Search results for "Forest"

Dead wood profile of a semi-natural boreal forest – implications for sampling

2019

Dead wood profile of a forest is a useful tool for describing forest characteristics and assessing forest disturbance history. Nevertheless, there are few studies on dead wood profiles, including both coarse and fine dead wood, and on the effect of sampling intensity on the dead wood estimates. In a semi-natural boreal forest, we measured every dead wood item over 2 cm in diameter from 80 study plots. From eight plots, we further recorded dead wood items below 2 cm in diameter. Based on these data we constructed the full dead wood profile, i.e. the overall number of dead wood items and their distribution among different tree species, volumes of different size and decay stage categories. We …

Studio sperimentale del risalto idraulico per differenti condizioni di pendenza e scabrezza del fondo

2008

L’attività di ricerca svolta nel corso dei tre anni del Dottorato di Ricerca in Idronomia Ambientale ha riguardato lo studio sperimentale del risalto idraulico e, più specificatamente, delle grandezze che ne definiscono la geometria, vale a dire le altezze coniugate e la lunghezza del roller. In particolare l’attività di ricerca è stata incentrata sullo studio, alla scala di laboratorio, del risalto su fondo scabro e di quello denominato B-jump. Dopo una prima fase di studio della letteratura scientifica pertinente, l’indagine è stata orientata alla verifica, sulla base delle misure sperimentali condotte e dei dati di altri Autori, delle relazioni esistenti in letteratura per la stima sia d…

Un modello energetico-idrologico per la stima distribuita dell’evapotraspirazione alla scala di bacino: prime applicazioni

2012

PLOT LENGTH EFFECTS ON RUNOFF AND SOIL EROSION AT THE SPARACIA EXPERIMENTAL SITE

2018

Explaining scale effects for runoff and erosion improves our understanding of erosion processes. In this investigation, plot length effects on event runoff per unit area, Qe, sediment concentration, Ce, and soil loss per unit area, SLe, were checked at the Sparacia (Italy) site. The most common result, occurring for the 57-62% of the events depending on the considered variable, was the lack of any scale effect. When scale effects were detected, they indicated that longer plots yielded smaller Qe and SLe values and higher Ce values. Rainfall characteristics did not explain the occur-rence of significant scale effects nor they were able to describe changes in the scaling exponent for Ce and S…

Implementing kiva antibullying program in pioner schools in Spain

2022

This study analyzes the implementation of the KiVa Antibullyiing program in Spain with 10 pioneer schools. This research has two aims. The first is a preliminary evaluation of the KiVa program’s implementation in the pioneer schools in Spain. To do so, the perceived levels of bullying and victimization have been analyzed through the surveys done anonymously by the students of 10 KiVa schools before and after the program’s implementation. The second is to identify the factors which explain the phenomenon with a view to knowing the background of the victims and the bullies and proposing courses of action. To do so, the school environment (atmosphere in the classroom and in the school), the pe…

Survival, Growth and Mycorrhization of Containerised Pinus sylvestris and Picea abies Seedlings of Different Provenances Outplanted in a Forest Clear…

2017

Abstract We studied field performance of containerised Pinus sylvestris and Picea abies seedlings of different provenances. Shoot height, needle chemical composition, root collar diameter, root mycorrhization and mycorrhizal species composition were evaluated after four growing seasons following outplanting. The results showed that in general spruce had better survival than pine. Ectomycorrhizas on spruce were dominated by Wilcoxina, Amphinema and Tylospora, while on pine — by Suillus and Thelephora species. Spruce and pine showing best growth rates were colonised by ectomycorrhizal fungus Amphinema sp. In conclusion, the results demonstrated that forest nursery practices as well as provena…

Testing the Modified Sediment Delivery Model (MOSEDD) at SPA2 Experimental Basin, Sicily (Italy)

2017

A new version of a spatially distributed sediment delivery model taking into account the hillslope sediment transport efficiency, named MOSEDD, is presented. This model gives estimates of basin sediment yield at event scale, which are more reliable than those obtained by the original SEDD. For SPA2 basin discretized into morphological units, four different calculation schemes of MOSEDD, including the original SEDD version, were applied. All parameterization schemes of the model were calibrated using 15 events measured at the outlet of the experimental basin in the period February 2005–February 2010. The model calibration was used to determine a relationship between the coefficient βe of the…

Innovative In Situ and Ex Situ Conservation Strategies of the Madonie Fir Abies nebrodensis

2022

Abies nebrodensis (Lojac.) Mattei is an endemic species of the north-west of Sicily located in an 84 ha area in the Madonie Regional park. The current population is limited to 30 relic adult trees and a fluctuating number of juveniles of natural regeneration. The species is defined as “Critically Endangered” in the Italian list of threatened plants and is classified as CR-D in the 2000 IUCN Red List of Threatened Species. This article reports the key action undertaken by the LIFE4FIR project aimed at preserving A. nebrodensis, and the results obtained so far in three years of activity. OpenArrays SNPs genotyping revealed a high rate of inbreeding in the natural population and that the adult…

Closure to "Assessing stage-discharge relationships for circular overflow structure" by M. Bijankhan and V. ferro

2018

The paper is a closure to a previous article.

Discussion of “Three Simple Flumes for Flow Measurement in Open Channels” by Zohrab Samani

2018

In this paper the results on three simple flumes for flow measurements are discussed.