oxidized by hydrogen peroxide (H2O2) and the contained carbonates are dissolved by hydrochloric acid (HCl). The aim of this study is to evaluate the effects of HCl treatment on grain size analyses of Late Pleistocene and Holocene loess–paleosol-sequences investigated by a Beckman Coulter LS 13320 laser particle analyzer. For this purpose, samples from two…