考虑随机降雨时稻田高效节水灌溉制度

在分析水稻生育阶段水分生产函数中敏感指数变化规律的基础上，导出了敏感指数累积函数模型及分旬敏感指数值。以此为基础，将降雨视为随机变量，结合高效节水灌溉条件下稻田水量平衡的特点，充分考虑水稻实际腾发、稻田渗漏和稻田水分实际消退过程，建立了随机降雨情况下，求解稻田高效节水优化灌溉制度的随机动态规划模型。实例研究表明，模型及求解方法合理可行。

The optimum irrigation scheduling for rice with stochastic rainfallunder limited water supply

Base on the analysis of water sensitivity parameters(WSP)of dated water production function for rice,the function of cumulative WSP,which can be used to calculate the WSP of different time period,was established.The optimum irrigation scheduling with stochastic rainfall for rice under limited water supply was investigated by using the stochastic dynamic programming (SDP) model.Real evaprtranspiraton,seepage and other water movements in the paddy fields have been considered in the SDP model.A case study shows that the SDP model is economical and feasible.