NDLI: Nutrient variations in the Sava River Basin

Content Provider	Springer Nature Link
Author	Vrzel, Janja Ogrinc, Nives
Copyright Year	2015
Abstract	The first comprehensive evaluation and trend analysis of long-term nitrogen (N) and phosphorus (P) data was performed for the Sava River Basin (SRB) at locations in Slovenia, Croatia, and Serbia.Data on long-term water quality at eight selected locations were evaluated statistically based on the period of reporting, availability of flow data, and the experience from our previous investigations. Trends in NO$_{3}$ $^{−}$ and PO$_{4}$ $^{3−}$ concentrations at locations were identified using simple linear regressions on log-transformed data.Analysis indicated spatial and seasonal variability between locations. The highest long-term annual mean NO$_{3}$ $^{−}$ and PO$_{4}$ $^{3−}$ concentrations were observed in Croatia and Serbia at locations that are susceptible to anthropogenic nutrient loading arising from high human population densities and intensive agricultural land use. Temporal variations indicate that river flow plays an important role in the distribution of NO$_{3}$ $^{−}$ and PO$_{4}$ $^{3−}$ concentrations. Low flow during the summer months promotes reductive conditions leading to a minimum in annual mean NO$_{3}$ $^{−}$ concentrations and a maximum in annual mean PO$_{4}$ $^{3−}$ concentrations resulting from the release of inorganic P from sediments. The highest annual mean NO$_{3}$ $^{−}$ concentrations were observed in winter/autumn under higher flow conditions that leach NO$_{3}$ $^{−}$ from soil and banks into the river. The results of trend analysis show a reduction of nutrients at the majority of locations ranging from 8 to 58 %.Although trends in NO$_{3}$ $^{−}$ and PO$_{4}$ $^{3−}$ concentrations indicate a decrease at the majority of selected locations, it is still necessary to apply appropriate removal technologies in order to reduce the nutrient loads into the Sava River Basin and thereby improve water quality.
Starting Page	2380
Ending Page	2386
Page Count	7
File Format	PDF
ISSN	14390108
Journal	Journal of Soils and Sediments
Volume Number	15
Issue Number	12
e-ISSN	16147480
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-07-03
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Computational methods Nutrients Sava River Basin Statistics Soil Science & Conservation Environment Environmental Physics
Content Type	Text
Resource Type	Article
Subject	Stratigraphy Earth-Surface Processes

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