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Michelsen, Sofie, 2021. Internbelastningsrisk från våtmarkssediment. First cycle, G2E. Uppsala: SLU, Dept. of Aquatic Sciences and Assessment

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Abstract

Syftet med studien var att kvantifiera internbelastningsrisken i 21 anlagda våtmarker i jordbruksområden runt sjön Mälaren i Sverige. Även att utvärdera hur avrinnings- och våtmarksfaktorer påverkar internbelastningsrisken. I denna studie varierade den uträknade maximala internbelastningen (Li) i våtmarkerna mellan 4 upp till 21,6 mg/m2/d. Variationen påverkades främst av den totala massan P och andelen järnbunden P i våtmarkerna. Modellen inkluderar däremot inte labil organisk bunden P, vilket gör att internbelastningsrisken i våtmarkerna kan vara större. Andel jordbruksmark och lerinnehåll hade lite eller ingen effekt på internbelastningsrisken. Däremot hade våtmarksfaktorer viss påverkan. De anlagda våtmarkerna som var utformade för P- ackumulation hade generellt högre P koncentration, vilket kan bidra till internbelastning, än våtmarker som inte var anlagda i samma syfte. I vidare undersökningar kan ytterligare avrinningsfaktorer vara viktiga att inkludera för bättre förståelse av extern påverkan på internbelastningen i våtmarkerna.

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The aim of this study was to quantify the risk of internal loading of phosphorus (P) in the sediments of 21 constructed wetlands, situated in agricultural catchment in close proximity to the lake Mälaren in Sweden. Furthermore, to evaluate how factors in the catchment area and in the wetlands, effect the risk of internal loading. This study found that the calculated maximal internal loading (Li) in the wetlands ranged from 4 up to 21,6 mg/m2/d. This variation is mostly due to the total mass of P and iron bound P found in the wetlands. However, the model does not include organic bound P, and the amount of P that risk leaking from the wetlands could be higher. Share of agricultural land and clay content did not have a profound effect on the risk of internal loading. Factors in the wetlands however had some impact. The constructed wetlands designed for P accumulation had generally a higher concentration of P, which could contribute to internal loading, than wetlands with similar depth. For further studies, including additional catchment-factors would perhaps be an option for better understanding the external impact on internal loading in the wetlands.

Main title:Internbelastningsrisk från våtmarkssediment
Authors:Michelsen, Sofie
Supervisor:Geranmayeh, Pia
Examiner:Huser, Brian
Series:UNSPECIFIED
Volume/Sequential designation:UNSPECIFIED
Year of Publication:2021
Level and depth descriptor:First cycle, G2E
Student's programme affiliation:NK001 Biology and Environmental Science - Bachelor's Programme 180 HEC
Supervising department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Keywords:Internbelastning, anlagda våtmarker, övergödning, fosforretention, jordbruksmark
URN:NBN:urn:nbn:se:slu:epsilon-s-17125
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-s-17125
Subjects:Nature conservation and land resources
Water resources and management
Soil science and management
Language:Swedish
Deposited On:31 Aug 2021 11:40
Metadata Last Modified:01 Sep 2021 01:00

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