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A study of factors controlling pH in Arctic tundra soils
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och geovetenskap.
2019 (Engelska)Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
Abstract [en]

In Arctic tundra soils pH serves as an important parameter related to several biotic parameters such as, plant and microbial community composition, biodiversity, nutrient dynamics and productivity. Both abiotic and biotic factors, for instance, base saturation (BS) and plant nutrient uptake may exert a control on soil pH, while it is still unclear to what extent different factors can explain soil pH across different tundra vegetation types. The aim of this study was to investigate to what extent different abiotic and biotic factors influence soil pH in the humus layer across different tundra vegetation types. To do so, eight different tundra vegetation types of which four were underlaid by permafrost (Arctic Alaska) and four with no permafrost (Arctic Sweden) were studied in detail with regard to different properties affecting soil pH. I found that BS was the main factor controlling soil pH across the different vegetation types regardless if the soil was underlain by permafrost or not. Factors, such as, ionic strength or soil water content could not explain any overall pH variation and did only significantly affect the heath soils. Further, the uptake of the most abundant base cations (Ca2+, Mg2+ and K+) from meadow and heath vegetation revealed a high difference between plant functional groups within the same vegetation types. The higher dominance of slow growing woody species in heath vegetation which had a lower uptake corresponded with a lower BC content (especially (Ca2+), pH and BS in the humus soil relative the meadow meanwhile the content of K+ was more than three times higher in heath. Overall, this study suggests that the degree of neutralization (base saturation) regulates pH either via the influence of bedrock and hydrogeochemistry and/or via plant traits that affects the uptake and turnover of base cations. 

Ort, förlag, år, upplaga, sidor
2019. , s. 29
Nyckelord [en]
pH, Arctic tundra soils, base saturation, base cations, cation exchange capacity
Nationell ämneskategori
Naturvetenskap
Identifikatorer
URN: urn:nbn:se:umu:diva-163364OAI: oai:DiVA.org:umu-163364DiVA, id: diva2:1351807
Ämne / kurs
Examensarbete i Geovetenskap/naturgeografi avseende masterexamen
Utbildningsprogram
Masterprogrammet i geoekologi
Presentation
2019-08-30, Umeå, 10:00 (Engelska)
Handledare
Examinatorer
Tillgänglig från: 2019-09-17 Skapad: 2019-09-16 Senast uppdaterad: 2019-09-17Bibliografiskt granskad

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Thomas, Jacob
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Institutionen för ekologi, miljö och geovetenskap
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