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Biogeochemistry

, Volume 108, Issue 1–3, pp 135–148 | Cite as

Elevated air carbon dioxide concentrations increase dissolved carbon leaching from a cropland soil

  • Jan Siemens
  • Andreas Pacholski
  • Katia Heiduk
  • Anette Giesemann
  • Ulrike Schulte
  • René Dechow
  • Martin Kaupenjohann
  • Hans-Joachim Weigel
Article

Abstract

Increasing leaching losses of carbon from soils due to accelerated weathering and increasing concentrations of dissolved carbon as a result of intensified soil respiration are suspected to provide a negative feedback on rising atmospheric CO2 concentrations. We tested this hypothesis by studying concentrations of dissolved carbon and groundwater recharge at the Braunschweig free air carbon dioxide enrichment (FACE) experiment under winter wheat and winter barley. Dissolved carbon concentrations under elevated atmospheric CO2 and ambient conditions were rather similar and not consistently higher under FACE. An analysis of δ13C signatures suggested that dissolved organic and inorganic carbon contained 9–29% (DOC) and 26–49% (DIC) of “new” carbon originating from CO2 added to the FACE rings. Dissolved inorganic carbon additionally contained 15–42% of carbonate-derived C. A 15% reduction in evapotranspiration under elevated CO2 increased groundwater recharge by 60 mm or 55%, which was the main driver for an observed 81% increase in dissolved carbon leaching from 2.7 to 4.9 g C m−2 year−1 at 90 cm depth. Our results suggest that future changes of dissolved carbon leaching losses will be mainly governed by changes in climate and groundwater recharge and to a lesser extent by increasing dissolved carbon concentrations.

Keywords

Free air carbon dioxide enrichment Dissolved organic carbon Dissolved inorganic carbon Net biome productivity Net ecosystem carbon balance Carbon sequestration 

Notes

Acknowledgments

This project was partly funded by the German Research Foundation (Grant SI 1106/2-1). The FACE experiment was financed by the German Ministry of Food, Agriculture and Consumer Protection (BMELV). Support of the Brookhaven National Laboratory Upton, NY, USA and the staff of the Institute of Biodiversity of the Johann Heinrich von Thünen-Institute is gratefully acknowledged. We thank Franz Josef Löpmeier and Harald Braden of the German Meteorological Service for providing weather data, soil water contents, and drainage volumes of lysimeters at the Braunschweig site, as well as the Institute of Soil Science, University of Hohenheim and Christine Ehrlicher for determination of soil carbon contents, and Beate Gehnen for measuring the δ13C values of DIC. We acknowledge the suggestions of two anonymous reviewers that helped to improve the manuscript.

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Jan Siemens
    • 1
    • 2
  • Andreas Pacholski
    • 3
    • 4
  • Katia Heiduk
    • 3
  • Anette Giesemann
    • 3
  • Ulrike Schulte
    • 5
  • René Dechow
    • 3
  • Martin Kaupenjohann
    • 1
  • Hans-Joachim Weigel
    • 3
  1. 1.Department of Soil ScienceTechnische Universität BerlinBerlinGermany
  2. 2.Institute of Crop Science and Resource Conservation, Soil ScienceUniversity of BonnBonnGermany
  3. 3.Johann Heinrich von Thünen-InstitutFederal Research Institute for Rural Areas, Forestry and FisheriesBraunschweigGermany
  4. 4.Institute of Crop Science and Plant BreedingChristian-Albrechts-Universität zu KielKielGermany
  5. 5.Institute of Geology, Mineralogy and GeophysicsRuhr-Universität BochumBochumGermany

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