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    • Rangeland Ecology & Management, Volume 63 (2010)
    • Rangeland Ecology & Management, Volume 63, Number 1 (January 2010)
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    Net Carbon Fluxes Over Burned and Unburned Native Tallgrass Prairie

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    Author
    Bremer, Dale J.
    Ham, Jay M.
    Issue Date
    2010-01-01
    Keywords
    conditional sampling
    fire
    grasslands
    Konza Prairie
    land management
    net ecosystem exchange
    
    Metadata
    Show full item record
    Citation
    Bremer, D. J., & Ham, J. M. (2010). Net carbon fluxes over burned and unburned native tallgrass prairie. Rangeland Ecology & Management, 63(1), 72-81.
    Publisher
    Society for Range Management
    Journal
    Rangeland Ecology & Management
    URI
    http://hdl.handle.net/10150/642766
    DOI
    10.2111/REM-D-09-00010.1
    Additional Links
    https://rangelands.org/
    Abstract
    Prescribed burning of aboveground biomass in tallgrass prairie is common and may influence dynamics and magnitudes of carbon (C) movement between the surface and atmosphere. Carbon dioxide (CO2) fluxes were measured for 2 yr using conditional sampling systems on two adjacent watersheds in an ungrazed tallgrass prairie near Manhattan, Kansas. One watershed was burned annually (BA) and the other biennially (BB). Leaf and soil CO2 fluxes were measured in the source area. Net ecosystem exchange (NEE) of CO2 reached a maximum daily gain of 26.4 g CO2 m-2 d-1 (flux toward surface is positive) in July 1998 (year when both sites were burned and precipitation was above normal); gains were similar between sites in 1998. The maximum daily NEE loss of CO2 was 221.8 g CO2 m-2 d-1 from BA in September 1997 (year when only BA was burned and precipitation was below normal). When data were integrated over the two years, both sites were net sources of atmospheric CO2; NEE was –389 g C m-2 2 yr-1 on BA and –195 g C m-2 2 yr-1 on BB. Burning increased canopy size and photosynthesis, but the greater photosynthesis was offset by corresponding increases in respiration (from canopy and soil). Carbon losses from fire represented 6-10% of annual CO2 emissions (bulk came from soil and canopy respiration). Data suggest that annual burning promotes C loss compared to less-frequently burned tallgrass prairie where prairie is not grazed by ungulates. Greater precipitation in 1998 caused large increases in biomass and a more positive growing season NEE, indicating that C sequestration appears more likely when precipitation is high. Because C inputs (photosynthesis) and losses (canopy and soil respiration) were large, small measurement or modeling errors could confound attempts to determine if the ecosystems are long-term CO2 sources or sinks. 
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2111/REM-D-09-00010.1
    Scopus Count
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    Rangeland Ecology & Management, Volume 63, Number 1 (January 2010)

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