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The response of dissolved organic carbon (DOC) and the ecosystem carbon balance to experimental drought in a temperate shrubland. / Sowerby, A.; Emmett, B.A.; Williams, D.; Beier, Claus; Evans, C.D.

In: European Journal of Soil Science, Vol. 61, No. 5, 2010, p. 697-709.

Publication: Research - peer-reviewJournal article – Annual report year: 2010

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Sowerby, A.; Emmett, B.A.; Williams, D.; Beier, Claus; Evans, C.D. / The response of dissolved organic carbon (DOC) and the ecosystem carbon balance to experimental drought in a temperate shrubland.

In: European Journal of Soil Science, Vol. 61, No. 5, 2010, p. 697-709.

Publication: Research - peer-reviewJournal article – Annual report year: 2010

Bibtex

@article{48796af30cbe42158932b20e9f6df2f9,
title = "The response of dissolved organic carbon (DOC) and the ecosystem carbon balance to experimental drought in a temperate shrubland",
keywords = "Bio systems, Environment and climate, Miljø og klima, Biosystemer",
publisher = "Wiley-Blackwell Publishing Ltd.",
author = "A. Sowerby and B.A. Emmett and D. Williams and Claus Beier and C.D. Evans",
year = "2010",
doi = "10.1111/j.1365-2389.2010.01276.x",
volume = "61",
number = "5",
pages = "697--709",
journal = "European Journal of Soil Science",
issn = "1351-0754",

}

RIS

TY - JOUR

T1 - The response of dissolved organic carbon (DOC) and the ecosystem carbon balance to experimental drought in a temperate shrubland

A1 - Sowerby,A.

A1 - Emmett,B.A.

A1 - Williams,D.

A1 - Beier,Claus

A1 - Evans,C.D.

AU - Sowerby,A.

AU - Emmett,B.A.

AU - Williams,D.

AU - Beier,Claus

AU - Evans,C.D.

PB - Wiley-Blackwell Publishing Ltd.

PY - 2010

Y1 - 2010

N2 - Climate change has been proposed as a driver of carbon (C) loss from the large pool of C held in soils. Aqueous (dissolved organic carbon, DOC) and gaseous (soil respiration or net ecosystem CO2 exchange) forms of C loss from soils have been considered. Under some climate change scenarios, gaseous emissions of C have been predicted to result in terrestrial ecosystems becoming a net source of C by 2050. Indeed, both forms of C loss have been linked to climate-related changes, such as warming and/or changes in precipitation. In our field-based drought manipulation experiment on an upland moorland in northeast Wales, we have carried out an annual drought treatment for 8 years, reducing levels of annual rainfall by 23% on average (1999–2007) through the use of automated roofs, which prevent rain falling on experimental plots between June and September annually. Following 5 years of repeated summer drought, there was a 26% increase in concentrations of DOC in soil water in the mineral soil in the drought plots and this further increased to 52% after 8 years. A similar pattern was not observed in the organic soil horizons. Despite higher DOC concentrations in the mineral soil horizon, decreased drainage of water from the drought-treated soils resulted in an overall decrease of 9% in total DOC export. Calculating the carbon (C) balance for the below-ground component of the ecosystem reveals that DOC represents 3% of gross C export. Previous studies at the site have demonstrated large increases in soil respiration resulting from the repeated drought treatment. By including data presented here with other C fluxes and pool measurements from the site, we demonstrate that soil carbon is accumulating by 126 g C m−2 year−1 in the control plots, but decreasing by 18 g C m2 year−1 in the drought plots. The repeated drought treatment has thus resulted in the ecosystem switching from a net sink for C into a net source.

AB - Climate change has been proposed as a driver of carbon (C) loss from the large pool of C held in soils. Aqueous (dissolved organic carbon, DOC) and gaseous (soil respiration or net ecosystem CO2 exchange) forms of C loss from soils have been considered. Under some climate change scenarios, gaseous emissions of C have been predicted to result in terrestrial ecosystems becoming a net source of C by 2050. Indeed, both forms of C loss have been linked to climate-related changes, such as warming and/or changes in precipitation. In our field-based drought manipulation experiment on an upland moorland in northeast Wales, we have carried out an annual drought treatment for 8 years, reducing levels of annual rainfall by 23% on average (1999–2007) through the use of automated roofs, which prevent rain falling on experimental plots between June and September annually. Following 5 years of repeated summer drought, there was a 26% increase in concentrations of DOC in soil water in the mineral soil in the drought plots and this further increased to 52% after 8 years. A similar pattern was not observed in the organic soil horizons. Despite higher DOC concentrations in the mineral soil horizon, decreased drainage of water from the drought-treated soils resulted in an overall decrease of 9% in total DOC export. Calculating the carbon (C) balance for the below-ground component of the ecosystem reveals that DOC represents 3% of gross C export. Previous studies at the site have demonstrated large increases in soil respiration resulting from the repeated drought treatment. By including data presented here with other C fluxes and pool measurements from the site, we demonstrate that soil carbon is accumulating by 126 g C m−2 year−1 in the control plots, but decreasing by 18 g C m2 year−1 in the drought plots. The repeated drought treatment has thus resulted in the ecosystem switching from a net sink for C into a net source.

KW - Bio systems

KW - Environment and climate

KW - Miljø og klima

KW - Biosystemer

U2 - 10.1111/j.1365-2389.2010.01276.x

DO - 10.1111/j.1365-2389.2010.01276.x

JO - European Journal of Soil Science

JF - European Journal of Soil Science

SN - 1351-0754

IS - 5

VL - 61

SP - 697

EP - 709

ER -