Trends in soil solution dissolved organic carbon (DOC) concentrations across European forests
Camino Serrano, Marta (Department of Biology. University of Antwerp. Belgium)
Graf Pannatier, Elisabeth (Swiss Federal Institute for Forest. Snow and Landscape Research)
Vicca, Sara (Department of Biology. University of Antwerp. Belgium)
Luyssaert, Sebastiaan (Université Paris-Saclay. Laboratoire des Sciences du Climat et de l'Environnement)
Jonard, Mathieu (Université catholique de Louvain. Earth and Life Institute. Belgium)
Ciais, Philippe (Université Paris-Saclay. Laboratoire des Sciences du Climat et de l'Environnement)
Guenet, Bertrand (Université Paris-Saclay. Laboratoire des Sciences du Climat et de l'Environnement)
Gielen, Bert (Department of Biology. University of Antwer. Belgium)
Peñuelas, Josep (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia)
Sardans i Galobart, Jordi (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Waldner, Peter (Swiss Federal Institute for Forest. Snow and Landscape Research)
Etzold, Sophia (Swiss Federal Institute for Forest. Snow and Landscape Research)
Cecchini, Guia (Department of Earth Sciences. University of Florence. Italy)
Clarke, Nicholas (Norwegian Institute of Bioeconomy Research. Norway)
Galié, Zoran (Institute of Lowland Forestry and Environment. University of Novi Sad. Serbia)
Gandois, Laure (EcoLab. Université de Toulouse. France)
Hansen, Karin (Swedish Environmental Research Institute. Sweden)
Johnson, Jim (University College Dublin. Ireland)
Klinck, Uwe (Northwest German Forest Research Institute. Germany)
Lachmanová, Zora (Forestry and Game Management Research Institute. Czech Republic)
Lindroos, Antti-Jussi (Natural Resources Institute. Finland)
Meesenburg, Henning (Northwest German Forest Research Institute. Germany)
Nieminen, Tiina M. (Natural Resources Institute. Finland)
Sanders, Tanja G. M. (Thünen Institute of Forest Ecosystems. Germany)
Sawicka, Kasia (Wageningen University. Netherlands)
Seidling, Walter (Thünen Institute of Forest Ecosystems. Germany)
Thimonier, Anne (Swiss Federal Institute for Forest. Snow and Landscape Research)
Vanguelova, Elena (Alice Holt Research Forest. England)
Verstraeten, Arne (Research Institute for Nature and Forest (Brusel·les, Bèlgica))
Vesterdal, Lars (University of Copenhagen. Department of Geosciences and Natural Resource Management. Denmark)
Janssens, Ivan (Department of Biology. University of Antwerp, Belgium)

Date:	2016
Abstract:	Dissolved organic carbon (DOC) in soil solution is connected to DOC in surface waters through hydrological flows. 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 has 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 from acidification recovery. 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 analys is 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 across Europe with temporal slopes of soil solution DOC ranging between −16. 8 % yr⁻¹ and +23 % yr⁻¹ (median= +0. 4 % yr⁻¹). 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 DOC concentrations with increasing mean nitrate (NO₃⁻) deposition and decreasing DOC concentrations with decreasing me an sulphate (SO₄²⁻) deposition, with the magnitude of these relationships depending on plot deposition history. While the attribution of increasing trends in DOC to the reduct ion of SO₄²⁻ deposition could be confirmed in N-poorer forests, in agreement with observations in surface waters, this was not the case in N-richer forests. 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 SO₄²⁻ and inorganic N) scales.
Grants:	European Commission 610028 European Commission 505539 European Commission LIFE07 ENV/D/000218
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Dissolved organic carbon ; Europe ; Forest
Published in:	Biogeosciences, Vol. 13, Issue 19 (October 2016) , p. 5567-5585, ISSN 1726-4189

DOI: 10.5194/bg-13-5567-2016

19 p, 7.5 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals) > Imbalance-P
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