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Tiziano Piccardo - Politecnico di Torino - [2005-06]

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Tesi completa: 65 pagine

The problem of eutrophication in the Laholm Bay has been understood as increased nitrogen concentrations occurring in streams from forested catchment since 1970s. By means of a numerical tool simulating ecosystems flow and processes, COUPMODEL, different possible explanations to such an increasing trend of nitrogen leaching were searched for. Looking into different nitrogen pools in the ecosystem we found that the different management practices could effect only marginally the leaching. Climate variability, which in the last decades is characterised by combination of high temperatures and precipitations, suggested instead to be quite an important factor, accounting for at least 10 % of the leaching increase as well as nitrogen deposition from the atmosphere, which has increased during the last 30 years and which could bring to higher losses during the clearcut. The long turn over time in the soil and the uncertain response of the forest to increased inputs were found to be of high importance for future research...