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

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Löfgren, StefanSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för vatten och miljö,Department of Aquatic Sciences and Assessment (author)

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

Article/chapterEnglish2010

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Elsevier BV,2010
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LIBRIS-ID:oai:DiVA.org:kth-28177
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-28177URI
https://doi.org/10.1016/j.scitotenv.2010.09.023DOI
https://res.slu.se/id/publ/30739URI

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Language:English
Summary in:English

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Subject category:ref swepub-contenttype
Subject category:art swepub-publicationtype

Notes

QC 20110111
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.

Subject headings and genre

TEKNIK OCH TEKNOLOGIER Naturresursteknik Annan naturresursteknik hsv//swe
ENGINEERING AND TECHNOLOGY Environmental Engineering Other Environmental Engineering hsv//eng
LANTBRUKSVETENSKAPER Annan lantbruksvetenskap Miljö- och naturvårdsvetenskap hsv//swe
AGRICULTURAL SCIENCES Other Agricultural Sciences Environmental Sciences related to Agriculture and Land-use hsv//eng
LANTBRUKSVETENSKAPER Lantbruksvetenskap, skogsbruk och fiske Skogsvetenskap hsv//swe
AGRICULTURAL SCIENCES Agriculture, Forestry and Fisheries Forest Science hsv//eng
LANTBRUKSVETENSKAPER Lantbruksvetenskap, skogsbruk och fiske Fisk- och akvakulturforskning hsv//swe
AGRICULTURAL SCIENCES Agriculture, Forestry and Fisheries Fish and Aquacultural Science hsv//eng
DOC trends
Forest soils
Soil water
Recovery from acidification
Stockholm Humic Model
Integrated monitoring
Environmental engineering
Miljöteknik

Added entries (persons, corporate bodies, meetings, titles ...)

Gustafsson, Jon PetterSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,KTH,Miljögeokemi och ekoteknik,Institutionen för mark och miljö,Department of Soil and Environment(Swepub:slu)49826 (author)
Bringmark, LageSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för vatten och miljö,Department of Aquatic Sciences and Assessment(Swepub:slu)51174 (author)
Sveriges lantbruksuniversitetInstitutionen för vatten och miljö (creator_code:org_t)
Sveriges lantbruksuniversitet

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In:Science of the Total Environment: Elsevier BV409:1, s. 201-2100048-96971879-1026

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ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Environmental En ...; and Other Environmen ...

AGRICULTURAL SCIENCES: AGRICULTURAL SCI ...; and Other Agricultur ...; and Environmental Sc ...

AGRICULTURAL SCIENCES: AGRICULTURAL SCI ...; and Agriculture Fore ...; and Forest Science

AGRICULTURAL SCIENCES: AGRICULTURAL SCI ...; and Agriculture Fore ...; and Fish and Aquacul ...

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