Sjöar och vattendrag inom Bureälvens avrinningsområde: Kartläggning, statusklassificering och analys kring totalfosfor
Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Bure river catchment – mapping, status classification and analysis of total phosphorus
The purpose of this report has been to analyze spatial and temporal patterns of total phosphorus (TP) concentrations in the Bure river catchment (NE Sweden). Furthermore, status classifications of TP in streams and lakes were made according to the Swedish EPA’s assessment criteria. The data-set consisted of collected water measurements from different water authorities. Relatively low TP levels and high status ratings occurred in first order streams and peripheral lakes with partly more forested catchments. In contrast, relatively high TP levels and lower status ratings were found in the more central parts (including second and third order streams) of the catchment, with highest TP levels in small lakes surrounded by agricultural areas. The relationship between the proportion of agricultural area in the river or lake catchments and TP levels showed a weak positive correlation, indicating that agricultural activity may enhance TP concentrations. Long-term TP trends of three lakes showed consistently a slight downward trend, however this was only significant in one lake. For rivers, the trends are ambiguous (no trend was significant), but for the last 10 years TP levels are rather constant. Ambiguous TP trends in the Bure river catchment are consistent with patterns found in central Sweden, and are related to factors such as the degree of agricultural activity, climate conditions affecting weathering rates, and point source outputs. The ambiguous trends may also be partly due to strong bindings of phosphorous to soil particles, resulting in a delay of observing an effect of reduced TP output.
Place, publisher, year, edition, pages
2012. , 52 p.
eutrophication, total phosphorus, status classification, agricultural land, time trends
IdentifiersURN: urn:nbn:se:umu:diva-59021OAI: oai:DiVA.org:umu-59021DiVA: diva2:550637
Subject / course
Examensarbete i miljö och hälsoskydd
Bachelor of Science in Environmental Health
UppsokLife Earth Science
Bigler, Christian, Universitetslektor
Tengel, Viktoria, Universitetslektor