Determination and Mapping Critical Loads of Acidity and Exceedances for Upland Forest Soils in Eastern Canada
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Critical loads of acidity were estimated for upland forests in Eastern Canada using the steady-state Simple Mass Balance (SMB) Model. A consistent methodology was applied to the entire region, although critical loads were estimated separately for the Atlantic provinces (New Brunswick, Nova Scotia, Prince Edward Island and Newfoundland), Quebec and Ontario using different data sources. In this project, critical load estimates and steady-state exceedance values did not include the effect of forest fire and forest harvesting, which could have a considerable impact on critical loads in Eastern Canada. The observed soil pH – base saturation relationship for forest soils indicated that the constants used into the calculation of alkalinity leaching should be set to 10 (M/M) for the molar Bc/Al ratio in soil leachate and 109 (mol L−1)2 for the gibbsite dissolution constant. The area-weighted median critical load for each province varied between 519 (Quebec) and 2063 eq ha−1 y−1 (Prince Edward Island), with a median critical load value for Eastern Canada of 559 eq ha−1 y−1. It is estimated that approximately 52% of the mapped area is exceeded in terms of acidity according to the 1994–1998 average total (wet + dry) atmospheric deposition. Greatest exceedances occurred in Ontario and Quebec and in the south of Nova Scotia, due to low critical loads and high loads of acid deposition.
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- Determination and Mapping Critical Loads of Acidity and Exceedances for Upland Forest Soils in Eastern Canada
Water, Air, and Soil Pollution
Volume 172, Issue 1-4 , pp 57-66
- Cover Date
- Print ISSN
- Online ISSN
- Springer Netherlands
- Additional Links
- acid deposition
- Bc/Al ratio
- critical loads
- Eastern Canada
- ecological mapping
- forest soils
- Industry Sectors
- Author Affiliations
- 1. Direction de la recherche forestière, ministère des Ressources naturelles et de la Faune du Québec, Complexe scientifique, 2700 Einstein St., Ste-Foy, Quebec, G1P 3W8, Canada
- 2. Faculty of Forestry & Environmental Management, University of New Brunswick, 28 Dineen Drive, Fredericton, New Brunswick, E3B 6C2, Canada
- 3. Environmental and Resource Studies, Trent University, 1600 West Bank Drive, Peterborough, Ontario, K9J 7B8, Canada
- 4. Canadian Forest Service–Atlantic Forestry Centre, P.O. Box 4000, Fredericton, NB, E3B 5P7, Canada