Journal
ENVIRONMENTAL POLLUTION
Volume 162, Issue -, Pages 354-360Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2011.12.007
Keywords
Sulphur deposition; Canopy; Throughfall; Boreal forest; Sulphate; delta O-18-SO4; delta S-34-SO4; Dissolved organic sulphur; Canopy exchange
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The interaction of atmospheric sulphur (S) was investigated within the canopies of two boreal forests in Quebec, Canada. The net canopy exchange approach, i.e. the difference between S-SO4 in throughfall and precipitation, suggests high proportion of dry deposition in winter (up to 53%) as compared to summer (1-9%). However, a 3.5% decrease in delta O-18-SO4 throughfall in summer compared to incident precipitation points towards a much larger proportion of dry deposition during the warm season. We suggest that a significant fraction of dry deposition (about 1.2 kg ha(-1) yr(-1), representing 30-40% of annual wet S deposition) which contributed to the decreased delta O-18-SO4 in throughfall was taken up by the canopy. Overall, these results showed that, contrary to what is commonly considered, S interchanges in the canopy could be important in boreal forests with low absolute atmospheric S depositions. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved.
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