SIMETAW模型在辽西北地区的验证与应用

 【目的】验证美国加州大学开发的作物蒸散量－SIMETAW（simulation of evapotranspiration of applied water）模型在中国辽西北地区应用的有效性。【方法】利用辽西北地区的作物、土壤和气候数据运行模型,将当地主要作物蒸散量的模型模拟值与田间实测值进行对比分析;同时,在模型验证的基础上模拟分析当地主要作物生育期内蒸散量和所需灌水量的多年平均情况。【结果】主要作物生育时期内模型模拟的蒸散强度曲线和实测曲线变化趋势基本一致,蒸散总量模拟值和实测值比较接近,相对误差均在10％之内。利用模型模拟当地玉米、大豆和谷子生育期内蒸散量多年平均值分别为514.15、449.64和389.12 mm,所需灌水量分别为208.4、220.93和116.17 mm。【结论】SIMETAW模型在辽西北地区对玉米、大豆和谷子蒸散量的模拟比较准确,模型有效,可以进一步应用该模型开展作物的水分管理研究和指导灌溉。

Test and Preliminary Application of the SIMETAW Model in Northwest of Liaoning

【Objective】 The aim of this paper is to test the validity of SIMETAW (simulation of evapotranspiration of applied water) model developed by the University of California in Northwest of Liaoning Province, China. 【Method】 The comparison with model simulated and field measured evapotranspiration of maize, soybean and millet in northwest of Liaoning province were conducted, as well the analysis of the historical evapotranspiration and water demand of local main crops by applying the tested SIMETAW model were completed. 【Result】 The results showed that the model have good performances in simulating dynamic of main crops’ evapotranspiration intensity in northwest of Liaoning, and the simulated total evapotranspiration was very close to the field measured data, the relative error between the comparison was less than 10%. Based on the model simulation, the simulated multi-years’ average evapotranspiration for maize, soybean and millet during the growth stage were 514.15, 449.64 and 389.12 mm respectively, and the water demand for these three crop were respectively 208.4, 220.93 and 116.17 mm. 【Conclusion】 SIMETAW model has well validity on simulating the evapotranspiration of maize, soybean and millet in northwest of Liaoning province. The model can be further applied to water management study and guide irrigation in this region.