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中文摘要：
采用扩展后的INFIL3．0模型计算了石津灌区根区层下净入渗补给量和潜在入渗补给系数，并分析了其时空变化规律。计算结果显示，石津灌区多年平均净入渗补给量为79mm，多年平均潜在入渗补给系数为0．135；根区层下净入渗补给量和潜在入渗补给系数的空间变异性主要表现为渠灌区〉井渠双灌区〉井灌区，时间变异性表现为入渗补给量峰值出现在强降雨期间。最后，从水量均衡要素的角度分析了入渗补给过程，表明降雨是引起入渗补给的主要因素，当前灌溉制度是合理的。
英文摘要：
In this paper, the improved INFIL3.0 model is used to evaluate the net infiltration and potential recharge coefficient across the lower boundary of the root zone in the Shijin Irrigation District and analyze the temporal and spatial variation. The calculation re- sults show the annual average net infiltration is 79 mm and that the annual average potential recharge coefficient is 0. 135 in the Shijin Irrigation District. The net infiltration and potential recharge coefficient in the surface water irrigation area are both larger than those in the groundwater irrigation area, and the net infiltration and potential recharge coefficient in the area irrigated with surface water combined with groundwater are in the middle of that in the areas irrigated with surface water and groundwater. The peak of net infil- tration appears in the intense rainfall period. The process of infiltration recharge is analyzed from the water balance, and it is shown that the rainfall is the main factor causing the infiltration recharge and that the current irrigation system is reasonable.
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