Change search
ReferencesLink to record
Permanent link

Direct link
Decreasing DOC trends in soil solution along the hillslopes at two IM sites in southern Sweden: Geochemical modeling of organic matter solubility during acidification recovery
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering, Environmental Geochemistry and Ecotechnology.ORCID iD: 0000-0001-8771-7941
2010 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 409, no 1, 201-210 p.Article in journal (Refereed) Published
Abstract [en]

Numerous studies report increased concentrations of dissolved organic carbon (DOC) during the last two decades in boreal lakes and streams in Europe and North America Recently a hypothesis was presented on how various spatial and temporal factors affect the DOC dynamics It was concluded that declining sulphur deposition and thereby increased DOC solubility is the most important driver for the long-term DOC concentration trends in surface waters If this recovery hypothesis is correct the DOC levels should increase both in the soil solution as well as in the surrounding surface waters as soil pH rises and the ionic strength declines due to the reduced input of SO42- ions In this project a geochemical model was set up to calculate the net humic charge and DOC solubility trends in soils during the period 1996-2007 at two integrated monitoring sites in southern Sweden showing clear signs of acidification recovery The Stockholm Humic Model was used to investigate whether the observed DOC solubility is related to the humic charge and to examine how pH and ionic strength influence it Soil water data from recharge and discharge areas covering both podzols and riparian soils were used The model exercise showed that the increased net charge following the pH increase was in many cases counteracted by a decreased ionic strength, which acted to decrease the net charge and hence the DOC solubility Thus the recovery from acidification does not necessarily have to generate increasing DOC trends in soil solution Depending on changes in pH ionic strength and soil Al pools the trends might be positive negative or indifferent Due to the high hydraulic connectivity with the streams the explanations to the DOC trends in surface waters should be searched for in discharge areas and peat lands.

Place, publisher, year, edition, pages
2010. Vol. 409, no 1, 201-210 p.
Keyword [en]
DOC trends, Forest soils, Soil water, Recovery from acidification, Stockholm Humic Model, Integrated monitoring
National Category
Other Environmental Engineering
URN: urn:nbn:se:kth:diva-28177DOI: 10.1016/j.scitotenv.2010.09.023ISI: 000285070900023ScopusID: 2-s2.0-78149357173OAI: diva2:385302
QC 20110111Available from: 2011-01-11 Created: 2011-01-10 Last updated: 2011-01-11Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Gustafsson, Jon Petter
By organisation
Environmental Geochemistry and Ecotechnology
In the same journal
Science of the Total Environment
Other Environmental Engineering

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 15 hits
ReferencesLink to record
Permanent link

Direct link