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    Terrestrial C sequestration at elevated CO2 and temperature : the role of dissolved organic N loss

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    Rastetter+MS.pdf (323.0Kb)
    Date
    2004-06-07
    Author
    Rastetter, Edward B.  Concept link
    Perakis, Steven S.  Concept link
    Shaver, Gaius R.  Concept link
    Agren, Goran I.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/314
    As published
    https://doi.org/10.1890/03-5303
    Keyword
     Carbon–nitrogen interactions; Carbon sequestration; Dissolved inorganic nitrogen; Dissolved organic nitrogen; Ecosystem models; Global climate change; Carbon–nitrogen interactions; Terrestrial ecosystems 
    Abstract
    We used a simple model of carbon–nitrogen (C–N) interactions in terrestrial ecosystems to examine the responses to elevated CO2 and to elevated CO2 plus warming in ecosystems that had the same total nitrogen loss but that differed in the ratio of dissolved organic nitrogen (DON) to dissolved inorganic nitrogen (DIN) loss. We postulate that DIN losses can be curtailed by higher N demand in response to elevated CO2, but that DON losses cannot. We also examined simulations in which DON losses were held constant, were proportional to the amount of soil organic matter, were proportional to the soil C:N ratio, or were proportional to the rate of decomposition. We found that the mode of N loss made little difference to the short-term (<60 years) rate of carbon sequestration by the ecosystem, but high DON losses resulted in much lower carbon sequestration in the long term than did low DON losses. In the short term, C sequestration was fueled by an internal redistribution of N from soils to vegetation and by increases in the C:N ratio of soils and vegetation. This sequestration was about three times larger with elevated CO2 and warming than with elevated CO2 alone. After year 60, C sequestration was fueled by a net accumulation of N in the ecosystem, and the rate of sequestration was about the same with elevated CO2 and warming as with elevated CO2 alone. With high DON losses, the ecosystem either sequestered C slowly after year 60 (when DON losses were constant or proportional to soil organic matter) or lost C (when DON losses were proportional to the soil C:N ratio or to decomposition). We conclude that changes in long-term C sequestration depend not only on the magnitude of N losses, but also on the form of those losses.
    Description
    Author's draft titled: Carbon sequestration in terrestrial ecosystems under elevated CO2 and temperature : role of dissolved organic versus inorganic nitrogen loss
     
    Author Posting. © The Authors, 2004. This is the author's version of the work. It is posted here by permission of Ecological Society of America for personal use, not for redistribution. The definitive version was published in Ecological Applications 15 (2005): 71–86, doi:10.1890/03-5303
     
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    Suggested Citation
    Preprint: Rastetter, Edward B., Perakis, Steven S., Shaver, Gaius R., Agren, Goran I., "Terrestrial C sequestration at elevated CO2 and temperature : the role of dissolved organic N loss", 2004-06-07, https://doi.org/10.1890/03-5303, https://hdl.handle.net/1912/314
     

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