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    • Rangeland Ecology & Management, Volume 63, Number 1 (January 2010)
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    Land Use Influences Carbon Fluxes in Northern Kazakhstan

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    Author
    Perez-Quezada, Jorge F.
    Saliendra, Nicanor Z.
    Akshalov, Kanat
    Johnson, Douglas A.
    Laca, Emilio
    Issue Date
    2010-01-01
    Keywords
    abandoned fields
    Kazakh steppe
    net ecosystem exchange
    nonlinear modeling
    water-use efficiency
    wheat
    
    Metadata
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    Citation
    Perez-Quezada, J. F., Saliendra, N. Z., Akshalov, K., Johnson, D. A., & Laca, E. A. (2010). Land use influences carbon fluxes in northern Kazakhstan. Rangeland Ecology & Management, 63(1), 82-93.
    Publisher
    Society for Range Management
    Journal
    Rangeland Ecology & Management
    URI
    http://hdl.handle.net/10150/642767
    DOI
    10.2111/08-106.1
    Additional Links
    https://rangelands.org/
    Abstract
    A mobile, closed-chamber system (CC) was used to measure carbon and water fluxes on four land-use types common in the Kazakh steppe ecoregion. Land uses represented crop (wheat or barley, WB), abandoned land (AL), crested wheatgrass (CW), and virgin land (VL). Measurements were conducted during the growing season of 2002 in northern Kazakhstan at three locations (blocks) 15-20 km apart. The CC allowed the measurement of the carbon flux components of net ecosystem exchange (NEE), ecosystem respiration (RE) and soil respiration (RS), together with evapotranspiration (ET). Nonlinear regression analyses were used to model gross primary production (GPP) and ET as a function of photosynthetically active radiation (Q); RE and RS were modeled based on air (Tair) and soil (Ts) temperature, respectively. GPP, RE, RS, and ET were estimated for the entire year with the use of continuous 20-min means of Q, Tair, and Ts. Annual NEE indicated that AL gained 536 g CO2 m-2, WB lost – 191 g CO2 m-2, CW was near equilibrium (–14g CO2 m-2), and VL exhibited considerable carbon accumulation (153g CO2 m-2). The lower GPP values of the land-use types dominated by native species (CW and VL) compared to WB and AL were compensated by positive NEE values that were maintained during a longer growing season. As expected, VL and CW allocated a larger proportion of their carbon assimilates belowground. Non-growing-season RE accounted for about 19% of annual RE in all land-use types. The results of this landscape-level study suggest that carbon lost by cultivation of VLs is partially being restored when fields are left uncultivated, and that VLs are net sinks of carbon. Estimations of carbon balances have important management implications, such as estimation of ecosystem productivity and carbon credit certification. 
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2111/08-106.1
    Scopus Count
    Collections
    Rangeland Ecology & Management, Volume 63, Number 1 (January 2010)

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