A review of anthropogenic sources of nitrogen and their effects on Canadian aquatic ecosystems. Schindler, D., W., Dillon, P., J., & Schreier, H. Biogeochemistry, 79(1-2):25-44, 2006.
A review of anthropogenic sources of nitrogen and their effects on Canadian aquatic ecosystems [pdf]Paper  abstract   bibtex   
Nitrogen releases to air and water are low in most of Canada, but in southern areas with rapid development there are telltale signs of the problems from releases to air and water that are described elsewhere in this volume. These include higher nitrogen in water and releases to the atmosphere from urban areas, industry and agriculture. As a result, in parts of Ontario and Quebec underlain by Precambrian geology, nitrogen deposition is near the critical loads found for geo- logically similar areas of Europe. In particular, combined inputs of sulphuric and nitric acids are causing base cation depletion in forest soils and keeping some lakes at pH values too low to allow the recovery of biological communities. In southern Ontario, Alberta and British Columbia, rapidly expanding human populations, industry and agriculture are causing high concentrations of nitrate in surface and groundwaters. At present, there is little sign of estuarine eutrophication in Canada, but it appears to be imminent on the Pacific coast, as the result of expanding human populations and intensifying agriculture in the lower Fraser Valley and Puget Sound. Steps should be taken now to prevent the widespread problems caused by nitrogen pollution that have occurred in Europe, the USA, and other populous and industrialized regions.
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 title = {A review of anthropogenic sources of nitrogen and their effects on Canadian aquatic ecosystems},
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 year = {2006},
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 keywords = {ACIDIFICATION,AGRICULTURE,AQUATIC ECOSYSTEMS,ATMOSPHERIC DEPOSITION,ELA,EMISSIONS,Europe,FORESTS,NITROGEN,NUTRIENTS,REVIEW},
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 abstract = {Nitrogen releases to air and water are low in most of Canada, but in southern areas with rapid development there are telltale signs of the problems from releases to air and water that are described elsewhere in this volume. These include higher nitrogen in water and releases to the atmosphere from urban areas, industry and agriculture. As a result, in parts of Ontario and Quebec underlain by Precambrian geology, nitrogen deposition is near the critical loads found for geo- logically similar areas of Europe. In particular, combined inputs of sulphuric and nitric acids are causing base cation depletion in forest soils and keeping some lakes at pH values too low to allow the recovery of biological communities. In southern Ontario, Alberta and British Columbia, rapidly expanding human populations, industry and agriculture are causing high concentrations of nitrate in surface and groundwaters. At present, there is little sign of estuarine eutrophication in Canada, but it appears to be imminent on the Pacific coast, as the result of expanding human populations and intensifying agriculture in the lower Fraser Valley and Puget Sound. Steps should be taken now to prevent the widespread problems caused by nitrogen pollution that have occurred in Europe, the USA, and other populous and industrialized regions.},
 bibtype = {article},
 author = {Schindler, D. W. and Dillon, P. J. and Schreier, H.},
 journal = {Biogeochemistry},
 number = {1-2}
}
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