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    Heterotrophic respiration in disturbed forests : a review with examples from North America

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    2010JG001495.pdf (2.450Mb)
    Date
    2011-05-14
    Author
    Harmon, Mark E.  Concept link
    Bond-Lamberty, Benjamin  Concept link
    Tang, Jianwu  Concept link
    Vargas, Rodrigo  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4629
    As published
    https://doi.org/10.1029/2010JG001495
    DOI
    10.1029/2010JG001495
    Keyword
     Carbon dynamics; Decomposition; Disturbance; Ecosystems 
    Abstract
    Heterotrophic respiration (RH) is a major process releasing carbon to the atmosphere and is essential to understanding carbon dynamics in terrestrial ecosystems. Here we review what is known about this flux as related to forest disturbance using examples from North America. The global RH flux from soils has been estimated at 53–57 Pg C yr−1, but this does not include contributions from other sources (i.e., dead wood, heart-rots). Disturbance-related inputs likely account for 20–50% of all RH losses in forests, and disturbances lead to a reorganization of ecosystem carbon pools that influences how RH changes over succession. Multiple controls on RH related to climate, the material being decomposed, and the decomposers involved have been identified, but how each potentially interacts with disturbance remains an open question. An emerging paradigm of carbon dynamics suggests the possibility of multiple periods of carbon sinks and sources following disturbance; a large contributing factor is the possibility that postdisturbance RH does not always follow the monotonic decline assumed in the classic theory. Without a better understanding and modeling of RH and its controlling factors, it will be difficult to estimate, forecast, understand, and manage carbon balances of regions in which disturbance frequency and severity are changing. Meeting this challenge will require (1) improved field data on processes and stores, (2) an improved understanding of the physiological and environmental controls of RH, and (3) a more formal analysis of how model structure influences the RH responses that can be predicted.
    Description
    Author Posting. © American Geophysical Union, 2011. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 116 (2011): G00K04, doi:10.1029/2010JG001495.
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    • Ecosystems Center
    Suggested Citation
    Journal of Geophysical Research 116 (2011): G00K04
     

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