SEBAL application to estimate water use efficiency of Pistachio trees in saline condition (Case study: Bahadoran Plain, Iran)
Journal Title: Journal of Biodiversity and Environmental Sciences (JBES) - Year 2017, Vol 10, Issue 6
Abstract
Annual evapotranspiration (ET) of mature pistachio tress in saline aquifer of Bahadoran plain in central Iran was first estimated on a distributed basis by running the Surface Energy Balance Algorithm for Land (SEBAL) model through Landsat 8 satellite data. Finally, the SEBAL estimate of annual water use evaluated by performing water balance analysis over the Bahadoran irrigation district. The water balance ETa estimate was 19% larger than the SEBAL-based ETa due to the uncertainties involved in estimation of Leaching Fraction (LF) parameter. The average LF was estimated to be 28% (with standard deviation of 19%), predominantly higher than the anticipated average leaching requirement of the Bahadoran area (23%). Assuming that SEBAL has provided accurate estimates, 64% of cumulative irrigation depth (792mm of 1242mm) was consumed by the evapotranspiration process of pistachio orchards. Moreover, the average annual released water to the Bahadoran irrigation district seems to be adequate to leach the salts down to the root zone. The latter result depends on the irrigation water salinities as well as per irrigation applied depths which may change from a field to another field and cause to over or under irrigation of pistachio orchards. Such possible under or over irrigations were demonstrated by the fluctuations of leaching fractions (3% to 65%), soil salinities (1.73 to 31.6 dS∙m-1) and consequently, the yields (500 to 4200 kg.ha-1). Under such a condition, averages of 0.12kg.m-3 and 0.20 kg.m-3 obtain for water use efficiency and evapotranspiration use efficiency of Bahadoran pistachios, respectively.
Authors and Affiliations
Mohammad Hassan Rahimian, Mohammad Shayannejad, Saeid Eslamian, Mahdi Gheysari, Reza Jafari
Keywords
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