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dc.contributor.authorPerez-Quezada, Jorge F.
dc.contributor.authorSaliendra, Nicanor Z.
dc.contributor.authorAkshalov, Kanat
dc.contributor.authorJohnson, Douglas A.
dc.contributor.authorLaca, Emilio
dc.date.accessioned2020-09-05T06:50:24Z
dc.date.available2020-09-05T06:50:24Z
dc.date.issued2010-01-01
dc.identifier.citationPerez-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.
dc.identifier.issn0022-409X
dc.identifier.doi10.2111/08-106.1
dc.identifier.urihttp://hdl.handle.net/10150/642767
dc.description.abstractA 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. 
dc.language.isoen
dc.publisherSociety for Range Management
dc.relation.urlhttps://rangelands.org/
dc.rightsCopyright © Society for Range Management.
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectabandoned fields
dc.subjectKazakh steppe
dc.subjectnet ecosystem exchange
dc.subjectnonlinear modeling
dc.subjectwater-use efficiency
dc.subjectwheat
dc.titleLand Use Influences Carbon Fluxes in Northern Kazakhstan
dc.typetext
dc.typeArticle
dc.identifier.journalRangeland Ecology & Management
dc.description.collectioninformationThe Rangeland Ecology & Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information.
dc.eprint.versionFinal published version
dc.description.admin-noteMigrated from OJS platform August 2020
dc.source.volume63
dc.source.issue1
dc.source.beginpage82-93
refterms.dateFOA2020-09-05T06:50:24Z


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