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Canopy interaction with precipitation and sulphur deposition in two boreal forests of Québec, Canada

Summary

Published in Environmental Pollution 162: 354-360. https://doi.org/10.1016/j.envpol.2011.12.007 

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-SO4 in throughfall and precipitation, suggests high proportion of dry deposition in winter (up to 53%o) as compared to summer (1-9%). However, a 3.5%o decrease in d18O-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 d18O-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.

Sector(s): 

Forests

Categorie(s): 

Scientific Article

Theme(s): 

Ecosystems and Environment, Forest Ecology, Forestry Research, Forests

Departmental author(s): 

Duchesne, Louis, Houle, Daniel

Author(s)

MARTY, C., Daniel HOULE, Louis DUCHESNE and C. GAGNON

Year of publication :

2012

Format :

Paper

Keywords :

dépôt acide, couvert forestier, pluviolessivat, sulfate, écologie écosystèmes et environnement, isotope, écosystèmes et environnement, article scientifique de recherche forestière, ecosystems and environment, acid deposition, canopy, throughfall, sulphate

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