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    Energy Partitioning and Evapotranspiration over a Rice Paddy in Southern Brazil

    Source: Journal of Hydrometeorology:;2014:;Volume( 015 ):;issue: 005::page 1975
    Author:
    Timm, Andrea Ucker
    ,
    Roberti, Débora R.
    ,
    Streck, Nereu Augusto
    ,
    Gustavo G. de Gonçalves, Luis
    ,
    Acevedo, Otávio Costa
    ,
    Moraes, Osvaldo L. L.
    ,
    Moreira, Virnei S.
    ,
    Degrazia, Gervásio Annes
    ,
    Ferlan, Mitja
    ,
    Toll, David L.
    DOI: 10.1175/JHM-D-13-0156.1
    Publisher: American Meteorological Society
    Abstract: uring approximately 80% of its growing season, lowland flooded irrigated rice ecosystems in southern Brazil are kept within a 5?10-cm water layer. These anaerobic conditions have an influence on the partitioning of the energy and water balance components. Furthermore, this cropping system differs substantially from any other upland nonirrigated or irrigated crop ecosystems. In this study, daily, seasonal, and annual dynamics of the energy and water balance components were analyzed over a paddy rice farm in a subtropical location in southern Brazil using eddy covariance measurements. In this region, rice is grown once a year in low wetlands while the ground is kept fallow during the remaining of the year. Results show that the energy budget residual corresponded to up to 20% of the net radiation during the rice-growing season and around 10% for the remainder of the year (fallow). The energy and water balance analysis also showed that because of the high water table in the region, soil was near saturation most of the time, and latent heat flux dominated over sensible heat flux by up to one order of magnitude in some cases. The estimate of evapotranspiration ET using the crop coefficient multiplied by the reference evapotranspiration KcETo and the Penman?Monteith equation ETPM, describing the canopy resistance through leaf area index (LAI) obtained by remote sensing, represent well the measured evapotranspiration, mainly in the fallow periods. Therefore, using a specific crop parameter like LAI and crop height can be an easy and interesting alternative to estimate ET in vegetated lowland areas.
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      Energy Partitioning and Evapotranspiration over a Rice Paddy in Southern Brazil

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    contributor authorTimm, Andrea Ucker
    contributor authorRoberti, Débora R.
    contributor authorStreck, Nereu Augusto
    contributor authorGustavo G. de Gonçalves, Luis
    contributor authorAcevedo, Otávio Costa
    contributor authorMoraes, Osvaldo L. L.
    contributor authorMoreira, Virnei S.
    contributor authorDegrazia, Gervásio Annes
    contributor authorFerlan, Mitja
    contributor authorToll, David L.
    date accessioned2017-06-09T17:15:26Z
    date available2017-06-09T17:15:26Z
    date copyright2014/10/01
    date issued2014
    identifier issn1525-755X
    identifier otherams-81945.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4225004
    description abstracturing approximately 80% of its growing season, lowland flooded irrigated rice ecosystems in southern Brazil are kept within a 5?10-cm water layer. These anaerobic conditions have an influence on the partitioning of the energy and water balance components. Furthermore, this cropping system differs substantially from any other upland nonirrigated or irrigated crop ecosystems. In this study, daily, seasonal, and annual dynamics of the energy and water balance components were analyzed over a paddy rice farm in a subtropical location in southern Brazil using eddy covariance measurements. In this region, rice is grown once a year in low wetlands while the ground is kept fallow during the remaining of the year. Results show that the energy budget residual corresponded to up to 20% of the net radiation during the rice-growing season and around 10% for the remainder of the year (fallow). The energy and water balance analysis also showed that because of the high water table in the region, soil was near saturation most of the time, and latent heat flux dominated over sensible heat flux by up to one order of magnitude in some cases. The estimate of evapotranspiration ET using the crop coefficient multiplied by the reference evapotranspiration KcETo and the Penman?Monteith equation ETPM, describing the canopy resistance through leaf area index (LAI) obtained by remote sensing, represent well the measured evapotranspiration, mainly in the fallow periods. Therefore, using a specific crop parameter like LAI and crop height can be an easy and interesting alternative to estimate ET in vegetated lowland areas.
    publisherAmerican Meteorological Society
    titleEnergy Partitioning and Evapotranspiration over a Rice Paddy in Southern Brazil
    typeJournal Paper
    journal volume15
    journal issue5
    journal titleJournal of Hydrometeorology
    identifier doi10.1175/JHM-D-13-0156.1
    journal fristpage1975
    journal lastpage1988
    treeJournal of Hydrometeorology:;2014:;Volume( 015 ):;issue: 005
    contenttypeFulltext
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