Phosphorus transfer from agricultural areas and its impact on the eutrophication of lakes—two long-term integrated studies from Norway

Bechmann, Marianne; Berge, D.; Eggestad, Hans; Vandsemb, S.M.

doi:10.1016/j.jhydrol.2004.07.032

Cited by 65 publications

(37 citation statements)

References 21 publications

(20 reference statements)

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“…Excessive, usually anthropogenic, pressure of the catchment inevitably leads to permanent disruption of lake biogeocenosis which, in turn, results in rapid qualitative transformation of the aquatic environment, i.e. degradation (BajkiewiczGrabowska 2002;Bechmann et al 2005;Borowiak and Maślanka 2007;Ptak et al 2013).…”

Section: Resultsmentioning

confidence: 99%

“…This particularly applies to lakes which are excessively supplied with nutrients -they undergo eutrophication (Vollenweider 1968(Vollenweider , 1976Jonge et al 2002;Kubiak and Tórz 2005). Urbanisation, industrialisation, intensive agricultural production and considerable tourism development coupled with insufficient methods of protection result in excessive anthropopressure and external loading with phosphorus and nitrogen (Vollenweider 1968;1976;Lossow 1996, 1998, Kubiak 2003, Bechmann et al 2005Kubiak and Tórz 2006;Neal and Heathwaite 2005;Kato et al2009). The load of these elements delivered to lakes often exceeds levels considered dangerous (Vollenweider 1968;Kubiak 2003;Neal and Heathwaite 2005;Kato et al 2009).…”

Section: Introductionmentioning

confidence: 99%

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Anthropogenic pressure on the largest lakes of the River Tywa catchment

Kubiak

Machula

Oszkinis³

et al. 2017

Limnological Review

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Abstract:The largest lakes of the River Tywa basin i.e. Strzeszowskie, Dołgie, Swobnica and Dłużec (north-west Poland, West Pomeranian Lakeland) were studied in the period 2008-2013, usually in a six week cycle. The aim of the study was to determine the degree of anthropogenic pressure on the lakes. Anthropogenic pressure was assessed against the natural vulnerability of lakes to degradation and the actual rate of eutrophication, with particular consideration of the catchment areas. Catchments of the studied lakes were classified as III class -catchment with moderate possibility of matter supply to lakes. Lakes Swobnica and Dłużec are characterised by low resistance to degradation. Lake Strzeszowskie is categorised as having moderate resistance and Lake Dołgie is non-resistant to degradation and highly susceptible to external pressure. The rate of eutrophication of lakes Strzeszowskie and Dłużec was found to be moderate, whereas lakes Dołgie and Swobnica show a high rate of eutrophication. The analysis of nutrient loading reaching the waters of the aforementioned lakes shows that the main area source is arable land, and the fundamental point source is the inflow of river waters to each of the analysed reservoirs. Nutrient loading supplied by the river is several times higher than area load. Such conditions require protective action to be taken within the catchment area and particularly, intensive implementation of good agricultural practice. In the studied lakes, there is a significant predominance of incoming nutrient loadings over dangerous and admissible loads.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Anthropogenic pressure on the largest lakes of the River Tywa catchment

Kubiak

Machula

Oszkinis³

et al. 2017

Limnological Review

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“…As stated above, P has been pointed out by numerous authors [10,[23][24][25], including the WFD, as a key nutrient for addressing water eutrophication derived from diffuse nutrient loss from agriculture. However, this is a hard task considering the complexity of the processes involved in the delivery of P to freshwaters [15].…”

Section: Assessment Methodsmentioning

confidence: 96%

“…For example, the measurement method could provide an accurate assessment of nutrient delivery at a catchment scale as long as analytical equipment was available in representative sample sites [23]. Unfortunately, this is not always possible as monitoring is expensive and time consuming.…”

Section: Assessment Methodsmentioning

confidence: 99%

The Potential of P Loss from Livestock Farms to Watercourses in Wensleydale; A Risk Mapping Approach

G¹

2015

Forest Res

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Hydrologic, chemical and physical factors controlling P export from 10 livestock farms located in Wensleydale were considered in order to estimate the risk of P loss to surface waters in a Non Nitrate Vulnerable Zone (non NVZ). Phosphorus source factors were obtained from a farm investigation questionnaire as well as from soil analysis results. Transport factors were examined using a GIS as a tool to implement a predictive model of delivery of P to watercourses. The classification of grassland into different risk categories was carried out using the Pennsylvanian P Index in a GIS. Finally, this risk assessment has yielded that non NVZ areas can pose a risk of breaching the Water Framework Directive (WFD) objectives. A wide range of mechanisms including voluntary schemes are needed in order to reach good ecological status of freshwaters by 2015 in the UK.

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“…Agriculture as a traditional stressor is characterized by transformed information of soil and land cover in the catchment area [1]. It is associated with the land fragility as contaminants disperse on the surface and into the ground.…”

Section: Methodsmentioning

confidence: 99%