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Acidity controls on dissolved organic carbon mobility in organic soils
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SYSNO ASEP 0381513 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Acidity controls on dissolved organic carbon mobility in organic soils Author(s) Evans, Ch. D. (GB)
Jones, T. (GB)
Burden, A. (GB)
Ostle, N. (GB)
Zielinski, P. (PL)
Cooper, M. (GB)
Peacock, M. (GB)
Clark, J. (GB)
Oulehle, Filip (UEK-B) RID, ORCID, SAI
Cooper, D. (GB)
Freeman, Ch. (GB)Number of authors 11 Source Title Global Change Biology. - : Wiley - ISSN 1354-1013
Roč. 18, č. 11 (2012), s. 3317-3331Number of pages 15 s. Language eng - English Country GB - United Kingdom Keywords acidity ; dissolved organic carbon ; organic soil ; peat ; podzol ; soil carbon ; sulphur Subject RIV EH - Ecology, Behaviour Institutional support RVO:67179843 - RVO:67179843 UT WOS 000309450300007 DOI 10.1111/j.1365-2486.2012.02794.x Annotation Dissolved organic carbon (DOC) concentrations in surface waters have increased across much of Europe and North America, with implications for the terrestrial carbon balance, aquatic ecosystem functioning, water treatment costs and human health. Over the past decade, many hypotheses have been put forward to explain this phenomenon, from changing climate and land management to eutrophication and acid deposition. Resolution of this debate has been hindered by a reliance on correlative analyses of time series data, and a lack of robust experimental testing of proposed mechanisms. In a 4 year, four-site replicated field experiment involving both acidifying and deacidifying treatments, we tested the hypothesis that DOC leaching was previously suppressed by high levels of soil acidity in peat and organo-mineral soils, and therefore that observed DOC increases a consequence of decreasing soil acidity. We observed a consistent, positive relationship between DOC and acidity change at all sites. Responses were described by similar hyperbolic relationships between standardized changes in DOC and hydrogen ion concentrations at all sites, suggesting potentially general applicability. These relationships explained a substantial proportion of observed changes in peak DOC concentrations in nearby monitoring streams, and application to a UK-wide upland soil pH dataset suggests that recovery from acidification alone could have led to soil solution DOC increases in the range 46–126% by habitat type since 1978. Our findings raise the possibility that changing soil acidity may have wider impacts on ecosystem carbon balances. Decreasing sulphur deposition may be accelerating terrestrial carbon loss, and returning surface waters to a natural, high-DOC condition. Workplace Global Change Research Institute Contact Nikola Šviková, svikova.n@czechglobe.cz, Tel.: 511 192 268 Year of Publishing 2013
Number of the records: 1