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Spruce Forests and Peat Wetlands in Lake Bolmen’s Catchment Both Leak and Degrade Coloured Dissolved Organic Carbon
Högskolan i Halmstad, Akademin för företagande, innovation och hållbarhet.
2021 (Engelska)Självständigt arbete på avancerad nivå (magisterexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
Abstract [en]

Lake browning in the northern hemisphere is endangering crucial ecosystem services. Darker water decreases fish and primary production as well as touristic and recreational values. It furthermore requires intensive treatment to receive safe drinking water. Brownification is connected to iron and coloured dissolved organic carbon (DOC). In Sweden, spruce plantations leak DOC, possibly depending in their DOC rate on tree age. Whereas wetlands are known to purify water and might contribute to the degradation of DOC. This thesis aims to investigate how different land use types and other parameters affect water colour. Ditches flowing through old spruce forests, young spruce forests, and peat wetlands in the Lake Bolmen catchment, southwestern Sweden, were sampled at in- and outlet. Highly significantly positive relationships between DOC, iron and absorbance were found. The relationship was strongest between DOC and absorbance (R² = 0.88; p < 0.001) and weakest between DOC and iron (R² = 0.54; p < 0.001). High variability led to no significant differences in the release of DOC and iron between the three land use types. However, older forests tended to increase DOC and iron loading compared to younger forests. This study suggests that not only spruce forests in general are affecting the brownification, but that several different factors like age and underlying soil type might play a critical role. 

Ort, förlag, år, upplaga, sidor
2021.
Nyckelord [en]
Brownification, land use, DOC, iron, water colour
Nationell ämneskategori
Miljövetenskap
Identifikatorer
URN: urn:nbn:se:hh:diva-45323OAI: oai:DiVA.org:hh-45323DiVA, id: diva2:1580519
Externt samarbete
Sydvatten; Lund University
Utbildningsprogram
Magisterprogram i tillämpad miljövetenskap
Handledare
Examinatorer
Tillgänglig från: 2021-08-18 Skapad: 2021-07-14 Senast uppdaterad: 2021-08-18Bibliografiskt granskad

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fulltext(2804 kB)180 nedladdningar
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Akademin för företagande, innovation och hållbarhet
Miljövetenskap

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