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Watershed modelling of nonpoint nitrogen losses from arable land to the Swedish coast in 1985 and 1994
SMHI, Research Department, Hydrology.ORCID iD: 0000-0001-8314-0735
SMHI, Research Department, Hydrology.
2000 (English)In: Ecological Engineering: The Journal of Ecotechnology, ISSN 0925-8574, E-ISSN 1872-6992, Vol. 14, no 4, 389-404 p.Article in journal (Refereed) Published
Abstract [en]

Eutrophication problems in the Baltic Sea have drawn attention to the contribution of nutrients from surrounding countries. By using the HBV-N model in southern Sweden (145 000 km(2)) daily nitrogen leaching, reduction in rivers and lakes, net transport to the sea and source apportionment have been calculated in 3725 subbasins for the period 1985-1994, with calibration at 722 sites against measured time series. On average, 48% of the nonpoint losses from agriculture were reduced during the transport towards the sea, which left about 33 500 tonnes in annual mean net transport. This represents 45% of the total land-based load. Land cover and emissions for the years of 1985 and 1994 were used in two separate simulations of the 10-year period. The normalized gross leakage from arable land in 1985 was estimated to 29 kg N ha(-1) year(-1), which corresponds to 15 kg N ha(-1) year(-1) in net leakage to the sea. In 1994 these transports were reduced by 20 and 15%, and thereby the total load on the sea was decreased by 7%. This is still far from the Swedish goal of 50% reduction. The article presents the spatial variation of nitrogen leakage and retention within the southern half of Sweden, and emphasizes the importance of allocating measures where down-stream retention is low in order to achieve efficiency with respect to the sea. It is shown that the model approach may be used in the decision making process for best management practices in watersheds. (C) 2000 Elsevier Science B.V. All rights reserved.

Place, publisher, year, edition, pages
2000. Vol. 14, no 4, 389-404 p.
Keyword [en]
watershed modelling, nonpoint source, nitrogen, arable land, retention, spatial variation, measure allocation, Sweden
National Category
Oceanography, Hydrology, Water Resources
Research subject
Hydrology
Identifiers
URN: urn:nbn:se:smhi:diva-1503DOI: 10.1016/S0925-8574(99)00063-4ISI: 000086734300006OAI: oai:DiVA.org:smhi-1503DiVA: diva2:847694
Conference
Joint Conference of the 7th Stockholm Water Symposium / 3rd International Conference on the Environmental Management of Enclosed Coastal Seas (EMECS), AUG 10-15, 1997, STOCKHOLM, SWEDEN
Available from: 2015-08-21 Created: 2015-08-17 Last updated: 2016-03-29Bibliographically approved

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Citation style
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