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Acidity controls on dissolved organic carbon mobility in organic soils

Evans, Chris D. ; Jones, Tim G. ; Burden, Annette ; Ostle, Nick ; Zieliński, Piotr ; Cooper, Mark D. A. ; Peacock, Mike ; Clark, Joanna M. ; Oulehle, Filip ; Cooper, David ; Freeman, Chris

Global change biology, 2012-11, Vol.18 (11), p.3317-3331 [Periódico revisado por pares]

Oxford: Blackwell Publishing Ltd

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  • Título:
    Acidity controls on dissolved organic carbon mobility in organic soils
  • Autor: Evans, Chris D. ; Jones, Tim G. ; Burden, Annette ; Ostle, Nick ; Zieliński, Piotr ; Cooper, Mark D. A. ; Peacock, Mike ; Clark, Joanna M. ; Oulehle, Filip ; Cooper, David ; Freeman, Chris
  • Assuntos: Acidity ; Animal and plant ecology ; Animal, plant and microbial ecology ; Biological and medical sciences ; Carbon cycle ; dissolved organic carbon ; Fundamental and applied biological sciences. Psychology ; General aspects ; Organic chemicals ; organic soil ; peat ; podzol ; soil carbon ; Soil sciences ; Sulfur ; sulphur
  • É parte de: Global change biology, 2012-11, Vol.18 (11), p.3317-3331
  • Notas: ArticleID:GCB2794
    ark:/67375/WNG-XCGHC425-1
    Department of Environment, Food and Rural Affairs - No. NE/E011837/1
    Figure S1. Annual mean DOC concentrations at long-term monitoring sites in the UK Acid Waters Monitoring Network located close to the experimental sites. The River Etherow is located within 5 km of the Peak District experimental sites, and has a catchment dominated by blanket peat, with peaty podzols on steeper hillslopes. Llyn Llagi (a lake) is located 13 km west of the Migneint experiments, whereas the Afon Gwy (a river) is located approximately 50 km south. Both Welsh catchments are dominated by organo-mineral soils, with smaller areas of blanket peat. Trend lines shown are linear regression fits to annual mean data. Figure S2. Ratio of treatment to control standardized DOC (RDOCstd) vs. ratio of treatment to control standardized hydrogen ion concentration (RHstd) for all samples collected in 2009-2011 merged by region (a, b) and soil type (c, d). Filled circles represent samples from acid treatment plots, open circles samples from alkaline treatment plots (mean of four replicates in each case). Trend lines shown are of the form RDOCstd = 1/(RHstdb), with b fitted to each dataset by weighted least squares regression (see Methods, Table 2). Solid trend lines show fit to full dataset, dashed trend lines show fit to data after excluding data from the Migneint podzol alkaline treatment.
    istex:99B0E1402508235E3DDDFC59CB5201098E7A3CB9
    UK Natural Environment Research Council - No. AQ0803; No. NE/E011837/1
  • Descrição: 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.
  • Editor: Oxford: Blackwell Publishing Ltd
  • Idioma: Inglês
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