Trends of phosphorus, nitrogen and chlorophyll a concentrations in Finnish rivers and lakes in 1975–2000

Räike, Antti; Pietiläinen, Olli-Pekka; Rekolainen, Seppo; Kauppila, Pirkko; Pitkänen, Heikki; Niemi, Jorma; Raateland, Arjen; Vuorenmaa, Jussi

doi:10.1016/s0048-9697(02)00622-8

Cited by 119 publications

(82 citation statements)

References 16 publications

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“…In addition, this is the closest point of entrance into the river, receiving significant contributions from the inflow areas. Two of the primary artificial sources of phosphorous are the domestic sewers and the agricultural fertilizers, as discussed by Shrestha and Kazama (2007), Castro and Mendonça (2004), Räike et al (2003) and Esteves (1998).…”

Section: Spatial-temporal Variationsmentioning

confidence: 99%

The water quality investigation using GIS and multivariable analysis in a semiarid region reservoir

Mithya¹,

Alexandre

Andrade

et al. 2010

Rev. Ciênc. Agron.

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-This study was carried out in the Serrote reservoir, sited in the Groaíras watershed at the northeastern region of Ceará State, Brazil. The aim was to investigate the temporal and spatial variability of water quality. Data investigation was processed using multivariate analysis/cluster analysis and GIS techniques. Samples were taken in four stations spreading out over the water body during five campaigns of collection (February, May, August/2007 and May, August/2008). The water quality parameters analyzed were: Electric Conductivity (EC), pH, Dissolved Oxygen (DO), temperature, chlorophyll 'a' concentration and Total Phosphorus (TP). Two homogeneous groups were identified, which expressed the inter-annual seasonality influence in the water quality. The highest concentration of investigated attributes occurred in 2008. At that year, the depth of the annual rainfall was 53% above the annual average. Chlorophyll 'a' and total phosphorus defined the dissimilarity between the two groups. Group 1 was composed with the better water quality and concentrations of attributes were close to the recommended limit defined by resolution 357/05 of CONAMA. Whereas Group 2 presented average concentrations of chlorophyll 'a' and total phosphorus two times greater than the ones registered in Group 1, there for been above the limit established by CONAMA (357/05) for human consumption. The reservoir presents characteristics that point toward eutrophization due to the use and management of the soil around said reservoir.Key words -Water quality. Cluster Analysis. Eutrophization.Resumo -Este estudo foi conduzido no açude Serrote (barragem Edson Queiroz), localizado na bacia do rio Groaíras, no norte do estado do Ceará, objetivando-se investigar a variabilidade espaço-temporal da qualidade da água. Foram coletadas amostras de água em quatro pontos do corpo hídrico, durante os meses de fevereiro, maio e agosto de 2007 e maio e agosto de 2008, totalizando cinco campanhas. Os parâmetros considerados neste estudo foram Condutividade Elétrica da água (CE), potencial hidrogeniônico (pH), oxigênio dissolvido (OD), temperatura (T), fósforo total (P) e clorofila 'a'. As investigações dos dados foram realizadas pelo emprego de análise multivariada (análise de agrupamento) e técnicas de geoprocessamento. Dois grupos homogêneos foram formados independentes do ponto de amostragem, expressando assim, a maior influência da sazonalidade interanual. O estudo mostrou que as maiores concentrações dos elementos investigados foram registrados no ano de 2008, que apresentou totais pluviométricos superiores a média normal em 53%. A dissimilaridade entre os dois grupos foi definida pela clorofila 'a' e o fósforo total. O grupo 1 apresentou águas de melhor qualidade, com concentrações em torno dos limites estabelecidos pelo CONAMA (357/05). Já o grupo 2 apresentou concentrações médias da clorofila 'a' e do fósforo total duas vezes superiores as registradas no grupo 1, estando as mesmas sempre superiores aos limites estabelecidos pelo CONAMA (357/05) p...

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Section: Spatial-temporal Variationsmentioning

confidence: 99%

The water quality investigation using GIS and multivariable analysis in a semiarid region reservoir

Mithya¹,

Alexandre

Andrade

et al. 2010

Rev. Ciênc. Agron.

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“…The slow response of diffuse loading in Nordic-Baltic river basins to changed land-use and agricultural practices has been clearly demonstrated, for example by Löfgren et al (1999), Vagstad et al (2001) and Räike et al (2003). A study by Vagstad et al (1997) on Norwegian agricultural catchments indicated that a major part of the leached N originated from the mineralisation of organic matter rather than that from applied fertilizers.…”

Section: Discussionmentioning

confidence: 97%

“…To date, studies in Finnish agricultural catchments and river basins have indicated no reduction of nutrient loads, even though massive efforts have been made towards environmentally sound management practices, especially by introducing the Finnish Agri-Environmental Programme in 1995 (FAEP, Valpasvuo-Jaatinen et al, 1997). Increasing trends in nitrogen N concentrations have been detected in southern and western Finland, especially in some rivers flowing through intensively cultivated agricultural areas (Räike et al, 2003;Granlund and Räike, 2004). According to Kauppila and Bäck (2001), the extent of eutrophied areas increased in the Gulf of Finland, the Archipelago Sea and the Bothnian Bay in the late 1980s, and the situation has not essentially changed during the 1990s.…”

Section: Introductionmentioning

confidence: 99%

Testing the INCA model in a small agricultural catchment in southern Finland

Granlund

Ранкинен

Lepistö³

2004

Hydrol. Earth Syst. Sci.

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Nutrient leaching from agricultural production is still recognised as a major environmental problem in Finland. To estimate agricultural nitrogen loading under changing land-use and climate conditions, the Integrated Nitrogen Model for Catchments (INCA) was applied in Savijoki, a small (15.4 km 2 ) agricultural catchment, which represents the intensively cultivated areas in south-western Finland. Hydrological calibration and testing of the INCA model was first carried out in Savijoki during 19812000. In spite of heterogeneous soil and land-use conditions, INCA was able to reproduce the overall hydrological regime in the stream. The model was calibrated further in respect of nitrogen processes during 19952000. The model was able, reasonably well, to simulate the overall annual dynamics of the inorganic N concentrations in the stream water and the annual N export from the catchment. The average simulated NO 3 -N export was 550 kg N km 2 yr 1 and the observed one (constituting more than half of the annual total N export) was 592 kg N km 2 yr 1 . For NH 4 -N, the simulated export was somewhat higher than that measured but NH 4 -N was only 4% of the total N export. In spite of some underestimation of flow and N concentration during extreme hydrological conditions, the INCA model proved to be a useful tool for analysing flow pattern and inorganic nitrogen leaching in a small agricultural catchment, characterised by a rapid response to rainfall.

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“…are subsidised. However, follow-up studies suggest that positive effects on the quality of natural waters are lacking until now (Räike et al 2003(Räike et al , 2004. This may be due to long-term accumulation of P and N in soil and sediments of lakes and rivers, inefficiency of the measures adopted within AEP or increased nutrient import to arable land caused by the gradual shift towards more intensive animal agriculture.…”

Section: A G R I C U L T U R a L A N D F O O D S C I E N C Ementioning

confidence: 99%

Nitrogen and phosphorus balances on Finnish dairy farms

Virtanen¹,

Nousiainen²

2008

AFSci

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The calculation of whole-farm nutrient balance is an effective and simple method for estimating the potential nutrient loading from dairy farming into the environment. In Finland, however, the published results based on larger number of farms are still lacking. In this study whole-farm nitrogen (N) and phosphorus (P) balances on Finnish dairy farms were studied based on short-cut data for the year 2002. The survey was targeted to 1260 dairy farms, located all over Finland. Of the 386 replies received, 319 were used for subsequent statistical analyses. The association between selected farm variables and nutrient balance was studied using regression analysis and a sensitivity coefficient was calculated for each regression slope. The average (± standard deviation) whole-farm nutrient balance for N and P was 109 (±41.3) and 12 (±7.2) kg ha -1 , respectively. The most responsive factors affecting the nutrient balances were total nutrient and fertilizer import per ha, followed by animal density, milk export per ha and concentrate import per ha. The results suggested that nutrient surpluses could be controlled more easily in combined crop and milk than in specialised milk production. It is concluded that nutrient surplus on Finnish dairy farms is markedly lower than that on areas with intensive production in central European countries. However, when nutrient balances were extrapolated to comparable production intensity as in central Europe, the level of the surpluses was equal.

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Trends of phosphorus, nitrogen and chlorophyll a concentrations in Finnish rivers and lakes in 1975–2000

Cited by 119 publications

References 16 publications

The water quality investigation using GIS and multivariable analysis in a semiarid region reservoir

The water quality investigation using GIS and multivariable analysis in a semiarid region reservoir

Testing the INCA model in a small agricultural catchment in southern Finland

Nitrogen and phosphorus balances on Finnish dairy farms

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