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Type of publication: Straipsnis kitose duomenų bazėse / Article in other databases (S4)
Field of Science: Aplinkos inžinerija / Environmental engineering (T004)
Author(s): Lamsodis, Romanas;Vaikasas, Saulius
Title: The potential to retain nitrogen in beaver ponds and delta floodplains of the River Nemunas
Is part of: Archiv für Hydrobiologie. Supplementband. Large Rivers. Stuttgart: Schweizerbart., Vol. 15, No. 1-4 (2005)
Extent: p. 225-241
Date: 2005
Abstract: The River Nemunas (97,860 km2) flows via the Curonian Lagoon into the Baltic Sea. and has 400 km2 of floodplains in the delta. 82 % of the hydrographical network in the LMmanian sector (consisting of 47 %) of the basin is regulated and converted into drainage :3annels. Due to its catchment size and significant pollution from agriculture, the Nemunas River basin is identified as an agricultural hot spot in the Baltic Sea basin. On average, the wal annual inorganic nitrogen runoff of the river is 26.9 x 106 kg; it corresponds to the load : of 275 kg km 2 yr About 11,000-12,000 beavers (Castor fiber L.) inhabit these drainage chanels. It is estimated that beaver impounding activities in drainage channels in Lithuania Tdght reduce the nitrogen load from the River Nemunas between 42-121 kg km2 yr. Reriuction is most intensive in spring and summer. Man-controlled inundation (summer type pa Iders) of floodplains in the Nemunas delta may further reduce its runoff nitrogen load by 21 kg km2 per flood event. Low flow velocities and long retention times allowing for sedimentation and denitrifying processes favour this self-purification. Beaver impoundments in drainaige channels as well as inundation of the Nemunas delta floodplains are potentially natural means to assist the rehabilitation of trained river reaches and valleys
Affiliation(s): Vytauto Didžiojo universitetas
Žemės ūkio akademija
Appears in Collections:Universiteto mokslo publikacijos / University Research Publications

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