Palmer, SM, Clark, JM, Chapman, PJ et al. (2 more authors) (2013) Effects of acid sulphate on DOC release in mineral soils: The influence of SO retention and Al release. European Journal of Soil Science. ISSN 1351-0754
Abstract
Summary: Dissolved organic carbon (DOC) in acid-sensitive upland waters is dominated by allochthonous inputs from organic-rich soils, yet inter-site variability in soil DOC release to changes in acidity has received scant attention in spite of the reported differences between locations in surface water DOC trends over the last few decades. In a previous paper, we demonstrated that pH-related retention of DOC in O horizon soils was influenced by acid-base status, particularly the exchangeable Al content. In the present paper, we investigate the effect of sulphate additions (0-437μeql) on DOC release in the mineral B horizon soils from the same locations. Dissolved organic carbon release decreased with declining pH in all soils, although the shape of the pH-DOC relationships differed between locations, reflecting the multiple factors controlling DOC mobility. The release of DOC decreased by 32-91% in the treatment with the largest acid input (437μeql), with the greatest decreases occurring in soils with very small % base saturation (BS, <3%) and/or large capacity for sulphate (SO ) retention (up to 35% of added SO ). The greatest DOC release occurred in the soil with the largest initial base status (12% BS). These results support our earlier conclusions that differences in acid-base status between soils alter the sensitivity of DOC release to similar sulphur deposition declines. However, superimposed on this is the capacity of mineral soils to sorb DOC and SO , and more work is needed to determine the fate of sorbed DOC under conditions of increasing pH and decreasing SO.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2013, Wiley Blackwell. This is an author produced version of a paper published in European Journal of Soil Science. Uploaded in accordance with the publisher's self-archiving policy. The definitive version is available at www3.interscience.wiley.com |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Geography (Leeds) The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 26 Jun 2013 11:28 |
Last Modified: | 04 Jul 2013 13:32 |
Published Version: | http://dx.doi.org/10.1111/ejss.12048 |
Status: | Published |
Publisher: | Wiley Blackwell |
Identification Number: | 10.1111/ejss.12048 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:75866 |