caa a22 4500 467905045 CHVBK 20180406152831.0 cr unu---uuuuu 170328e20060901xx s 000 0 eng 10.1007/s10661-005-9071-y doi (NATIONALLICENCE)springer-10.1007/s10661-005-9071-y Changes in Nutrient Emissions, Fluxes and Retention in a North-Eastern European Lowland Drainage Basin [Elektronische Daten] [Daniel Mourad, Marcel Van Der Perk, Kristjan Piirimäe] Despite dramatic reductions in the 1990s of N and P emissions in the drainage basin, Lake Peipsi/Chudskoe (Estonia/Russia) is still suffering from algal blooms, probably caused by low N:P ratios of the lake water. To quantify the sources and changes of N and P inputs to the lake as a result of economic changes, we modelled emissions, transfer and in-stream retention using a GIS model. The model was calibrated using river monitoring data from the 1985-1989 period, and used to simulate emissions and loads for five future scenarios for 2015-2019. During the 1985-1999 period, diffuse P emissions decreased relatively more than N diffuse emissions, but this was not reflected in the loads to the lake. P loads decreased relatively less than N loads, which caused a decrease in the N:P ratio of the rivers. About 30-45% of diffuse N emissions and only 3-10% of diffuse P emissions reaches the river network. In-stream retention reduces N and P loads to the lake by about 62% and 72%, respectively. Point sources contribute negligibly to the N load to the lake, but form about one-third of the P load. A target/fast development scenario is the most likely scenario for the 2015-2019 period, resulting in higher nutrient loads than in recent years. We conclude that effective load reductions can be achieved by focussing on diffuse N and P emissions close ( < 50 km2) to the lake and by upgrading P removal capacity in wastewater treatment plants of towns. Springer Science+Business Media, Inc., 2006 eutrophication nationallicence Lake Peipsi/Chudskoe nationallicence nitrogen nationallicence phosphorus nationallicence scenarios nationallicence geographical information systems nationallicence Estonia nationallicence Russia nationallicence Mourad Daniel Department of Physical Geography, Faculty of Geosciences, Utrecht University, PO Box 80115, 3508 TC, Utrecht, The Netherlands aut Van Der Perk Marcel Department of Physical Geography, Faculty of Geosciences, Utrecht University, PO Box 80115, 3508 TC, Utrecht, The Netherlands aut Piirimäe Kristjan Department of Environmental Engineering, Faculty of Civil Engineering, Tallinn University of Technology, Ehitajate Tee 5, 19086, Tallinn, Estonia aut Environmental Monitoring and Assessment Kluwer Academic Publishers 120/1-3(2006-09-01), 415-448 0167-6369 120:1-3<415 2006 120 10661 https://doi.org/10.1007/s10661-005-9071-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10661-005-9071-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mourad Daniel Department of Physical Geography, Faculty of Geosciences, Utrecht University, PO Box 80115, 3508 TC, Utrecht, The Netherlands aut NATIONALLICENCE 700 1- Van Der Perk Marcel Department of Physical Geography, Faculty of Geosciences, Utrecht University, PO Box 80115, 3508 TC, Utrecht, The Netherlands aut NATIONALLICENCE 700 1- Piirimäe Kristjan Department of Environmental Engineering, Faculty of Civil Engineering, Tallinn University of Technology, Ehitajate Tee 5, 19086, Tallinn, Estonia aut NATIONALLICENCE 773 0- Environmental Monitoring and Assessment Kluwer Academic Publishers 120/1-3(2006-09-01), 415-448 0167-6369 120:1-3<415 2006 120 10661 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer