钦灵灌区主要作物生育期灌溉需水量特征分析OA

Based on the daily meteorological data from 1957 to 2022 collected by the Lingshan County Meteorologi-cal Station,the Penman-Monteith formula and the segmented crop coefficient method recommended by the Food and Agriculture Organization of the United Nations(FAO)were used to calculate the water demands during the growth periods of major crops in the Qinling Irrigation Zone.Combined with effective precipitation,the irrigation wa-ter demand was calculated.The results showed that:① The annual evapotranspiration of reference crops in the Qin-ling Irrigation Zone ranged from 1088.2 to 1374.2 mm,with a multi-year average of 1190.78 mm.The evapotranspi-ration of reference crops showed a slow increasing trend,with a growth rate of 2.77 mm/10a.② There were signifi-cant differences in the water demands during the growth periods of early rice,late rice,sugarcane,and curcuma ze-doary,all of which showed a slow increasing trend.The multi-year average water demands were 436.0～999.64 mm.③The multi-year average irrigation water demands for early rice,late rice,sugarcane,and curcuma zedoary were 234.80～520.54 mm.The irrigation water demands showed a slow increasing trend,with an increase rate of 2.45～4.16 mm/10a.