Abstract
Agriculture is the largest source of nutrients into surface waters in Finland, and yet relatively little is known about the actual impact of the agricultural load on the state of lakes. We analysed the water quality data of 20 Finnish agricultural lakes and found that they had higher levels of nutrients, chlorophyll a and turbidity than did the other types of lakes (e.g. those receiving point-source load) in the national monitoring network (the Finnish Eurowaternet). Currently, six of the agricultural lakes can be classified as eutrophic and 14 as hypertrophic. Trend analysis (based on Kendall's tau-b) indicated that during 1976–2002 the water quality of the lakes either remained constant or showed signs of increasing eutrophication and elevated turbidity. Decreasing nutrient concentrations were found only in one intensively restored lake. In none of the lakes had the chlorophyll a concentration decreased. The results of the trend analysis are compatible with the recent finding that, despite vigorous efforts, the nutrient load from agriculture has not declined in Finland. Recovery of the most eutrophied agricultural lakes would call for a drastic reduction in the external nutrient load, possibly supplemented with in-lake restoration.
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References
Antikainen, S., Puupponen, M., Vuoristo, H. and Seuna, P.: 1996, ‘Surface water monitoring networks inFinland’, EurAqua: Optimizing Freshwater Data Monitoring Networks Including Links with Modelling. Second technical review. Paris, La Defence, October 18–20, 1995, pp. 51–59.
Antikainen, S., Joukola, M. and Vuoristo, H.: 2000, ‘Water quality in Finland in the mid-1990s’, Vesitalous 41, 47–53. (In Finnish with an English abstract.)
Anttila, V.: 1967, ‘Järvenlaskuyhtiöt Suomessa: kansatieteellinen tutkimus’, Kansatieteellinen arkisto 19, Suomen muinaismuistoyhdistys. (In Finnish.)
Arbuckle, K. E. and Downing, J. A.: 2001, ‘The influence of watershed land use on lake N:P in apredominantly agricultural landscape’, Limnol. Oceanogr. 46, 970–975.
ArcView GIS 3.2a: 1992–2000, Environmental Systems Research Institute, Inc., Redlands, CA, USA.
Berge, D., Bechmann, M. and Vandsemb, S. M.: 2001, ‘JOVÅ — Overvåking av jordbruksvirkede innsjóer 2000. Tiltaksgjennomfó ring, vannkvalitetstilstand og —utvikling’, Norsk institutt for vannforsking,Oslo. Rapport 0-95025.
Brown, C. D., Hoyer, M. V., Bachmann, R. W. and Canfield, D. E., Jr.: 2000, ‘Nutrient-chlorophyllrelationships: An evaluation of empirical nutrient-chlorophyll models using Florida and north-temperatelake data’, Can. J. Fish. Aquat. Sci. 57, 1574–1583.
Carpenter, S. R., Caraco, N. F., Correll, D. L., Howarth, R. W., Sharpley, A. N. and Smith, V. H.: 1998, ‘Nonpoint pollution of surface waters with phosphorus and nitrogen’, Ecol. Appl. 8, 559–568.
Commonwealth of Australia: 2001, ‘Inland Waters Theme Report — Australia State of the Environment Report2001’, CSIRO Publishing on behalf of the Department of the Environment and Heritage, http://www.deh.gov.au/soe/2001/.
DEFRA: 2002, ‘The governments strategic review of diffuse water pollution from agriculture in England:Agriculture and water: A diffuse pollution review’, Department for Environment, Food and Rural Affairs,UK.
EC: 2000, ‘Directive 2000/60/EC of the European Parliament and of the Council of 23 October 2000establishing a framework for Community action in the field of water policy’, Off. J. Eur.Communities L327, 1–73.
EEC: 1991, ‘Council directive of 12 December 1991 concerning the protection of waters against pollutioncaused by nitrates from agricultural sources (91/676/EEC)’, Off. J. Eur. Communities L375, 1–8.
EEC: 1992, ‘Council Regulation (EEC) No 2078/92 of 30 June 1992 on agricultural production methodscompatible with the requirements of the protection of the environment and the maintenance of thecountryside’, Off. J. Eur. Communities L215, 85–90.
Ekholm, P.: 1994, ‘Bioavailability of phosphorus in agriculturally loaded rivers in southern Finland’, Hydrobiologia 287, 179–194.
Ekholm, P., Malve, O. and Kirkkala, T.: 1997, ‘Internal and external loading as regulators of nutrientconcentrations in the agriculturally loaded Lake Pyhäjärvi (southwest Finland)’, Hydrobiologia 345, 3–14.
European Environmental Agency: 2003a, ‘Europe's water: An indicator-based assessment. Summary’, Environmental Issue Report 34, Office for Official Publications of the European Communities, Luxembourg.
European Environmental Agency: 2003b, ‘Europe's environment: the third assessment.’ Environmental Assessment Report 10, Office for Official Publications of the European Communities, Luxembourg.
Forsberg, C. and Ryding, S.-O.: 1980, ‘Eutrophication parameters and trophic state indices in 30 Swedishwaste-receiving lakes’, Arch. Hydrobiol. 89, 189–207.
Granlund, K., Räike, A., Ekholm, P., Rankinen, K. and Rekolainen, S.: 2004, ‘Assessment of waterprotection targets for agricultural nutrient loading in Finland’, J. Hydrol. 304, 251–260.
Irvine, K., Free, G., de Eyto, E., White, J., Allott, N. and Mills, P.: 2001, ‘The EC Water FrameworkDirective and monitoring lakes in the Republic of Ireland’, Freshwater Forum 16, 48–64.
Isermann, K.: 1990, ‘Share of agriculture in nitrogen and phosphorus emissions into the surface waters of Western Europe against the background of their eutrophication’, Fert. Res. 26, 253–269.
Itkonen, A. and Olander, H.: 1997, ‘The origin of the hypertrophic state of a shallow boreal shield lake’, Boreal Environ. Res. 2, 183–198.
Kauppi, L.: 1984, ‘The contribution of agricultural loading to eutrophication in Finnish lakes’, Wat. Sci. Technol. 17, 1133–1140.
Kauppi, L., Rekolainen, S. and Knuuttila, S.: 1988, ‘Nutrients and phytoplankton production in anagriculturally loaded lake’, Ecol. Bull. 39, 149–150.
Kauppi, L., Knuuttila, S., Sandman, K., Eskonen, K., Luokkanen, S. and Liehu, A.: 1990a, ‘Role of landusein the occurrence of blue-green algal blooms’, Verh. Internat. Verein. Limnol. 24, 671–676.
Kauppi, L., Sandman, O., Knuuttila, S., Eskonen, K., Liehu, A., Luokkanen, S. and Niemi, M.: 1990b, ‘Maankäytön merkitys vesien käytölle haitallisten sinileväkukintojenesiintymisessä’, Vesi- ja ympäristöhallituksen julkaisuja — Sarja A 48, Vesi-jaympäristöhallitus, Helsinki.
Koskiaho, J., Ekholm, P., Riihimäki, J. and Puustinen, M.: 2003, ‘Retaining agricultural nutrients inconstructed wetlands — experiences under boreal conditions’, Ecol. Eng. 20, 91–105.
Knuuttila, S., Pietiläinen, O.-P. and Kauppi, L.: 1994, ‘Nutrient balances and phytoplankton dynamicsin two agriculturally loaded shallow lakes’, Hydrobiologia 275/276, 359–369.
Krogerus, K. and Ekholm, P.: 2003, ‘Phosphorus in settling matter and bottom sediments in lakes loaded byagriculture’, Hydrobiologia 492, 15–28.
Kronvang, B., Ærteberg, G., Grant, R., Kristensen, P., Hovmand, M. and Kirkegaard, J.: 1993,‘Nationwide monitoring of nutrients and their ecological effects: State of the Danish aquaticenvironment’, Ambio 22, 176–187.
Kukkonen, E. and Tynni, R.: 1970, ‘Die Entwicklung des Sees Pyhäjärvi in Südfinnland imLichte von Sediment- und Diatomeenuntersuchunge’, Acta Bot. Fenn. 90.
Laaksonen, R.: 1972, ‘Observations on lake deeps by the water authority in March 1965–1970’, Publications of the Water Research Institute 4, National Board of Waters, Helsinki. (In Finnishwith an English Abstract).
Mannio, J.: 2001, ‘Responses of headwater lakes to air pollution changes in Finland’, Monogr. BorealEnviron. Res. 18, Finnish Environment Institute, Helsinki.
Mannio, J., Räike, A. and Vuorenmaa, J.: 2000, ‘Finnish Lake Survey 1995: Regional characteristics oflake chemistry’, Verh. Internat. Verein. Limnol. 27, 362–367.
McCauley, E., Downing, J. A. and Watson, S.: 1989, ‘Sigmoid relationships between nutrients andchlorophyll among lakes’, Can. J. Fish. Aquat. Sci. 46, 1171–1175.
McGarrigle, M. L. and Champ, W. S. T.: 1999, ‘Keeping pristine lakes clean: Loughs Conn and Mask, westernIreland’, Hydrobiologia 395/396, 455–469.
Ministry of Agriculture and Forestry: 2004, ‘Horisontaalisen maaseudun kehittämisohjelmanväliarviointi. Manner-Suomi. (Mid-term evaluation of the Horizontal Rural Development programme.)’MMM:n julkaisuja 1/2004. Vammalan Kirjapaino Oy. [In Finnish with an English summary.]
Mitikka, S. and Ekholm, P.: 2003, ‘Lakes in the Finnish Eurowaternet: status and trends’, Sci. TotalEnviron. 310, 37–45.
Niemi, J., Heinonen, P., Mitikka, S., Vuoristo, H., Pietiläinen, O.-P., Puupponen, M. andRönkä, E. (eds): 2001, ‘The Finnish Eurowaternet with information about Finnish water resourcesand monitoring strategies’, The Finnish Environment 455. Finnish Environment Institute. Helsinki.
Nixon, S., Grath, J. and Bøgestrand, J.: 1998, ‘Eurowaternet—The European Environment Agency'smonitoring and information network for inland water resources’, Technical Guidelines for Implementation,Technical Report 7, European Environment Agency, Copenhagen.
Puustinen, M., Turtola, E. and Tattari, S.: 2004, ‘Leudot talvet ja peltoviljely’. Vesitalous 3/2004, 17–21. [In Finnish].
Prairie, Y. T., Duarte, C. M. and Kalff, J.: 1989, ‘Unifying nutrient-chlorophyll relationships in lakes’,Can. J. Fish. Aquat. Sci. 46, 1176–1182.
Räike, A., Pietiläinen, O.-P., Rekolainen, S., Kauppila, P., Pitkänen, H., Niemi, J.,Raateland, A. and Vuorenmaa, J.: 2003, ‘Trends of phosphorus, nitrogen and chlorophyll aconcentrations in Finnish rivers and lakes in 1975–2000’, Sci. Total Environ. 310, 47–59.
Räsänen, M., Salonen, V.-P., Salo, J., Walls, M. and Sarvala, J.: 1992, ‘Recent history ofsedimentation and biotic communities in Lake Pyhäjärvi, SW Finland’, J. Paleolimnol. 7, 107–126.
Räsänen, J., Kauppila, T., and Salonen, V.-P.: 2004, ‘Sediment-based investigation of naturallyeutrophic lakes - implications for lake management’, J. Environ. Manage. (submitted).
Rekolainen, S., Ekholm, P., Ulén, B. and Gustafson, A.: 1997, ‘Phosphorus losses from agriculture tosurface waters in the Nordic countries’, in: H. Tunney, O. T. Carton, P. C. Brookes and A. E. Johnston(eds), Phosphorus Loss from Soil to Water, CAB International, Wallingford, UK, pp. 77–93.
Salonen, V.-P., Alhonen, P., Itkonen, A. and Olander, H.: 1993, ‘The trophic history of Enäjärvi,SW Finland, with special reference to its restoration problems’, Hydrobiologia 268, 147–162.
Särkkä, M.: 1972, ‘The washing out of nutrients in the watersheds’, Aqua Fenn. 2, 88–103.
SAS System for Windows: 1999–2000, OnLineDoc®. Release 8.01. SASInstitute Inc., Cary, NC, USA.
Smith, V.: 1983, ‘Low nitrogen to phosphorus ratios favor dominance by blue-green algae in lakephytoplankton’, Nature 221, 669–671.
Søndergaard, M., Jensen, J. P. and Jeppesen, E.: 1999, ‘Internal phosphorus loading in shallow Danishlakes’, Hydrobiologia 408/409, 145–152.
Turtola, E. and Paajanen, A.: 1995, ‘Influence of improved subsurface drainage on phosphorus losses andnitrogen leaching from a heavy clay soil’, Agr. Water Manage. 28, 295–310.
Uusitalo, R., Yli-Halla, M. and Turtola, E.: 2000, ‘Suspended soil as a source of potentiallybioavailable phosphorus in surface runoff waters from clay soils’, Water Res. 34, 2477–2482.
Vollenweider, R. A. and Kerekes, J. J.: 1980, ‘Synthesis Report, Cooperative Programme on monitoring ofInland Waters (Eutrophication Control)’, Reports prepared on behalf of Technical Bureau, Water ManagementSector Group, Organization for Economic Cooperation and Development (OECD), Paris.
Vuorenmaa, J., Rekolainen, S., Lepistö, A., Kenttämies, K. and Kauppila, P.: 2002, ‘Losses ofnitrogen and phosphorus from agricultural and forest areas in Finland during the 1980s and 1990s’, Environ. Monit. Assess. 76, 213–248.
Vuoristo, H.: 1998, ‘Water quality classification of Finnish inland waters’, Eur. Water Manage. 6, 35–41.
Zar, J. H.: 1999, ‘Biostatistical Analysis’, Fourth edition, Prentice-Hall International, London.
Zhou, Q., Gibson, C. E. and Foy, R. H.: 2000, ‘Long-term changes of nitrogen and phosphorus loadings to alarge lake in north-west Ireland’, Water Res. 34, 922–926.
Yli-Halla, M., Hartikainen, H., Ekholm, P., Turtola, E., Puustinen, M. and Kallio, K.: 1995, ‘Assessmentof soluble phosphorus load in the surface runoff by soil analyses’, Agric. Ecosyst. Environ. 56, 53–62.
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Ekholm, P., Mitikka, S. Agricultural Lakes in Finland: Current Water Quality and Trends. Environ Monit Assess 116, 111–135 (2006). https://doi.org/10.1007/s10661-006-7231-3
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DOI: https://doi.org/10.1007/s10661-006-7231-3