Energy Partitioning and Evapotranspiration over a Rice Paddy in Southern BrazilSource: Journal of Hydrometeorology:;2014:;Volume( 015 ):;issue: 005::page 1975Author: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-13-0156.1Publisher: 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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contributor author | Timm, Andrea Ucker | |
contributor author | Roberti, Débora R. | |
contributor author | Streck, Nereu Augusto | |
contributor author | Gustavo G. de Gonçalves, Luis | |
contributor author | Acevedo, Otávio Costa | |
contributor author | Moraes, Osvaldo L. L. | |
contributor author | Moreira, Virnei S. | |
contributor author | Degrazia, Gervásio Annes | |
contributor author | Ferlan, Mitja | |
contributor author | Toll, David L. | |
date accessioned | 2017-06-09T17:15:26Z | |
date available | 2017-06-09T17:15:26Z | |
date copyright | 2014/10/01 | |
date issued | 2014 | |
identifier issn | 1525-755X | |
identifier other | ams-81945.pdf | |
identifier uri | http://onlinelibrary.yabesh.ir/handle/yetl/4225004 | |
description 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. | |
publisher | American Meteorological Society | |
title | Energy Partitioning and Evapotranspiration over a Rice Paddy in Southern Brazil | |
type | Journal Paper | |
journal volume | 15 | |
journal issue | 5 | |
journal title | Journal of Hydrometeorology | |
identifier doi | 10.1175/JHM-D-13-0156.1 | |
journal fristpage | 1975 | |
journal lastpage | 1988 | |
tree | Journal of Hydrometeorology:;2014:;Volume( 015 ):;issue: 005 | |
contenttype | Fulltext |