中文摘要：

为了更好的分析整个作物生育期不同时期水分亏缺对作物产量的影响,该文在分析作物水分生产函数中水分敏感指数及其累积函数特性的基础上,对目前广泛应用的水分敏感指数累积函数进行了改进。改进后的累积函数与原累积函数在作物生长中期差异较小,而在作物生长前期和后期差异相对较大。改进后的累积函数物理概念上更符合实际,能够模拟作物水分敏感指数累积值从生长开始到生育期结束的变化过程。利用山西潇河试验站冬小麦和广西桂林试验站晚稻非充分灌溉试验数据进行了验证,改进后的累积函数模拟的水分敏感指数累积值与通过试验观测产量优化求解值吻合较好,且与原累积函数相比具有较好的模拟效果。

英文摘要：

In order to analysis the influence of water deficit on crop production,the characteristics of the crop water sensitive index in crop-water production function model and its cumulative curve were analyzed,and widely used cumulative function of crop water sensitive index was improved.The improved cumulative function had little differences of the former one during the middle growth stage,but the differences were significant in the early and late growth stage.The improved cumulative function could be used to simulate the changes of cumulative value of crop water sensitive index during the whole growth stage continuously.The improvement was verified by crop production and evapotranspiration data from deficit irrigation experiments of winter wheat in Xiaohe of Shanxi Province and late paddy rice in Guilin of Guangxi Province.The simulated cumulative value of crop water sensitive index using the improved function accord well with the measure value,its have better simulation effect than the former function.