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Wet deposition of nitrogen (N) occurs in oxidized (nitrate) and reduced (ammonium) forms. Whether one form drives vegetation change more than the other is widely debated, as field evidence has been lacking. We are manipulating N form in wet deposition to an ombrotrophic bog, Whim (Scottish Borders), and here report nine years of results. Ammonium and nitrate were provided in rainwater spray as NH4...
In the United Kingdom, as with other European countries, land-based emissions of NO x and SO 2 have fallen significantly over the last few decades. SO 2 emissions fell from a peak of 3185GgS in 1970 to 344GgS in 2005 and are forecast by business-as-usual emissions scenarios to fall to 172Gg by 2020. NO x emissions were at a maximum of 951GgN in 1970 and fell to 378...
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