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The Covered Catchment Experiment at Gårdsjön is a large scale forest ecosystem manipulation, where acid precipitation was intercepted by a 7000 m2 plastic roof and replaced by `clean precipitation' sprinkled below the roof for ten years between 1991 and 2001. The treatment resulted in a strong positive response of runoff quality. The runoff sulphate, inorganic aluminium and base cations decreased,...
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