Estimated contribution of selected non-point pollution sources to the phosphorus and nitrogen loads in water bodies of the Vltava river basin
P. Rosendorf, P. Vyskoč, H. Prchalová, D. Fialahttps://doi.org/10.17221/15/2015-SWRCitation:Rosendorf P., Vyskoč P., Prchalová H., Fiala D. (2016): Estimated contribution of selected non-point pollution sources to the phosphorus and nitrogen loads in water bodies of the Vltava river basin. Soil & Water Res., 11: 196-204.
Eutrophication of inland waters by phosphorus as well as loads of coastal and marine waters by nitrogen is a major problem that impedes water bodies to meet the status defined by the Water Framework Directive. In order to reduce the nutrient load on the aquatic environment, first the significance of various pollution types should be thoroughly analyzed. The analysis of phosphorus runoff from agricultural land under normal rainfall-runoff conditions, and of nitrogen runoff associated with the application of manure on farmland shows their different impact on water body status in the Vltava river basin. The assessment of phosphorus indicates that annual specific phosphorus runoff ranges from 0.1 to 9.98 kg/km2 and in the sub-basins of the Upper Vltava, Berounka, and Lower Vltava, the average values from all water bodies reach 4.08, 2.92, and 4.02 kg/km2, respectively. Compared with the allowable capacity of water bodies for achieving a proper status, the average rate of phosphorus input on the load of water bodies comes within 20%, with a maximum value slightly exceeding 50%. This phosphorus input will not be a significant source of eutrophication of inland waters and measures will have to focus rather on other eutrophication sources. Estimating the significance of the impact of manure application on the nitrogen load of water bodies provides a completely opposite picture. The analyses showed that the load of water bodies ranges from very low values in areas without livestock to high loads in tens of kg/ha per year (max. 31.5 kg/ha/year). In the sub-basins of the Upper Vltava, Berounka, and Lower Vltava the annual specific runoff of nitrogen reaches average values for all water bodies (4.8, 3.9, and 5.7 kg/ha, respectively). The assessment of the proportion of nitrogen input on the load of water bodies showed that 25% of cases in the area of the water body may represent a critical load leading to an adverse assessment of ecological status. In many other water bodies it can, however, taking into account the load of mineral fertilizers, lead to exceeding the allowable capacity of water bodies and the risk of not achieving a right status. Nitrogen input after application of manure in soils represents an important source that threatens the right status of waters. Attention should thus be paid to all types of measures that will reduce the load of this source or restrict its transport from soil to waters.Keywords:
eutrophication; nutrients; Water Framework Directive; water qualityReferences:
Andersen Jesper H., Fossing Henrik, Hansen Jens W., Manscher Ole H., Murray Ciarán, Petersen Ditte L. J. (): Nitrogen Inputs from Agriculture: Towards Better Assessments of Eutrophication Status in Marine Waters. AMBIO, , - https://doi.org/10.1007/s13280-014-0514-yAWMA (2009): Areas of Drainage of Agricultural Land in the Czech Republic. Brno, Agricultural Water Management Administration.Balík J., Černý J., Kulhánek M. (2012): Nitrogen Balance in Agriculture. Prague, CULS. (in Czech)Bowes M.J., Gozzard E., Johnson A.C., Scarlett P.M., Roberts C., Read D.S., Armstrong L.K., Harman S.A., Wickham H.D. (2012): Spatial and temporal changes in chlorophyll-a concentrations in the River Thames basin, UK: Are phosphorus concentrations beginning to limit phytoplankton biomass? Science of the Total Environment, 426: 45–55.CHAPRA S. C., ROBERTSON A. (1977): Great Lakes Eutrophication: The Effect of Point Source Control of Total Phosphorus. Science, 196, 1448-1450 https://doi.org/10.1126/science.196.4297.1448Ekholm P., Lehtoranta J. (2012): Does control of soil erosion inhibit aquatic eutrophication? Journal of Environmental Management, 93: 140–146.Fiala D., Rosendorf P. (2010): Non-point sources of phosphorus pollution in the Orlík reservoir watershed and their impact on eutrophication. Vodní hospodářství, 60: 199–202. (in Czech, with English summary)Fiala D., Fučík P., Hruška J., Rosendorf P., Simon O. (2013): Focused on the phosphorus and eutrophication. Vodní hospodářství, 63: 247–250. (in Czech, with English summary)Fraters B., Kovar K., Grant R., Thorling L., Reijs J.W. (eds) (2011): Developments in monitoring the effectiveness of the EU Nitrates Directive Action Programmes. Results of the 2nd MonNO3 Workshop, June 10−11, 2009 [RIVM Report 680717019/2011.] National Institute for Public Health and the Environment (RIVM) .Fučík P., Kaplická M., Zajíček A., Kvítek T. (2010): Evaluation of detailed water quality monitoring system in a small agricultural catchment: discrete vs. continuous approach. Vodní hospodářství, 8: 213–217. (in Czech, with English summary)Horský L. et al. (1970): Hydrological Conditions of the Czechoslovak Socialist Republic. Part III. Prague, HMI. (in Czech)Howarth Robert W., Marino Roxanne (2006): Nitrogen as the limiting nutrient for eutrophication in coastal marine ecosystems: Evolving views over three decades. Limnology and Oceanography, 51, 364-376 https://doi.org/10.4319/lo.2006.51.1_part_2.0364Hrabánková A., Rosendorf P., Klír J. Kozlovská L., Prchalo-vá H. (2012): Report of the Czech Republic on the Status and Trends of Aquatic Environment and Agricultural Practice According to Article 10 and Annex V of Council Directive 91/676/EEC Concerning the Protection of Waters against Pollution Caused by Nitrates from Agricultural Sources. Prague, MoE, MoA, TGM WRI, CRI. (in Czech)Klement V., Sušil A. (2012): Results of Agrochemical Testing of Agricultural Soils for the Period 2006–2011. Brno, CISTA.Klír J., Kunzová E., Čermák P. (2007): The Frame Methodics of Plant Nutrition and Fertilization. Methodology for Practice. Prague, CRI. (in Czech)Krása J., Rosendorf P., Hejzlar J., Borovec J., Dostál T., David V., Janotová B., Bauer M., Devátý J., Strouhal L., Vrána K., Ansorge L., Fiala D., Duras J. (2013): Assessment of Vulnerability of Water Reservoirs to Sediment Loads and Eutrophication Caused by Soil Erosion. Prague, CTU. (in Czech)Kyllmar K., Carlsson C., Gustafson A., Ulén B., Johnsson H. (2006): Nutrient discharge from small agricultural catchments in Sweden. Agriculture, Ecosystems & Environment, 115, 15-26 https://doi.org/10.1016/j.agee.2005.12.004Mason C.F. (1991): Biology of Freshwater Pollution. 2nd Ed. Harlow, New York, Longman Scientific & Technical, John Wiley & Sons, Inc.Němeček J. et al. (1996): Digital Map of Soil Types at a Scale 1 : 200 000. Prague, CULS. (in Czech)Nitrates Directive (1991): Council Directive 91/676/EEC of 12 December 1991 concerning the protection of waters against pollution caused by nitrates from agricultural sources. Official Journal of the European Union, L375: 1–8.Novotny V. (ed.) (1995): Nonpoint Pollution and Urban Stormwater Management – Water. Vol. 9, Basel, Technomic Publishing AG.Pressová J. (2014): Object Catalog of the ZABAGED®. Prague, State Administration of Land Surveying and Cadastre. (in Czech)Procházka J., Brom J., Pechar L. (2009): The comparison of water and matter flows in three small catchments in the Šumava Mountains. Soil and Water Research, 4 (Special Issue 2): 75–82.REYNOLDS C. S., DAVIES P. S. (): Sources and bioavailability of phosphorus fractions in freshwaters: a British perspective. Biological Reviews of the Cambridge Philosophical Society, 76, 27-64 https://doi.org/10.1017/S1464793100005625Rosendorf P., Tušil P., Durčák M., Svobodová J., Beránková T., Vyskoč P. (2011): The Methodology for Evaluating of the General Physico-chemical Quality Elements of Ecological Status in River Water Bodies. Prague, TGM WRI. (in Czech)Tamminen T, Andersen T (2007): Seasonal phytoplankton nutrient limitation patterns as revealed by bioassays over Baltic Sea gradients of salinity and eutrophication. Marine Ecology Progress Series, 340, 121-138 https://doi.org/10.3354/meps340121Topcu Dilek, Behrendt Horst, Brockmann U., Claussen U. (2011): Natural background concentrations of nutrients in the German Bight area (North Sea). Environmental Monitoring and Assessment, 174, 361-388 https://doi.org/10.1007/s10661-010-1463-yUrban Wastewater Treatment Directive (1991): Council Directive 91/271/EEC of 21 May 1991 concerning urban waste-water treatment. Official Journal of the European Union, L135: 40–52.Vagstad N., Stålnacke P., Andersen H.E., Deelstra J., Gustafson A., Ital A., Jansons V., Kyllmar K., Loigu E., Rekolainen S., Tumas R., Vuorenmaa J. (2001): Nutrient Losses from Agriculture in the Nordic and Baltic Countries. Measurements in Small Agricultural Catchments and National Agro-Environmental Statistics. Copenhagen, TemaNord, Nordic Council of Ministers.Water Framework Directive (2000): Directive 2000/60 EC of the European Parliament and of the Council of 23 October 2000 establishing a framework for Community action in the field of water policy. Official Journal of the European Union, L327: 73.Withers Paul J.A, Lord Eunice I (2002): Agricultural nutrient inputs to rivers and groundwaters in the UK: policy, environmental management and research needs. Science of The Total Environment, 282-283, 9-24 https://doi.org/10.1016/S0048-9697(01)00935-4Withers P.J.A., Neal C., Jarvie H.P., Doody D.G. (2014): Agriculture and eutrophication: where do we go from here? Sustainability, 6: 5853–5875.