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    Bowen ratio versus canopy chamber CO2 fluxes on sagebrush rangeland

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    Author
    Johnson, D. A.
    Saliendra, N. Z.
    Walker, J. W.
    Hendrickson, J. R.
    Issue Date
    2003-09-01
    Keywords
    research methods
    carbon dioxide fluxes
    Artemisia tripartita
    biogeochemical cycles
    Artemisia
    accuracy
    plant ecology
    carbon dioxide
    energy balance
    steppes
    Idaho
    seasonal variation
    rangelands
    canopy
    Artemisia spp.
    carbon dioxide fluxes
    CO2 exchange
    Bowen ratio
    canopy chambers
    closed chambers
    micrometeorology
    rangelands
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    Citation
    Johnson, D. A., Saliendra, N. Z., Walker, J. W., & Hendrickson, J. R. (2003). Bowen ratio versus canopy chamber CO2 fluxes on sagebrush rangeland. Journal of Range Management, 56(5), 517-523.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/643472
    DOI
    10.2307/4003844
    10.2458/azu_jrm_v56i5_johnson
    Additional Links
    https://rangelands.org/
    Abstract
    Because of their expansiveness, sagebrush (Artemisia spp.)-steppe rangelands could contribute significantly to the global carbon budget. However, it is important to determine if there are differences between methods for determining CO2 fluxes on these rangelands. The objective of this study was to compare the Bowen ratio-energy balance and canopy chamber techniques for measuring CO2 fluxes in a sagebrush-steppe ecosystem. A Bowen ratio-energy balance system was installed at a sagebrush-steppe site near Dubois, Ida., U.S.A to continuously measure the vertical gradients of air temperature, water vapor, and CO2 concentration in conjunction with associated micrometeorological characteristics. The canopy chamber technique, which employed a 1-m2 (1,020 liter) clear plexiglass/plastic film chamber in combination with a portable gas exchange system, was used periodically during May through August across 4 years (1996-1999) to obtain instantaneous measurements of CO2 fluxes across 3 replicate blocks during a 2-min. measurement period. For the same measurement dates and times across the 4 years of study, CO2 fluxes ranged from -0.22 to 0.55 mg m-2 sec-1 for the Bowen ratio-energy balance technique and from -0.18 to 0.48 mg m-2 sec-1 for the canopy chamber technique. Estimates of CO2 fluxes by the 2 techniques were not statistically different (P > 0.05) for the early (May) and mid-season (June to mid-July) portions of the growing season; however, fluxes measured by the 2 techniques were significantly different (P 0.05) for the late-season period (late-July to late-August). Despite this difference during the hot-dry, late-season period, flux estimates from the 2 techniques were significantly and positively correlated during the early (r2 = 0.71), mid- (r2 = 0.88), and late- (r2 = 0.72) season periods. Thus, both techniques showed similar patterns of CO2 fluxes at our sagebrush-steppe study site across 4 years of study, although caution should be used when the canopy chamber technique is used during hot, dry conditions.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4003844
    Scopus Count
    Collections
    Journal of Range Management, Volume 56, Number 5 (September 2003)

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