Lago Nero: monitoraggio della risposta di un ecosistema all’inquinamento atmosferico e ai cambiamenti ambientali

Pozzoni, Maurizio and Bruder, Andreas and Bulgheroni, Monica and Pera Ibarguren, Sebastian and Scapozza, Cristian and Rioggi, Stefano and Domenici, Mattia and Colombo, Luca (2018) Lago Nero: monitoraggio della risposta di un ecosistema all’inquinamento atmosferico e ai cambiamenti ambientali. Bollettino della Società ticinese di Scienze naturali, 106. ISSN 0379-1254

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Abstract

The deposition of atmospheric pollutants on ecosystems is a key environmental issue, especially in the southern slopes of the Swiss Alps, which receive substantial inputs of pollutants from the Po valley, Italy. High-alpine catchments are particularly sensitive to atmospheric pollutants but also to other current environmental issues including climate change, mainly because of their often low chemical and physical buffer capacity and their sensitive biological communities. The various and complex effects of atmospheric pollutants and environmental change in general warrants an integrative monitoring of sensitive ecosystems. These environmental issues are being addressed by the International Cooperative Programme on Integrated Monitoring of Air Pollution Effects on Ecosystems (ICP IM). The catchment of Lago Nero (Val Bavona, Cantone Ticino) was selected as an ideal site to address these questions and an interdisciplinary monitoring program was thus initiated in 2014. Here, we present an overview and results of parameters monitored during the first three hydrological years, focusing on budgets of nitrogen and sulphur. The collected data suggests that, compared to a wide range of study sites monitored with the same methods, export of deposited nitrogen from the catchment is relatively high, probably due to low assimilation due to low biomass of primary producers. Also exports of sulphur, deposited mainly in the past, are relatively high, indicative of still substantial deposits in the catchment. The consequences of these budgets on processes and biological communities should be assessed in the future of our monitoring programme.

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