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

Marta  Camino-Serrano; Elisabeth  Graf Pannatier; Sara Vicca; Sebastiaan  Luyssaert; Mathieu  Jonard; Philippe  Ciais; Bertrand  Guenet; Bert Gielen; Josep Peñuelas; Jordi Sardans; Peter Waldner; Sophia Etzold; Guia Cecchini; Nicholas Clarke; Zoran Gali; Laure Gandois; Karin Hansen; Jim Johnson; Uwe Klinck; Zora Lachmanová; Antti-Jussi Lindroos; Henning Meesenburg; Tiina M. Nieminen; Tanja G. M. Sanders; Kasia Sawicka; Walter Seidling; Anne Thimonier; Elena Vanguelova; Arne Verstraeten; Lars Vesterdal; Ivan A. Janssens

doi:10.5194/bg-13-5567-2016

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

Marta Camino-Serrano, Elisabeth Graf Pannatier, Sara Vicca, Sebastiaan Luyssaert, Mathieu Jonard, Philippe Ciais, Bertrand Guenet, Bert Gielen, Josep Peñuelas, Jordi Sardans, Peter Waldner, Sophia Etzold, Guia Cecchini, Nicholas Clarke, Zoran Gali, Laure Gandois, Karin Hansen, Jim Johnson, Uwe Klinck, Zora LachmanováAntti-Jussi Lindroos, Henning Meesenburg, Tiina M. Nieminen, Tanja G. M. Sanders, Kasia Sawicka, Walter Seidling, Anne Thimonier, Elena Vanguelova, Arne Verstraeten, Lars Vesterdal, Ivan A. Janssens

Forest, Nature and Biomass

11 Citations (Scopus)

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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 physicochemical 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 Europe. 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 (NO₃^-) 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 deposition 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, longterm 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.

Original language	English
Journal	Biogeosciences
Volume	13
Issue number	19
Pages (from-to)	5567-5585
Number of pages	19
ISSN	1726-4170
DOIs	https://doi.org/10.5194/bg-13-5567-2016
Publication status	Published - 7 Oct 2016

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Trends in soil solution dissolved organic carbon (DOC) concentrations across EuropeanFinal published version, 7.56 MBLicence: CC BY

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Camino-Serrano, M., Graf Pannatier, E., Vicca, S., Luyssaert, S., Jonard, M., Ciais, P., Guenet, B., Gielen, B., Peñuelas, J., Sardans, J., Waldner, P., Etzold, S., Cecchini, G., Clarke, N., Gali, Z., Gandois, L., Hansen, K., Johnson, J., Klinck, U., ... Janssens, I. A. (2016). Trends in soil solution dissolved organic carbon (DOC) concentrations across European forests. Biogeosciences, 13(19), 5567-5585. https://doi.org/10.5194/bg-13-5567-2016

Camino-Serrano, M, Graf Pannatier, E, Vicca, S, Luyssaert, S, Jonard, M, Ciais, P, Guenet, B, Gielen, B, Peñuelas, J, Sardans, J, Waldner, P, Etzold, S, Cecchini, G, Clarke, N, Gali, Z, Gandois, L, Hansen, K, Johnson, J, Klinck, U, Lachmanová, Z, Lindroos, A-J, Meesenburg, H, Nieminen, TM, Sanders, TGM, Sawicka, K, Seidling, W, Thimonier, A, Vanguelova, E, Verstraeten, A, Vesterdal, L & Janssens, IA 2016, 'Trends in soil solution dissolved organic carbon (DOC) concentrations across European forests', Biogeosciences, vol. 13, no. 19, pp. 5567-5585. https://doi.org/10.5194/bg-13-5567-2016

@article{467260702ee3416687afcc656a0af6f6,

title = "Trends in soil solution dissolved organic carbon (DOC) concentrations across European forests",

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 physicochemical 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 Europe. 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 (NO3-) deposition and increasing trends in DOC concentrations with decreasing mean sulfate (SO2-4) deposition, with the magnitude of these relationships depending on plot deposition history. While the attribution of increasing trends in DOC to the reduction of SO2-4 deposition 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, longterm trends of soil solution DOC reflected the interactions between controls acting at local (soil and vegetation properties) and regional (atmospheric deposition of SO2-4 and inorganic N) scales.",

author = "Marta Camino-Serrano and {Graf Pannatier}, Elisabeth and Sara Vicca and Sebastiaan Luyssaert and Mathieu Jonard and Philippe Ciais and Bertrand Guenet and Bert Gielen and Josep Pe{\~n}uelas and Jordi Sardans and Peter Waldner and Sophia Etzold and Guia Cecchini and Nicholas Clarke and Zoran Gali and Laure Gandois and Karin Hansen and Jim Johnson and Uwe Klinck and Zora Lachmanov{\'a} and Antti-Jussi Lindroos and Henning Meesenburg and Nieminen, {Tiina M.} and Sanders, {Tanja G. M.} and Kasia Sawicka and Walter Seidling and Anne Thimonier and Elena Vanguelova and Arne Verstraeten and Lars Vesterdal and Janssens, {Ivan A.}",

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T1 - Trends in soil solution dissolved organic carbon (DOC) concentrations across European forests

AU - Camino-Serrano, Marta

AU - Graf Pannatier, Elisabeth

AU - Vicca, Sara

AU - Luyssaert, Sebastiaan

AU - Jonard, Mathieu

AU - Ciais, Philippe

AU - Guenet, Bertrand

AU - Gielen, Bert

AU - Peñuelas, Josep

AU - Sardans, Jordi

AU - Waldner, Peter

AU - Etzold, Sophia

AU - Cecchini, Guia

AU - Clarke, Nicholas

AU - Gali, Zoran

AU - Gandois, Laure

AU - Hansen, Karin

AU - Johnson, Jim

AU - Klinck, Uwe

AU - Lachmanová, Zora

AU - Lindroos, Antti-Jussi

AU - Meesenburg, Henning

AU - Nieminen, Tiina M.

AU - Sanders, Tanja G. M.

AU - Sawicka, Kasia

AU - Seidling, Walter

AU - Thimonier, Anne

AU - Vanguelova, Elena

AU - Verstraeten, Arne

AU - Vesterdal, Lars

AU - Janssens, Ivan A.

PY - 2016/10/7

Y1 - 2016/10/7

N2 - 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 physicochemical 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 Europe. 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 (NO3-) deposition and increasing trends in DOC concentrations with decreasing mean sulfate (SO2-4) deposition, with the magnitude of these relationships depending on plot deposition history. While the attribution of increasing trends in DOC to the reduction of SO2-4 deposition 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, longterm trends of soil solution DOC reflected the interactions between controls acting at local (soil and vegetation properties) and regional (atmospheric deposition of SO2-4 and inorganic N) scales.

AB - 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 physicochemical 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 Europe. 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 (NO3-) deposition and increasing trends in DOC concentrations with decreasing mean sulfate (SO2-4) deposition, with the magnitude of these relationships depending on plot deposition history. While the attribution of increasing trends in DOC to the reduction of SO2-4 deposition 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, longterm trends of soil solution DOC reflected the interactions between controls acting at local (soil and vegetation properties) and regional (atmospheric deposition of SO2-4 and inorganic N) scales.

U2 - 10.5194/bg-13-5567-2016

DO - 10.5194/bg-13-5567-2016

M3 - Journal article

SN - 1726-4170

VL - 13

SP - 5567

EP - 5585

JO - Biogeosciences

JF - Biogeosciences

IS - 19

ER -

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

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