Multivariable regression models of reference crop evapotranspiration and the spatial distributions in Xinjiang
LIAO Yi-Qun-1, LI Yi-1, Robert Horton2, CUI Chen-Feng-1
(1.College of Water Resource and Architectural Engineering, Northwest A ＆ F University, Yangling, Shaanxi 712100, China; 2.Department of Agronomy, Iowa State University, Iowa 50011, USA)
Abstract：Meteorological dates of 42 weather stations in Xinjiang were used to estimate ET0 at daily and monthly time scales by using Penman-Monteith equation.Multiplevariable regressions of ET0 in terms of 4 major climatic elements were conducted to obtain empirical equations for calculating ET0.Combining with the spatial analysis function of code ArcGIS,the coefficients of the empirical regression formulas for whole Xinjiang were interpolated based on the regression formulas in 42 stations;consequently the spatial distribution of those coefficients was obtained.The results indicated that the spatial distributions of ET0 were obviously varied across Xinjiang both at daily and monthly scales.And the values of ET0 in southern part of Xinjiang were significantly larger than those in northern.It was reasonable and reliable to use the multiplevariable regression formulas to estimate ET0 in different parts of Xinjiang.Because the empirical formulas are simpler than Penman-Monteith equation and with relatively high accuracy,they have fairly promoting values and good application prospects.For the regions without meteorological data,by using the coefficient plots proposed in the paper,ET0 values in those regions can be estimated at a given time scale.
廖轶群, 李毅, Robert Horton, 崔晨风. 新疆参考作物腾发量多元回归模型及空间分布[J]. 排灌机械工程学报, 2012, 30(1): 117-124.
LIAO Yi-Qun, LI Yi, Robert Horton, CUI Chen-Feng. Multivariable regression models of reference crop evapotranspiration and the spatial distributions in Xinjiang. Journal of Drainage and Irrigation Machinery Engin, 2012, 30(1): 117-124.
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