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Università degli studi di Sassari (2013)

Riserve di carbonio, forme di humus e qualità biologica in suoli forestali sardi

Cucca, Carlo

Titre : Riserve di carbonio, forme di humus e qualità biologica in suoli forestali sardi

Auteur : Cucca, Carlo

Université de soutenance : Università degli studi di Sassari

Grade : Doctoral Thesis 2013

Résumé
This work concerns the development of new methodological approaches at different ecological scales to evaluate the quality of the forest soils. The study was carried out in four sites : Monte Ferru, Timidone, Ugolio, and Pixinamanna. Three approaches were considered that focus on : - the soil as a habitat for the micro-edaphic fauna (microscopic scale), with particular reference to the method QBS-ar ; - the properties of forest humus and the forest soil as a carbon sink (stational scale) ; - the hydro-ecological functions performed by the soil along the slope, according to the LFA (Landscape Function Analysis) method. Within each study area soils were sampled for laboratory analysis and for the analysis of microarthropods, and the forest humus were classified. The LFA method has been applied only in the Pixinamanna site. The largest organic carbon content was observed for the sites not subjected to recent disturbances. The most common humus is the Amphimull, a humus form typical of the Mediterranean environments characterized by bimodal rainfall. The QBS-ar index showed higher values for situations in which the disturbance factors were removed in remote times, and lower values with higher human impact. The LFA highlighted the different ecological performance of the studies formations. An olistic quality index was defined according to the minimum dataset and the linear scoring approaches, to define and compare the overall quality of the studies forest soils.

Mots clés : Metodo QBS-ar, humus forestali, stock di carbonio organico, qualità dei suoli, Sardegna

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Page publiée le 30 juin 2013, mise à jour le 18 mars 2019