Affiliation:
1. Department of Environmental Engineering and Water Management, Faculty of Environment and Civil Engineering , Latvia University of Life Sciences and Technologies , Akademijas iela 19 , Jelgava , Latvia
Abstract
Abstract
The Baltic Sea is the youngest sea on our planet, the environment of the sea is considered to be unique and fragile. It is affected by various human activities resulting in the impairment of water quality. Riverine nutrient (nitrogen and phosphorus) loads are among the major causes of eutrophication of the Baltic Sea. This study examines temporal trends in water discharge, total phosphorus (TP) and orthophosphate-phosphorus (PO4-P) concentrations and losses from three agricultural runoff monitoring sites in Latvia including Berze, Mellupite, and Vienziemite. The annual datasets of TP and PO4-P concentrations and losses were tested for statistical trends using a nonparametric test - the Mann-Kendall trend test. The timeframe of this study was from 1995 until 2018. The results show a large variety of annual mean concentrations and losses of TP and PO4-P in the study period. No statistically significant trend was detected for TP losses. Meanwhile, statistically significant downward trends were observed for TP concentrations in four out of six study sites and in two study sites for PO4-P concentrations.
Subject
General Environmental Science,Renewable Energy, Sustainability and the Environment
Reference15 articles.
1. [1] Directive 2000/60/EC of the European Parliament and of the Council of 23 October 2000 establishing a framework for Community action in the field of water policy. Official Journal of European Union 2000: L 327/1
2. [2] Pawlak J., Laamanen M., Andersen J. H. Eutrophication in the Baltic Sea: An Integrated Thematic Assessment of the Effects of Nutrient Enrichment in the Baltic Sea Region: Executive Summary. HELCOM, 2009, No.115A. https://doi.org/10.13140/RG.2.1.2758.0564
3. [3] Sharpley A. N., Bergström L., Aronsson H., Bechmann M., Bolster C. H., Börling K., Djodjic F., Jarvie H. P., Schoumans O. F., Stamm C., Tonderski K. S., Ulén B., Uusitalo R., Withers P. J. A. Future agriculture with minimized phosphorus losses to waters: Research needs and direction. AMBIO 2015:44(2):163–179. https://doi.org/10.1007/s13280-014-0612-x
4. [4] Pengerud A., Stålnacke P., Bechmann M., Blicher-Mathiesen G., Iital A., Koskiaho J., Kyllmar K., Lagzdins A., Povilaitis A. Temporal trends in phosphorus concentrations and losses from agricultural catchments in the Nordic and Baltic countries. Acta Agriculturae Scandinavica, Section B — Soil & Plant Science 2015:65(2):173–185. https://doi.org/10.1080/09064710.2014.993690
5. [5] Donohue R., Davidson W. A., Peters N. E., Nelson S., Jakowyna B. Trends in total phosphorus and total nitrogen concentrations of tributaries to the Swan–Canning Estuary, 1987 to 1998. Hydrolgical Processes 2001:15(13):2411– 2434. https://doi.org/10.1002/hyp.300
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献