The interaction of atmospheric sulphur (S) was investigated within the canopies of two boreal forests in Québec, Canada. The net canopy exchange approach, i.e. the difference between S-SO 4 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 δ 18O-SO 4 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 δ 18O-SO 4 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. © 2011 Elsevier Ltd. All rights reserved.
CITATION STYLE
Marty, C., Houle, D., Duchesne, L., & Gagnon, C. (2012). Canopy interaction with precipitation and sulphur deposition in two boreal forests of Quebec, Canada. Environmental Pollution, 162, 354–360. https://doi.org/10.1016/j.envpol.2011.12.007
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