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Role of catchment area in the transport of nutrients to lakes in the Wielkopolska National Park in Poland
Author(s) -
Szyper Halina,
Gołdyn Ryszard
Publication year - 2002
Publication title -
lakes and reservoirs: research and management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.296
H-Index - 39
eISSN - 1440-1770
pISSN - 1320-5331
DOI - 10.1046/j.1440-1770.2002.00164.x
Subject(s) - nutrient , environmental science , drainage basin , catchment area , eutrophication , phosphorus , hydrology (agriculture) , national park , water quality , pollution , recreation , sewage , nutrient pollution , point source pollution , nitrogen , trophic level , nonpoint source pollution , ecology , environmental engineering , geography , geology , biology , materials science , cartography , geotechnical engineering , physics , quantum mechanics , metallurgy
The external loading of 14 lakes in the Wielkopolska National Park was calculated, including nitrogen and phosphorus loads from point, diffuse and dispersed sources, precipitation and recreation. The basic source of nitrogen and phosphorus for most lakes in the Park is the export of diffuse pollution from the catchment area. Only four lakes are contaminated by sewage, which accounts for 0.1–61.2% of total nutrient loading. Annual unit area loads of phosphorus and nitrogen estimated for each lake were 2–51 times higher than Vollenweider’s critical loading levels. Estimated mass loading and annual unit area loads of nutrients for each lake were compared with lake water quality, expressed as the trophic state index. Analysis of the physico‐geographical structure of the catchment area and natural resistance of lakes to external input of nutrients allowed us to assess the role of the catchment in the deterioration of water quality and to indicate the protective measures required.