Journal
ENVIRONMENTAL POLLUTION
Volume 157, Issue 2, Pages 664-672Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2008.08.008
Keywords
Acidification; Acid deposition; Foliar nutrition; Exchangeable base cations; Sulphur deposition
Categories
Funding
- National Science and Engineering Research Council (NSERC)
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To assess the impacts of the decline in sulphur (S) deposition over the past 20 years in Ontario, soil chemistry and sugar maple (Acer saccharum Marsh) foliar chemistry were measured at 17 sites in south and central Ontario in 2005 and compared with archived samples collected in 1986. Foliar S concentrations were lower in 2005, reflecting the decline in S deposition whereas foliar N remained unchanged, reflecting the lack of change in N deposition in Ontario. Mineral soil pH, exchangeable base cations were lower in 2005 whereas total S, N and cation exchange capacity (CEC) were unchanged. Foliar concentrations of Ca were positively related to soil Ca levels in the A-horizon and were lower in 2005. Despite evidence of increasing soil acidity and losses of calcium, foliar base cation concentrations at most sites were adequate for sugar maple and forest health in terms of canopy appearance (Decline Index) improved. (C) 2008 Elsevier Ltd. All rights reserved.
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