Näringsläckage till Hanöbukten via vattendrag i västra Blekinge: En provtagningsstudie av 9 vattendrag i Sölvesborg, Karlshamn och Olofström
Hanö Bay is a shallow and sensitive recipient of watercourses in Blekinge where land use isdominated by forest, agriculture and mink breeding. The aims of this report are: to study theeffects of the land use, soil and human activities on the watercourses; how water chemistrychanges on its way from municipal line/county line/source lake; and how Hanö Bay, as recipient,is affected by the activities in each watercourse´s drainage area. This report is based ona sample series of six occasions from January 27 to April 7 in the municipalities Karlshamn,Olofström and Sölvesborg, with a focus on pH, alkalinity, total nitrogen and total phosphorousin nine different watercourses. In the watercourses with more than 50 % agriculture in itsdrainage area water chemistry is affected by the land use and human activities. The highestcontent of total nitrogen was measured in Siretorpskanalen with 20 mg/l. The highest contentof total phosphorous was measured in Hörviksbäcken with 0,5 mg/l. Årydsån, Mieån,Mörrumsån and Gallån are not regulated and follow a common trend during the sampleperiod. Vesankanalen, Siretorpskanalen and Hörviksbäcken are regulated and do not followthe same trend as the unregulated watercourses. This is a clear signal that those water coursesdo not have a “natural behavior”. The importance of the soil was not estimated. Several of thewatercourses have an addition of nutrients from municipal line/county line/source lake.Measures to improve the status of several of the watercourses are needed as soon as possible.
total nitrogen, total phosphorous, human activity, Hanö bay
IdentifiersURN: urn:nbn:se:umu:diva-31302OAI: oai:DiVA.org:umu-31302DiVA: diva2:292329
Brånin, Bertil, PhDJezek, Andreas