Abstract
To assess the concern over declining base cation levels in forest soils caused by acid deposition, input-output budgets (1990s average) for sulphate (SO4), inorganic nitrogen (NO3-N; NH4-N), calcium (Ca), magnesium (Mg) and potassium (K) were synthesised for 21 forested catchments from 17 regions in Canada, the United States and Europe. Trend analysis was conducted on monthly ion concentrations in deposition and runoff when more than 9 years of data were available (14 regions, 17 sites). Annual average SO4 deposition during the 1990s ranged between 7.3 and 28.4 kg ha−1 per year, and inorganic nitrogen (N) deposition was between 2.8 and 13.8 kg ha−1 per year, of which 41–67% was nitrate (NO3-N). Over the period of record, SO4 concentration in deposition decreased in 13/14 (13 out of 14 total) regions and SO4 in runoff decreased at 14/17 catchments. In contrast, NO3-N concentrations in deposition decreased in only 1/14 regions, while NH4-N concentration patterns varied; increasing at 3/14 regions and decreasing at 2/14 regions. Nitrate concentrations in runoff decreased at 4/17 catchments and increased at only 1 site, whereas runoff levels of NH4-N increased at 5/17 catchments. Decreasing trends in deposition were also recorded for Ca, Mg, and K at many of the catchments and on an equivalent basis, accounted for up to 131% (median 22%) of the decrease in acid anion deposition. Base cation concentrations in streams generally declined over time, with significant decreases in Ca, Mg and K occurring at 8, 9 and 7 of 17 sites respectively, which accounted for up to 133% (median 48%) of the decrease in acid anion concentration. Sulphate export exceeded input at 18/21 catchments, likely due to dry deposition and/or internal sources. The majority of N in deposition (31–100%; median 94%) was retained in the catchments, although there was a tendency for greater NO3-N leaching at sites receiving higher (<7 kg ha-1 per year) bulk inorganic N deposition. Mass balance calculations show that export of Ca and Mg in runoff exceeds input at all 21 catchments, but K export only exceeds input at 16/21 sites. Estimates of base cation weathering were available for 18 sites. When included in the mass balance calculation, Ca, Mg and K exports exceeded inputs at 14, 10 and 2 sites respectively. Annual Ca and Mg losses represent appreciable proportions of the current exchangeable soil Ca and Mg pools, although losses at some of the sites likely occur from weathering reactions beneath the rooting zone and there is considerable uncertainty associated with mineral weathering estimates. Critical loads for sulphur (S) and N, using a critical base cation to aluminium ratio of 10 in soil solution, are currently exceeded at 7 of the 18 sites with base cation weathering estimates. Despite reductions in SO4 and H+ deposition, mass balance estimates indicate that acid deposition continues to acidify soils in many regions with losses of Ca and Mg of primary concern.
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References
Aber, J. D., Nadelhoffer, K. J., Steudler P. and Melillo, J. M.: 1989, ‘Nitrogen saturation in northern forest ecosystems’, BioScience 39, 378–386.
Alewell, C.: 2001, ‘Predicting reversibility of acidification: The European sulphur story’, Water, Air, Soil Pollut. 130, 1271–1276.
Alewell, C., Bredemeier, M., Matzner, E. and Blanck, K.: 1997, ‘Soil solution response to experimentally reduced acid deposition in a forest ecosystem’, J. Environ. Qual. 26, 658–665.
Alewell, C., Mitchell, M., Likens, G. E. and Krouse, R. H.: 1999, ‘Sources of stream sulfate at the Hubbard Brook Experimental Forest: Long-term analyses using stable isotopes’, Biogeochem. 44, 281–299.
Alewell, C., Manderscheid, B., Meesenburg, H. and Bittersohl, J.: 2000a, ‘Is acidification still an ecological threat?’, Nature 407, 856–857.
Alewell, C., Manderscheid, B., Gerstberger P. and Matzner, E.: 2000b, ‘Effects of reduced atmospheric deposition on soil solution chemistry and elemental contents of spruce needles in NE-Bavaria, Germany’, J. Plant Nutr. Soil Sci. 163, 509–516.
Alewell, C., Armbruster, M., Bittersohl, J., Evans, C. D., Meesenburg, H., Moritz, K. and Prechtel, A.: 2001, ‘Are there signs of acidification reversal after two decades of reduced acid input in the low mountain ranges of Germany?’, Hydrol. Earth Syst. Sci. 5, 367–378.
Armbruster, M.: 1998, ‘Zeitliche Dynamik der Wasser- und Elementflüsse in Waldökosystemen’, Freiburger Bodenkundl. Abhandl. 38, 1–301.
Bailey, S. W., Hornbeck, J. W., Driscoll, C. T. and Gaudette, H. E.: 1996, ‘Calcium inputs and transport in a base-poor forest ecosystem as interpreted by Sr isotopes’, Wat. Resour. Res. 32, 707–719.
Bailey, S. W., Mayer, B. and Mitchell, M. J.: 2004, ‘The influence of mineral weathering on drainage water sulfate in the northeastern United States’, Hydrol. Process. 18, 1639–1653.
Bayley, S. E., Schindler, D. W., Beaty, K. G., Parker, B. R. and Stainton, M. P.: 1992, ‘Effects of multiple fires on nutrient yields from streams draining Boreal forest and fen watersheds: Nitrogen and phosphorus’, Can. J. For. Res. 49, 584–596.
Beall, F. D., Semkin, R. G. and Jeffries, D. S.: 2001, ‘Trends in the output of first-order basins at Turkey Lakes Watershed, 1982–1996’, Ecosystems 4, 514–526.
Bernier, B. and Brazeau, M.: 1988, ‘Foliar nutrient status in relation to sugar maple dieback and decline in the Quebec Appalachians’, Can. J. For. Res. 18, 754–761.
Bondietti, E. A., Baes, C. F. and McLaughlin, S. B.: 1989, ‘Radial trends in cation ratios in tree rings as indicators of the impact of atmospheric deposition on forests’, Can. J. For. Res. 19, 586– 594.
Bredmeier, M., Blanck, K., Lamersdorf, N. and Wiedey, G. A.: 1995, ‘Response of soil water chemistry to experimental ‘clean rain’ in the NITREX roof experiment at Solling, Germany’, For. Ecol. Manage. 71, 31–44.
Bringmark, L. and Kvarnas, H.: 1995, ‘Leaching of nitrogen from small forested catchments having different deposition and different stores of nitrogen’, Water, Air, Soil Pollut. 85, 1167–1172.
Campbell, J. L., Hornbeck, J. W., Mitchell, M. J., Adams, M. B., Castro, M. S., Droscoll, C. T., Kahl, J. S., Kochenderfer, J. N., Likens, G. E., Lynch, J. A., Murdoch, P. S., Nelson, S. J., Shanley, J. B.: 2004, ‘Input-output budgets of inorganic nitrogen for 24 forested watersheds in the northeastern United States: A review’, Water, Air, Soil Pollut. 151, 373–396.
Clair, T. A., Dillon, P. J., Ion, J., Jeffries, D. S., Papineau, M. and Vet, R. J.: 1995, ‘Regional precipitation and surface water chemistry trends in southeastern Canada (1983–1991)’, Can. J. Fish. Aquat. Sci. 52, 197–212.
Cosby, B. J., Hornberger, G. M., Galloway, J. N. and Wright, R. F.: 1985, ‘Timescales of catchment acidification’, Environ. Sci. Technol. 19, 1144–1149.
Creed, I. F. and Band, L. E.: 1998, ‘Exploring functional similarity in the export of nitrate-N from forested catchments: A mechanistic modeling approach’, Wat. Resour. Res. 34, 3079–3093.
DeHayes, D. H., Schaberg, P. G., Hawley, G. J. and Strimbeck, G. R.: 1999, ‘Acid rain impacts on calcium nutrition and forest health’, BioScience 49, 789–800.
Devito, K. J., Westbrook, C. and Schiff, S. L.: 1999, ‘Nitrogen mineralization and nitrification in upland and peatland forest soils in two Canadian Shield catchments’, Can. J. For. Res. 29, 1793–1804.
Devito, K. J. and Hill, A. R.: 1999, ‘Sulphate mobilization and pore water chemistry in relation to groundwater hydrology and summer drought in two conifer swamps on the Canadian Shield’, Water, Air, Soil Pollut. 113, 97–114.
Dillon, P. J. and LaZerte, B. D.: 1992, ‘Response of the Plastic Lake catchment, Ontario, to reduced sulphur deposition. Environ. Pollut. 77, 211–217.
Dise, N. B., Matzner, E. and Gundersen, P.: 1998, ‘Synthesis of nitrogen pools and fluxes from European ecosystems’, Water, Air, Soil Pollut. 105, 143–154.
Dise, N. B. and Wright, R. F.: 1995, ‘Nitrogen leaching from European forests in relation to nitrogen deposition’, For. Ecol. Manage. 71, 153–161.
Draaijers, G. P. J., van Leeuwen, E. P., de Jong, P. G. H. and Erisman, J. W.: 1997a, ‘Base cation deposition in Europe – Part I. Model description, results and uncertainties’, Atmos. Environ. 31, 4139– 4157.
Draaijers, G. P. J., van Leeuwen, E. P., de Jong, P. G. H. and Erisman, J. W.: 1997b, ‘Base–cation deposition in Europe – Part II. Acid neutralization capacity and contribution to forest nutrition’, Atmos. Environ. 31, 4159–4168.
Driscoll, C. T., Lawrence, C. B., Bulger, A. J., Butler, T. J., Cronan, C. S., Eagar, C., Lambert, K. F., Likens, G. E., Stoddard, J. L. and Weathers, K. C.: 2001, ‘Acidic deposition in the northeastern United States: sources and inputs, ecosystem effects, and management strategies’, BioScience 51, 180–198.
Driscoll, C. T., Postek, K. M., Kretser, W. and Raynal, D. J.: 1995, ‘Long-term trends in the chemistry of precipitation and lake water in the Adirondack region of New York, U.S.A.’, Water, Air, Soil Pollut. 85, 583–588.
Duchesne, L., Ouimet, R. and Houle, D.: 2002, ‘Basal area growth of sugar maple in relation to acid deposition, stand health, and soil nutrients’, J. Environ. Qual. 31,1676–1683.
Edwards, P. J., Gregory, J. D. and Lee, A. H.: 1999, ‘Seasonal sulfate deposition and export patterns for a small Appalachian watershed’, Water, Air, Soil Pollut. 110, 137–155.
Eimers, M. C., Dillon, P. J. and Watmough, S. A.: 2004, ‘Long-term (18-year) changes in sulphate concentrations in 2 Ontario headwater lakes and their inflows in response to decreasing deposition and climate variations’, Hydrol. Process. 18, 2617–2630.
Eimers, M. C. and Dillon, P. J.: 2002, ‘Climate effects on sulphate flux from forested catchments in south-central Ontario’, Biogeochem. 61, 337–355.
EMEP.: 2001, ‘Transboundary Acid Deposition in Europe. EMEP Summary Report 2001’, EMEP/CCC and MSC-W Report 1/2001, Norwegian Meteorological Institute, Oslo, Norway.
Erisman, J., Grennfelt, P. and Sutton, M.: 2003, ‘The European perspective on nitrogen emission and deposition’. Environ. Internat. 29, 311–325.
Evans, C. D., Cullen, J. M., Alewell, C., Marchetto, A., Moldan, F., Kopáĉek, J., Prechtel, A., Rogora, M., Vesely, J. and Wright, R.: 2001, ‘Recovery from acidification in European surface Waters’, Hydrol. Earth Syst. Sci. 5, 283–298.
Fernandez, I. J., Rustad, L. E., Norton, S. A., Kahl, J. S. and Cosby, B. J.: 2003, ‘Experimental acidification causes soil base cation depletion in a New England forested watershed’, Soil Sci. Soc. Am. J. 67, 1909–1919.
Forsius, M., Kleemola, S., Vuorenmaa, J. and Syri, S.: 2001, ‘Fluxes and trends of nitrogen and sulphur compounds at integrated monitoring sites in Europe’, Water, Air, Soil Pollut. 130, 1641– 1648.
Foster, N. W., Mitchell, M. J., Morrison, I. K. and Shepard, J. P.: 1992, ‘Cycling of acid and base cations in deciduous stands of Huntington Forest, New York, and Turkey Lakes, Ontario’, Can. J. For. Res. 22, 167–174.
Gimeno, L., Marin, E., del Teso, T. and Bourhim, S.: 2001, ‘How effective has been the reduction of SO2 emissions on the effect of acid rain on ecosystems?’, Sci. Tot. Environ. 275, 63–70.
Gundersen, P., Callesen, I. and de Vries, W.: 1998, ‘Nitrate leaching in forest ecosystems is controlled by forest floor C/N ratio’, Environ. Pollut. 102, 403–407.
Harriman, R., Watt, A. W., Christie, A. E. G., Collen, P., Moore, D. W., McCartney, A. G., Taylor, E. M. and Watson, J.: 2001, ‘Interpretation of trends in acidic deposition and surface water chemsitry in Scotland during the past three decades’, Hydrol. Earth Syst. Sci. 5, 407–420.
Hedin, L. O., Granat, L., Likens, G. E., Buishand, T. A., Galloway, J. N., Butler, T. J. and Rodhe, H.: 1994, ‘Steep declines in atmospheric base cations in regions of North America’, Nature 367, 351–354.
Henriksen, A., Hindar, A., Hessen, D. O. and Kaste, O.: 1997, ‘Contribution of nitrogen to acidity in the Bjerkreim River in southwestern Norway’, Ambio 26, 304–311.
Hirsch, R. M. and Slack, J. R.: 1984, ‘A nonparametric trend test for seasonal data with serial dependence’, Wat. Resour. Res. 20, 727–732.
Hodson, M. E. and Langan, S. J.: 1999, ‘Considerations of uncertainty in setting critical loads of acidity of soils: The role of weathering rate determination’, Environ. Pollut. 106, 73–81.
Horsley, S. B., Long, R. P., Bailey, S. W., Hallett, R. A. and Hall, T. J.: 2000, ‘Factors associated with the decline disease of sugar maple on the Allegheny Plateau’, Can. J. For. Res. 30, 1365–1378.
Houle, D., Paquin, R., Camire, C., Ouimet, R. and Duchesne, L.: 1997, ‘Response of the Lake Clair watershed (Duchesnay, Quebec) to changes in precipitation chemistry (1988–1994)’, Can. J. For. Res. 27, 1813–1821.
Houle, D. and Carignan, R.: 1995, ‘Role of SO4 adsorption and desorption in the long–term S budget of a coniferous catchment on the Canadian Shield’, Biogeochem. 28, 162–182.
Ito, M., Mitchell, M. J. and Driscoll, C. T.: 2002, ‘Spatial patterns of precipitation quality and chemistry and air temperature in the Adirondack region of New York’, Atmos. Environ. 36, 1051–1062.
Jandl, R., Alewell, C. and Prietzel, J.: 2004, ‘Ca loss in Central European forest soils’, Soil Sci. Soc. Am. J. 68, 588–595.
Jefts, S., Fernandez, I. J., Rustad, L. E. and Dail, B.: 2004, ‘Decadal responses in soil N dynamics at the Bear Brook Watershed in Maine U.S.A.’, For. Ecol. and Manage. 189, 189–205.
Jiang, M. and Jagels, R.: 1999, ‘Detection and quantification of changes in membrane-associated calcium in red spruce saplings exposed to acid fog’, Tree Physiol. 19, 909–916.
Johnson, C. E., Driscoll, C. T., Siccama, T. G. and Likens, G. E.: 2000, ‘Element fluxes and landscape position in a northern hardwood forest watershed ecosystem’, Ecosystems 3, 159–184.
Keller, W., Dixit, S. S. and Heneberry, J.: 2001, ‘Calcium declines in northeastern Ontario lakes’, Can. J. Fish. Aquat. Sci. 58, 2011–2020.
Kirchner, J. W. and Lydersen, E.: 1995, ‘Base cation depletion and potential long-term acidification of Norwegian catchments’, Environ. Sci. Technol. 29, 1953–1960.
Kirchner, J. W., Dillon, P. J. and LaZerte, B.D.: 1992, ‘Predicted response of stream chemistry to acid loading tested in Canadian catchments’, Nature 358, 478–482.
Kolb, T. E. and McCormick, L.H.: 1993, ‘Etiology of sugar maple decline in four Pennsylvania stands’, Can. J. For. Res. 23, 2395–2402.
Kolka, R. K., Grigal, D. F. and Nater, E. A.: 1996, ‘Forest soil mineral weathering rates: Use of multiple approaches’, Geoderma 73, 1–21.
Kopacek, J., Vesely, J. and Stuchlik, E.: 2001, ‘Sulphur and nitrogen fluxes and budgets in the Bohemian Forest and Tatra Mountains during the Industrial Revolution (1850–2000)’, Hydrol. Earth Syst. Sci. 5, 391–405.
Lamersdorf, N. P., Beier, C., Blanck, K., Bredemeier, M., Cummins, T., Farrell, E. P., Kretzer, K., Rasmussen, L., Ryan, M., Weis, W. and Xu, Y. J.: 1998, ‘Effect of drought experiments using roof installations on acidification/nitrification of soils’, For. Ecol. Manage. 101, 95–109.
Langan, S. J., Reynolds, B. and Bain, D. C.: 1996, ‘The calculation of base cation release from mineral weathering in soils derived from Palaeozoic greywackes and shales in upland UK’, Geoderma 69, 275–285.
Larssen, T., Clarke, N., Tørseth, K. and Skjelkvåle, B. L.: 2002, ‘Prognoses for future acidification recovery of water, soils and forests: Dynamic modeling of Norwegian data from ICP Forests, ICP IM and ICP Waters’, SNO 4577-2002, Norwegian Institute for Water Research, Oslo. p. 38.
Lawrence, G. B., Lovett, G. M. and Baevsky, Y. H.: 2000, ‘Atmospheric deposition and watershed nitrogen export along an elevational gradient in the Catskill Mountains, New York’, Biogeochem. 50, 21–43.
Lawrence, G. B., David, M. B., Bailey, S. W. and Shortle, W. C.: 1997, ‘Assessment of soil calcium status in red spruce forests in the northeastern United States’, Biogeochem. 38, 19–39.
LaZerte, B. D. and Scott, L.: 1996, ‘Soil water leachate from two forested catchments on the Precambrian Shield’, Can. J. For. Res. 26, 1353–1365.
Likens, G. E., Driscoll, C. T. and Buso, D. C.: 1996, ‘Long-term effects of acid rain: Response and recovery of a forest ecosystem’, Science 272, 244–246.
Lofgren, S., Bringmark, L., Aastrup, M., Hultberg, H., Kindbom and Kvarnas, H.: 2001, ‘Sulphur balances and dynamics in three forested catchments in Sweden’, Water, Air, Soil Pollut. 130, 631–636.
Lokke, H., Bak, J., Falkengren-Grerup, U., Finlay, R. D., Ilvensniemi, H., Nygaard, P.H. and Starr, M.: 1996, ‘Critical loads of acidic deposition for forest soils: Is the current approach adequate?’, Ambio 25, 510–516.
Lovett, G. M., Weathers, K. C. and Arthur, M. A.: 2002, ‘Control of nitrogen loss from forested watersheds by soil carbon:nitrogen ratio and tree species composition’, Ecosystems 5, 712–718.
Lovett, G. M., Weathers, K. C. and Sobczak, W. V.: 2000, ‘Nitrogen saturation and retention in forested watersheds of the Catskill Mountains, New York’, Ecol. Appl. 10, 73–84.
Miller, E. K., Blum, J. D. and Friedland, A. J.: 1993, ‘Determination of soil exchangeable-cation loss and weathering rates using Sr isotopes’, Nature 362, 438–441.
Mitchell, M. J., Driscoll, C. T., Kahl, J. S., Likens, G. E., Murdoch, P. S. and Pardo, L. H.: 1996, ‘Climatic control of nitrate loss from forested watersheds in the northeast United States’, Environ. Sci. Technol. 30, 2609–2612.
Mitchell, M. J., Raynal, D. J. and Driscoll, C. T.: 1992, ‘Biogeochemistry of a forested watershed in the central Adirondack Mountains: Temporal changes and mass balances’, Water, Air, Soil Pollut. 88, 355–369.
Moldan, F., Skeffington, R. A., Morth, C. M., Torssander, P., Hultberg, H. and Munthe, J.: 2004, ‘Results from the covered catchment experiment at Gardsjon, Sweden, after ten years of clean precipitation treatment’ Water, Air, Soil Pollut. 154, 371–384.
Moritz, K., Bittersohl, J., Müller, F. X. and Krebs, M.: 1994, ‘Auswirkungen des Sauren Regens und des Waldsterbens auf das Grundwasser, Dokumentation der Methoden und Meß daten des Entwicklungsvorhabens 1988–1992’. Bayer. Landesamt für Wasserwirtschaft, München, Eigenverlag, Materialien Nr. 40.
NEG/ECP Forest Mapping Group.: 2001, ‘Critical load of sulphur and nitrogen assessment and mapping protocol for upland forests’, New England Governors and Eastern Canadian Premiers, Acid Rain Action Plan, Halifax, Canada.
Nilsson, P. and Grennfelt, J: 1988, ‘Critical loads for sulphur and nitrogen’, Nordic Council of Ministers, Copenhagen, Denmark.
Norton, S. A. and Fernandez, I. J.: 1999 (eds.).: 1999, The Bear Brook Watershed in Maine – A Paired Watershed Experiment – The First Decade (1987–1997), Kluwer Academic Publishers. Boston. p. 250.
Park, J. H., Mitchell, M. J., McHale, P. J., Christopher, S. F. and Myers, T. P.: 2003, ‘Impacts of changing climate and atmospheric deposition on N and S drainage losses from a forested watershed of the Adirondack Mountains, New York State’, Global Change Biol. 9, 1602–1619.
Posch, M., de Smet, P. A. M., Hettelingh, J. P. and Downing, R. J.: 2001, ‘Calculation and mapping of critical thresholds in Europe’, Status Report 1995, Coordination Center for Effects, Bilthoven, the Netherlands, RIVM Report No. 259101004, ISBN No. 90-6960-060-9.
Prechtel, A., Alewell, C., Armbruster, M., Bittersohl, J., Cullen, J. M., Evans, C. D., Helliwell, R., Kopacek, J., Marchetto, A., Matzner, E., Meesenburg, H., Moldan, F., Moritz, K., Vesely, J. and Wright, R. F.: 2001, ‘Response of sulphur dynamics in European catchments to decreasing sulphate deposition’, Hydrol. Earth Syst. Sci. 5, 311–325.
Raper, D. W. and Lee, D. S.: 1996, ‘Wet deposition at the sub-20 km scale in a rural upland area of England’, Atmos. Environ. 30, 1193–1297.
Sah, S. P. and Meiwes, K. J.: 1993, ‘Sulfur input and outputs for two European beech forests growing on different soil substrates’, Can. J. For. Res. 23, 1626–1630.
Schiff, S. L., Devito, K. J., Elgood, R. J., McCrindle, P. M., Spoelstra, J. and Dillon, P. J.: 2002, ‘Two adjacent forested catchments: Dramatically different NO3− export’, Wat. Resour. Res. 38, 1292–1305.
Sen, P. K.: 1968, ‘Estimates of the regression coefficient base on Kendall's Tau’, J. Amer. Statis. Assn. 63, 1379–1389.
Shepard, J. P., Mitchell, M. J., Scott, T. J., Zhang, Y. M. and Raynal, D. J.: 1989, ‘Measurements of wet and dry deposition in a northern hardwood forest’, Water, Air, Soil Pollut. 48, 225– 238.
Shortle, W. C., Smith, K. T., Minocha, R. and Alexeyev, V. A.: 1995, ‘Similar patterns of change in stemwood calcium in red spruce and Siberian fir’, J. Biogeog. 22, 467–473.
Shortle, W. C. and Smith, K. T.: 1988, ‘Aluminium-induced calcium deficiency syndrome in declining red spruce’, Science 240, 1017–1018.
Skeffington, R. A.: 1999, ‘The use of critical loads in environmental policy making: A critical appraisal’, Environ. Sci. Technol. 33, 245–252.
Stainton, M. P., Capel, M. J. and Armstrong, F. A. J.: 1977, The Chemical Analysis of Fresh Water, 2nd edn. Can. Fish. Mar. Serv. Misc. Spec. Publ. 25: p. 180.
Starr, M., Lindroos, A. J., Tarvainen, T. and Tanskanen, H.: 1998, ‘Weathering rates in the Hietajarvi Integrated Monitoring Catchment’, Boreal Environ. Res. 3, 275–285.
Stoddard, J. L., Traaen, T. S. and Skjelkvale, B. L.: 2001, ‘Assessment of nitrogen leaching at ICP-Waters sites (Europe and North America)’, Water, Air, Soil Pollut. 130, 781–786.
Stoddard, J. L., Jeffries, D. S., Lukewille, A., Claire, T. A., Dillon, P. J., Driscoll, C. T., Forsius, M., Johannessen, M., Kahl, J. S., Kellogg, J. H., Kemp, A., Mannio, J., Monteith, D. T., Murdoch, P.~S., Patrick, S., Rebsdorf, A., Skjelkuale, B. L., Stainton, M. P., Traaen, T., Dam, van H., Webster, K. E., Wieting, J., Wilander, A.: 1999, ‘Regional trends in aquatic recovery from acidification in North America and Europe’, Nature 401, 575–578.
Sverdrup, H., Warfvinge, P. and Wickman, T.: 1998, ‘Estimating the Weathering Rate at Gardsjon Using Different Methods. in: H. Hultberg and R. Skeffington (Eds.), Experimental Reversal Of Acid Rain Effects: The Gardsjon Roof Project’ Wiley, U.K., pp 231–249.
Tomlinson, G. H.: 2003, ‘Acidic deposition, nutrient leaching and forest growth’, Biogeochem. 65, 51–81.
Torseth, K., Hanssen, J. E. and Semb, A.: 1999, ‘Temporal and spatial variations in airborne Mg, Cl, Na, Ca and K in rural areas of Norway’, Sci. Tot. Environ. 234, 75–85.
Warfvinge, P. and Sverdrup, H.: 1992, ‘Calculating critical loads of acid deposition with PROFILE: A steady-state soil chemistry model’, Water, Air, Soil Pollut. 63, 119–143.
Watmough, S. A. and Dillon, P. J.: 2004, ‘Major element fluxes from a coniferous catchment in central Ontario, 1983–1999’, Biogeochem. 67, 369–398.
Watmough, S. A., Eimers, M. C., Aherne, J. and Dillon, P. J.: 2004, ‘Climate effects on nitrate export from forested catchments in south-central Ontario’, Environ. Sci. Technol. 38, 2383–2388.
Watmough, S. A. and Dillon, P. J.: 2003a, ‘Calcium losses from a forested catchment in south central Ontario, Canada’, Environ. Sci. Technol. 37, 3085–3089.
Watmough, S. A. and Dillon, P. J.: 2003b, ‘Base cation and nitrogen budgets for seven forested catchments in south-central Ontario, 1983–1999’, For. Ecol. Manage. 177, 155–177.
Watmough, S. A. and Dillon, P. J.: 2003c, ‘Base cation and nitrogen budgets for a mixed hardwood catchment in south-central Ontario’, Ecosystems 6, 675–693.
Watmough, S. A., Aherne, J. and Dillon, P. J.: 2003, ‘The potential impact of harvesting on lake chemistry in south-central Ontario at current levels of acid deposition’, Can. J. Fish. Aquat. Sci. 60, 1095–1103.
Watmough, S. A.: 2002, ‘A dendrochemical survey of sugar maple in south-central Ontario’, Water, Air, Soil Pollut. 136, 165–187.
Wright, R. F., Alewell, C., Cullen, J., Evans, C. D., Marchetto, A., Moldan, F., Prechtel, A. and Rogora, M.: 2001, ‘Trends in nitrogen deposition and leaching in acid-sensitive streams in Europe’, Hydrol. Earth Syst. Sci. 5, 299–310.
Wright, R. F. and Jenkins, A.: 2001, ‘Climate change as a confounding factor in reversibility of acidification: RAIN and CLIMEX projects’, Hydrol. Earth Syst. Sci. 5, 477–486.
Yanni, S., Keys, K., Meng, F. -R., Yin, X., Clair, T. and Arp P.: 2000, ‘Modelling hydrological conditions in the maritime forest region of south western Nova Scotia’, Hydrol. Process. 14, 195–214.
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Watmough, S.A., Aherne, J., Alewell, C. et al. Sulphate, Nitrogen and Base Cation Budgets at 21 Forested Catchments in Canada, the United States and Europe. Environ Monit Assess 109, 1–36 (2005). https://doi.org/10.1007/s10661-005-4336-z
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DOI: https://doi.org/10.1007/s10661-005-4336-z