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根据甘肃张掖2007年田间试验数据,利用Penman-Monteith公式和农田水量平衡法,计算了春小麦、春玉米、马铃薯三种单作种植模式的需水特征和作物系数。结果表明:不同种植模式需水量不同,充分灌溉下,春玉米需水量最大,各种植模式需水模比系数最大值均出现在作物生育后期;从全生育期作物系数平均值来看,春玉米(0.96)>春小麦(0.84)>马铃薯(0.83),作物系数最大值均出现在作物生育中后期,各种植模式作物系数在生育期内明显呈现“单峰”变化趋势。
According to the 2007 field experiment data of Zhangye in Gansu Province, the water requirement characteristics and crop coefficients of spring wheat, spring maize and potato under three single cropping patterns were calculated by Penman-Monteith formula and farmland water balance method. The results showed that the water requirement of different planting modes was different. Under sufficient irrigation, the spring maize had the largest water requirement, and the maximum water requirement modulus ratio of all planting modes appeared in the later stage of crop growth. From the average of all crop growth stages, (0.96)> spring wheat (0.84)> potato (0.83). The maximum crop coefficient appeared in the middle and late stages of crop growth. The crop coefficients of all cropping patterns showed a “single peak” trend during the growth period.