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    Using Bulk Soil Radiocarbon Measurements to Estimate Soil Organic Matter Turnover Times: Implications for Atmospheric CO2 Levels

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    Author
    Harrison, Kevin G.
    Issue Date
    1996-01-01
    Keywords
    models
    atmosphere
    composition
    ecosystems
    soils
    organic compounds
    organic materials
    C 14
    carbon
    isotopes
    radioactive isotopes
    carbon dioxide
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    Citation
    Harrison, K. G. (1996). Using bulk soil radiocarbon measurements to estimate soil organic matter turnover times: Implications for atmospheric CO2 levels. Radiocarbon, 38(2), 181-190.
    Publisher
    Department of Geosciences, The University of Arizona
    Journal
    Radiocarbon
    URI
    http://hdl.handle.net/10150/653784
    DOI
    10.1017/S0033822200017550
    Additional Links
    http://radiocarbon.webhost.uits.arizona.edu/
    Abstract
    Although soil contains about three times the amount of carbon present in the preindustrial atmosphere, determining how perturbations (e.g., changing land use, CO2 fertilization, changing climate and anthropogenic nitrogen deposition) alter soil carbon storage and influence atmospheric CO2 levels has proved elusive. Not knowing the soil carbon turnover times causes part of this uncertainty. I outline a strategy for using radiocarbon measurements to estimate soil organic matter turnover times and inventories in native soil. The resulting estimates of carbon exchange produce reasonable agreement with measurements of CO2 fluxes from soil. Furthermore, derivatives of the model are used to explore soil carbon dynamics of cultivated and recovering soil. Because the models can reproduce observed soil 14C measurements in native, cultivated, and recovering ecosystems (i.e., the underlying assumptions appear reasonable), the native model was modified to estimate the potential rate of additional carbon storage because of CO2 fertilization. This process may account for 45-65% of the "missing CO2 sink."
    Type
    Article
    text
    Language
    en
    ISSN
    0033-8222
    ae974a485f413a2113503eed53cd6c53
    10.1017/S0033822200017550
    Scopus Count
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    Radiocarbon, Volume 38, Number 2 (1996)

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