Biogeochemistry

, Volume 108, Issue 1, pp 91–107

Simulation of carbon cycling, including dissolved organic carbon transport, in forest soil locally enriched with 14C

  • E. Tipping
  • P. M. Chamberlain
  • M. Fröberg
  • P. J. Hanson
  • P. M. Jardine
Article

DOI: 10.1007/s10533-011-9575-1

Cite this article as:
Tipping, E., Chamberlain, P.M., Fröberg, M. et al. Biogeochemistry (2012) 108: 91. doi:10.1007/s10533-011-9575-1

Abstract

The DyDOC model was used to simulate the soil carbon cycle of a deciduous forest at the Oak Ridge Reservation (Tennessee, USA). The model application relied on extensive data from the Enriched Background Isotope Study (EBIS), which exploited a short-term local atmospheric enrichment of radiocarbon to establish a large-scale manipulation experiment with different inputs of 14C from both above-ground and below-ground litter. The model was first fitted to hydrological data, then observed pools and fluxes of carbon and 14C data were used to fit parameters describing metabolic transformations of soil organic matter (SOM) components and the transport and sorption of dissolved organic matter (DOM). This produced a detailed quantitative description of soil C cycling in the three horizons (O, A, B) of the soil profile. According to the parameterised model, SOM turnover within the thin O-horizon rapidly produces DOM (46 gC m−2 a−1), which is predominantly hydrophobic. This DOM is nearly all adsorbed in the A- and B-horizons, and while most is mineralised relatively quickly, 11 gC m−2 a−1 undergoes a “maturing” reaction, producing mineral-associated stable SOM pools with mean residence times of 100–200 years. Only a small flux (~1 gC m−2 a−1) of hydrophilic DOM leaves the B-horizon. The SOM not associated with mineral matter is assumed to be derived from root litter, and turns over quite quickly (mean residence time 20–30 years). Although DyDOC was successfully fitted to C pools, annual fluxes and 14C data, it accounted less well for short-term variations in DOC concentrations.

Keywords

14CCarbonCyclingDissolved organic carbonDissolved organic matterDyDOC modelEnriched Background Isotope StudyLitter manipulationSoil

Supplementary material

10533_2011_9575_MOESM1_ESM.doc (380 kb)
Supplementary material 1 (DOC 380 kb)

Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • E. Tipping
    • 1
  • P. M. Chamberlain
    • 1
  • M. Fröberg
    • 2
    • 3
  • P. J. Hanson
    • 3
  • P. M. Jardine
    • 4
  1. 1.Centre for Ecology and HydrologyLancaster Environment CentreLancasterUK
  2. 2.Department of Soil and EnvironmentSLU – Sveriges LantbruksuniversitetUppsalaSweden
  3. 3.Environmental Sciences DivisionOak Ridge National LaboratoryOak RidgeUSA
  4. 4.Biosystems Engineering and Soil Science Department, Institute for a Secure and Sustainable EnvironmentUniversity of TennesseeKnoxvilleUSA