Determining water use of sorghum from two-source energy balance and radiometric temperatures

作者：Sanchez J M^*; Lopez Urrea R; Rubio E; Caselles V

来源：Hydrology and Earth System Sciences, 2011, 15(10): 3061-3070.

DOI：10.5194/hess-15-3061-2011

Estimates of surface actual evapotranspiration (ET) can assist in predicting crop water requirements. An alternative to the traditional crop-coefficient methods are the energy balance models. The objective of this research was to show how surface temperature observations can be used, together with a two-source energy balance model, to determine crop water use throughout the different phenological stages of a crop grown. Radiometric temperatures were collected in a sorghum (Sorghum bicolor) field as part of an experimental campaign carried out in Barrax, Spain, during the 2010 summer growing season. Performance of the Simplified Two-Source Energy Balance (STSEB) model was evaluated by comparison of estimated ET with values measured on a weighing lysimeter. Errors of +/- 0.14 mm h(-1) and +/- 1.0 mm d(-1) were obtained at hourly and daily scales, respectively. Total accumulated crop water use during the campaign was underestimated by 5 %. It is then shown that thermal radiometry can provide precise crop water necessities and is a promising tool for irrigation management.

• 出版日期2011