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ARS Home Plains Area Bushland, Texas Conservation and Production Research Laboratory Soil and Water Management Research Research Publications at this Location





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Title:   Author  item
                                            Colaizzi, Paulitem
                                            AGAM, NURIT - Gilat Research Centeritem
                                            Tolk, Judyitem
                                            Evett, Steven

                                                         - *Steve*item
                                            O`Shaughnessy, Susanitem
                                            Gowda, Prasannaitem
                                            Howell, Terryitem
                                            Kustas, William

                                                         - *Bill*item
                                            Anderson, Martha
  Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 7/27/2012
                                    Publication  Date: 10/23/2012
                                    Citation: Colaizzi, P.D., Agam, N., Tolk, J.A., Evett, S.R., Oshaughnessy, S.A., Gowda, P., Howell, T.A., Kustas, W.P., Anderson, M.C. 2012. Recent advances in the two source energy balance model to calculate E.T. and ET for row crops [abstract]. ASA-CSSA-SSSA Annual Meeting Abstracts. 2012 CDROM. Paper No 204-2.Interpretive Summary: Crops use water in two different ways, evaporation and transpiration. Most evaporation is from the soil, and transpiration is from the plant. Only transpiration contributes directly to plant growth, but soil evaporation does not. Therefore, water can be conserved by reducing soil evaporation. Both evaporation and transiration are difficult to measure. Instead, they can be calculated using a mathematical model. We improved an existing model for this purpose. The model can be used to test different methods that might reduce soil evaporation of crops. This presentation reviews these improvements, and discusses improvements that are still needed.
                                Technical Abstract: Calculation of evaporation (E), transpiration (T), and evapotranspiration (ET) are fundamental to assess strategies and tactics that might improve crop water productivity in both irrigated and dryland production systems. One approach to calculate E, T, and ET is by a two-source energy balance model (TSEB), which calculates the energy budget of the soil and canopy separately. A remote sensing-based TSEB has been developed that only requires a single measurement of directional surface brightness temperature, commonly available meteorological variables, and measurements or estimates of crop phenology. Recent advances in the TSEB have addressed several aspects that relate to the non-random spatial distribution of row crop vegetation, the unique view geometries of ground-based remote sensing platforms, and the wide range of meteorological conditions that are typical of semiarid, advective climates. These advances were applied to the TSEB and tested against measurements of E, T, and ET using microlysimeters, sap flow gauges, and large weighing lysimeters, respectively. This presentation will review these advances and discuss needs for future research.


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