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Type of publication: research article
Type of publication (PDB): Straipsnis Clarivate Analytics Web of Science / Article in Clarivate Analytics Web of Science (S1)
Field of Science: Aplinkos inžinerija / Environmental engineering (T004)
Author(s): Šileika, Antanas Sigitas;Stålnacke, Per;Kutra, Saulius;Gaigalis, Kazimieras;Berankienė, Laima
Title: Temporal and Spatial Variation of Nutrient Levels in the Nemunas River (Lithuania and Belarus)
Is part of: Environmental monitoring and assessment. , Vol. 122, Iss. 1-3 (2006)
Extent: p. 335–354
Date: 2006
Keywords: Concentration;Load;Monitoring;Nitrogen;Phosphorus;River;Trend
Abstract: There are discordant results on trends in nutrient river water quality from the economical transition countries in Europe. The present study assessed the impact of these economical changes on the load and concentration at 17 monitoring stations along the Nemunas River and its major tributaries (Lithuania and Belarus). Three time periods were evaluated: the Soviet rule command system period 1986–1991, the transfer to market economy period 1992–1996 and the post reform period 1997–2002. The most surprising result in this study, was the increased area-specific load of NO3-N from the first to the third period at almost all the sampling sites. The increase was particularly large (43–78%) at the sites in the Lithuanian part of the river. The corresponding load increase in the Belarussian part of the river was only 1–15%. The statistical analyses of concentration data confirm the strong upward NO3-N trend at the Nemunas mouth and at 5 of the 6 tributaries in the lower part of Nemunas. Temporal and spatial analysis of nitrates transport in the Nemunas River and its main tributaries revealed that nitrates mainly originate from agricultural areas. The upward trends were most likely an effect of ploughing of pastures and unbalanced crop fertilisation in combination with large storage and accumulation of soil-nitrogen during the Soviet period. On contrary to nitrate-N, the area-specific load of PO4-P decreased significantly from the first to the third period at all sites along the Nemunas River (31–86%). Seasonal (SMK) and Partial (PMK) Mann-Kendall tests on PO4-P concentrations also showed significant downward trend at 14 of 16 investigated sites. The decrease of PO4-P levels was attributed to the reduction of municipal and industrial point source emissions and to the decreased livestock numbers. The NH4-N load showed the same pattern as PO4-P
Affiliation(s): Vytauto Didžiojo universitetas
Žemės ūkio akademija
Appears in Collections:Universiteto mokslo publikacijos / University Research Publications

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