Flux of carbon from 14C-enriched leaf litter throughout a forest soil mesocosm

Mats Fröberg, Paul J. Hanson, Susan E. Trumbore, Christopher W. Swanston, Donald E. Todd

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Abstract

The role of DOC for the build-up of soil organic carbon pools is still not well known, but it is thought to play a role in the transport of carbon to a greater depth where it becomes more stable. The aim of this study was to elucidate within-year dynamics of carbon transport from litter to the O (Oe and Oa) and A horizons. Mesocosms with constructed soil profiles were used to study dynamics of C transport from 14C-enriched (about 1000‰) leaf litter to the Oe/Oa and A horizons as well as the mineralization of leaf litter. The mesocosms were placed in the field for 17 months during which time fluxes and 14C content of DOC and CO2 were measured. Changes in 14C in leaf litter and bulk soil C pools were also recorded. Significant simultaneous release and immobilization of DOC occurring in both the O and A horizons was hypothesized. Contrary to our hypothesis, DOC released from the labeled Oi horizon was not retained within the Oe/Oa layer. DOC originating in the unlabeled Oe/Oa layer was also released for transport. Extensive retention of DOC occurred in the A horizon. DOC leaching from A horizon consisted of a mix of DOC from different sources, with a main fraction originating in the A horizon and a smaller fraction leached from the overlaying horizons. The C and 14C budget for the litter layer also indicated a surprisingly large amount of carbon with ambient Δ14C-signature to be respired from this layer. Data for this site also suggested significant contributions from throughfall to dissolved organic carbon (DOC) transport into and respiration from the litter layer. The results from this study showed that DOC retention was low in the O horizon and therefore not important for the O horizon carbon budget. In the A horizon DOC retention was extensive, but annual DOC input was small compared to C stocks and therefore not important for changes in soil C on an annual timescale.

Original languageEnglish
Pages (from-to)181-188
Number of pages8
JournalGeoderma
Volume149
Issue number3-4
DOIs
StatePublished - Mar 15 2009

Funding

Funding for the EBIS project was provided by the U.S. Department of Energy (DOE), Office of Science, Biological and Environmental Research, as a part of the Terrestrial Carbon Processes Program. Oak Ridge National Laboratory (ORNL) is managed by UT-Battelle, LLC, for the DOE under contract DE-AC05-00OR22725. Work at Lawrence Livermore National Laboratory (LLNL) was performed under the auspices of the DOE by the University of California, LLNL, under Contract no. W-7405-Eng-48. We wish to thank Tom Guilderson, Lawrence Livermore National Laboratory, for analyses of 14 C.

Keywords

  • Dissolved organic carbon
  • Forest soil
  • Radiocarbon
  • Soil organic carbon

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