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Hvor er de markene i Sverige som er mest sensitive ovenfor forsuring og nitrogentap?
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
2012 (Norwegian)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Where are the soils in sweden that are most sensitive to acidification and nitrogen loss? (English)
Abstract [en]

Several factors affect whether the ground is prone to acidification and nitrogen loss. Removal of biological materials is an important factor that can trigger this. In Sweden, three dominant forest tree species are spruce, pine and birch trees. For forestry purposes, these trees are being logged at their potimal harvesting ages which are averaged at 70 years of age. This is of interest beacuse the forest ages can be used to predict future forestry practices, specifically in Dalarna, Sweden. The forest ages were observed at a catchment based level so that the effects of forestry can easily be measured. It was found that cathcments in the north of Dalarna consist of higher percentages of forest over the age of 70 in comparsion to the south and areas surrounding lakes. From this, it is expected that forestry will occur in the near future in the north.

Hopefully the work that has been done in Dalarna, can be used as a model for the rest of Sweden.

Abstract [no]

Flere faktorer virker inn på om marken er utsatt for forsuring og nitrogenlekkasje. Fjerning av biologisk materiale er en viktig faktor som kan trigge nettopp dette. Finner man de områdene som har mest skogshugst, kan man få et svar på problemet. I Sverige er de tre dominerende treartene gran, furu og bjørk. For at skogsbruket skal få en størst mulig økonomisk gevinst, blir trærne kuttet når de er 70 år. Dette er av interesse fordi skogsalderen kan bli brukt til å prediktere fremtidig skogsbruk, spesielt i Dalarna, Sverige. Skogens alder ble observert i nedbørsfelt som var mindre enn 3 km2 , fordi markens respons på skogsbruk lettere kan måles i mindre områder.

Det ble funnet at nedbørsfelt nord i Dalarna har høyest prosentandel av skog over 70 år, sammenlignet med de sørlige områdene og områder rundt innsjøer. Disse resultatene viser at vi kan forvente at områdene nord i Dalarna, er mest sensitive ovenfor forsuring og nitrogenlekkasjede neste ti til tyve årene.

Det arbeidet som er for å finne sensitive områder i Dalarna, kan bli brukt som en modell for resten av Sverige.   

Place, publisher, year, edition, pages
2012.
Series
Självständigt arbete i geovetenskap ; 28
National Category
Oceanography, Hydrology and Water Resources
Identifiers
URN: urn:nbn:se:uu:diva-177377OAI: oai:DiVA.org:uu-177377DiVA, id: diva2:540815
Educational program
Bachelor Programme in Earth Science
Presentation
2012-05-30, Hambergsalen, Geocentrum, Uppsala universitet, Villavägen 16, Uppsala, 13:40 (Norwegian)
Uppsok
Life Earth Science
Supervisors
Examiners
Available from: 2012-07-17 Created: 2012-07-11 Last updated: 2018-06-27Bibliographically approved

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