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Article Dans Une Revue Biogeosciences Année : 2016

Trends in soil solution dissolved organic carbon (DOC) concentrations across European forests

Marta Camino-Serrano
  • Fonction : Auteur
Elisabeth Graf Pannatier
  • Fonction : Auteur
Sara Vicca
Mathieu Jonard
  • Fonction : Auteur
Josep Peñuelas
Peter Waldner
  • Fonction : Auteur
Sophia Etzold
  • Fonction : Auteur
Guia Cecchini
  • Fonction : Auteur
Zora Galić
  • Fonction : Auteur
Karin Hansen
  • Fonction : Auteur
Jim Johnson
  • Fonction : Auteur
Uwe Klinck
  • Fonction : Auteur
Zora Lachmanová
  • Fonction : Auteur
Antti-Jussi Lindroos
  • Fonction : Auteur
Henning Meesenburg
  • Fonction : Auteur
Tanja G. M. Sanders
  • Fonction : Auteur
Kasia Sawicka
  • Fonction : Auteur
Walter Seidling
  • Fonction : Auteur
Anne Thimonier
  • Fonction : Auteur
Elena Vanguelova
  • Fonction : Auteur
Arne Verstraeten
  • Fonction : Auteur
Ivan A. Janssens

Résumé

Published by Copernicus Publications on behalf of the European Geosciences Union. 5568 M. Camino-Serrano et al.: Trends in soil solution dissolved organic carbon Abstract. Dissolved organic carbon (DOC) in surface waters is connected to DOC in soil solution through hydrological pathways. Therefore, it is expected that long-term dynamics of DOC in surface waters reflect DOC trends in soil solution. However, a multitude of site studies have failed so far to establish consistent trends in soil solution DOC, whereas increasing concentrations in European surface waters over the past decades appear to be the norm, possibly as a result of recovery from acidification. The objectives of this study were therefore to understand the long-term trends of soil solution DOC from a large number of European forests (ICP Forests Level II plots) and determine their main physico-chemical and biological controls. We applied trend analysis at two levels: (1) to the entire European dataset and (2) to the individual time series and related trends with plot characteristics , i.e., soil and vegetation properties, soil solution chemistry and atmospheric deposition loads. Analyses of the entire dataset showed an overall increasing trend in DOC concentrations in the organic layers, but, at individual plots and depths, there was no clear overall trend in soil solution DOC. The rate change in soil solution DOC ranged between −16.8 and +23 % yr −1 (median = +0.4 % yr −1) across Eu-rope. The non-significant trends (40 %) outnumbered the increasing (35 %) and decreasing trends (25 %) across the 97 ICP Forests Level II sites. By means of multivariate statistics , we found increasing trends in DOC concentrations with increasing mean nitrate (NO − 3) deposition and increasing trends in DOC concentrations with decreasing mean sulfate (SO 2− 4) deposition, with the magnitude of these relationships depending on plot deposition history. While the attribution of increasing trends in DOC to the reduction of SO 2− 4 deposi-tion could be confirmed in low to medium N deposition areas, in agreement with observations in surface waters, this was not the case in high N deposition areas. In conclusion, long-term trends of soil solution DOC reflected the interactions between controls acting at local (soil and vegetation properties) and regional (atmospheric deposition of SO 2− 4 and inorganic N) scales.
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Dates et versions

hal-01587571 , version 1 (27-10-2020)

Identifiants

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Marta Camino-Serrano, Elisabeth Graf Pannatier, Sara Vicca, Sebastiaan Luyssaert, Mathieu Jonard, et al.. Trends in soil solution dissolved organic carbon (DOC) concentrations across European forests. Biogeosciences, 2016, 13 (19), pp.5567 - 5585. ⟨10.5194/bg-13-5567-2016⟩. ⟨hal-01587571⟩
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