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    Spatiotemporal Variations in Growing Season Exchanges of CO2, H2O, and Sensible Heat in Agricultural Fields of the Southern Great Plains

    Source: Earth Interactions:;2007:;volume( 011 ):;issue: 017::page 1
    Author:
    Fischer, Marc L.
    ,
    Billesbach, David P.
    ,
    Berry, Joseph A.
    ,
    Riley, William J.
    ,
    Torn, Margaret S.
    DOI: 10.1175/EI231.1
    Publisher: American Meteorological Society
    Abstract: Climate, vegetation cover, and management create finescale heterogeneity in unirrigated agricultural regions, with important but not well-quantified consequences for spatial and temporal variations in surface CO2, water, and heat fluxes. Eddy covariance fluxes were measured in seven agricultural fields?comprising winter wheat, pasture, and sorghum?in the U.S. Southern Great Plains (SGP) during the 2001?03 growing seasons. Land cover was the dominant source of variation in surface fluxes, with 50%?100% differences between fields planted in winter?spring versus fields planted in summer. Interannual variation was driven mainly by precipitation, which varied more than twofold between years. Peak aboveground biomass and growing season net ecosystem exchange (NEE) of CO2 increased in rough proportion to precipitation. Based on a partitioning of gross fluxes with a regression model, ecosystem respiration increased linearly with gross primary production, but with an offset that increased near the time of seed production. Because the regression model was designed for well-watered periods, it successfully retrieved NEE and ecosystem parameters during the peak growing season and identified periods of moisture limitation during the summer. In summary, the effects of crop type, land management, and water limitation on carbon, water, and energy fluxes were large. Capturing the controlling factors in landscape-scale models will be necessary to estimate the ecological feedbacks to climate and other environmental impacts associated with changing human needs for agricultural production of food, fiber, and energy.
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      Spatiotemporal Variations in Growing Season Exchanges of CO2, H2O, and Sensible Heat in Agricultural Fields of the Southern Great Plains

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4216188
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    • Earth Interactions

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    contributor authorFischer, Marc L.
    contributor authorBillesbach, David P.
    contributor authorBerry, Joseph A.
    contributor authorRiley, William J.
    contributor authorTorn, Margaret S.
    date accessioned2017-06-09T16:47:02Z
    date available2017-06-09T16:47:02Z
    date copyright2007/10/01
    date issued2007
    identifier otherams-74010.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4216188
    description abstractClimate, vegetation cover, and management create finescale heterogeneity in unirrigated agricultural regions, with important but not well-quantified consequences for spatial and temporal variations in surface CO2, water, and heat fluxes. Eddy covariance fluxes were measured in seven agricultural fields?comprising winter wheat, pasture, and sorghum?in the U.S. Southern Great Plains (SGP) during the 2001?03 growing seasons. Land cover was the dominant source of variation in surface fluxes, with 50%?100% differences between fields planted in winter?spring versus fields planted in summer. Interannual variation was driven mainly by precipitation, which varied more than twofold between years. Peak aboveground biomass and growing season net ecosystem exchange (NEE) of CO2 increased in rough proportion to precipitation. Based on a partitioning of gross fluxes with a regression model, ecosystem respiration increased linearly with gross primary production, but with an offset that increased near the time of seed production. Because the regression model was designed for well-watered periods, it successfully retrieved NEE and ecosystem parameters during the peak growing season and identified periods of moisture limitation during the summer. In summary, the effects of crop type, land management, and water limitation on carbon, water, and energy fluxes were large. Capturing the controlling factors in landscape-scale models will be necessary to estimate the ecological feedbacks to climate and other environmental impacts associated with changing human needs for agricultural production of food, fiber, and energy.
    publisherAmerican Meteorological Society
    titleSpatiotemporal Variations in Growing Season Exchanges of CO2, H2O, and Sensible Heat in Agricultural Fields of the Southern Great Plains
    typeJournal Paper
    journal volume11
    journal issue17
    journal titleEarth Interactions
    identifier doi10.1175/EI231.1
    journal fristpage1
    journal lastpage21
    treeEarth Interactions:;2007:;volume( 011 ):;issue: 017
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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