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应用作物水分生产函数Ｊｅｎｓｅｎ模型的关键是确定模型中的水分敏感指数，本文提出水分敏感指数累积函数的概念．在分析已有成果的基础上，用生长曲线来描述敏感指数的累积函数，并给出了参数的求解方法．利用４个站年的冬小麦耗水量资料，对所提出的方法进行了检验．结果表明，用生长曲线来拟合敏感指数累积函数能较好地描述冬小麦产量对水分的反应．
The key to apply the Jensen model of crop water production function is to determine the water-sensitive index in the model. This paper presents the concept of the cumulative function of water-sensitive index. Based on the analysis of the existing results, the growth curve is used to describe the cumulative function of the sensitive index, and the method of solving the parameter is given. The proposed method was tested using the winter wheat water consumption data for four years. The results showed that fitting the sensitivity index cumulative function with the growth curve can better describe the response of winter wheat yield to water.