本文根据广西桂林地区灌溉试验中心站1988年以来的五年观测试验成果。分析研究适用于我国南方的水稻水分生产函数模型。探讨各种模型中水分敏感性参数的变化规律，提出水稻水分生产函数随水文年度呈规律性变化的观点，特别是具体提出了Jensen模型中水分敏感指数与参照作物需水量的关系。为拓宽水分生产函数应用的时空范围提依据及方法。

Based on the analysis of the experimental data, the models of water-production function (WPF) for rice, which can be applied to both northern and southern parts of China, are investigated The regularity ofthe variation of water sensitivity parameters in various models has been discussed It is suggested that Jensen model is the applicable model of WPF for rice in China The regularity of the variation of water sensitivity index λ. in Jensen model with the hydrology yeats and regions, especially, the relationship between. λ and the reference evapotranspiration ETO has been presented Thus. the principle and methods for widening the ranges of time and space for applying WPF of rice have been established.

水稻是中国最主要的粮食作物之一。其产量约占粮食作物总产量的40%；在全国约1.1×10∧8hm2的粮食作物总面积中。稻田面积约占28%。20世纪80年代以来。水稻产区的水资源短缺已成为当地农业生产中的重要问题，各地试验、开发、应用与推广了许多种水稻节水灌溉模式。文章根据这些新的水稻灌溉模式试验结果与推广经验，将我国水稻节水灌溉主要模式归纳为浅、湿、晒结合，闻歇淹水，半旱栽培和蓄雨型等4类、阐述了这些模式的田问水分控制标准以及节水、增产和提高水分生产率的潜力；提出了该4类模式的选择原则以及应用这些模式时应注意的问题；分析、讨论了推广这些模式能够持续节水与提高水分生产率的机理以及对环境的影响。

21世纪初学者期，我国将以空前的规模发展节水灌溉事业，计划安排大量的全国性节水灌溉项目。为了合理、高效地开展这些项目的规划、设计、建设与运行管理工作，使其节水效果好、经济效益高。提出了应注意以下五方面原则性的技术问题：节水灌溉的涵叉与目的、技术措施体系、尺度效应、效果评估指标体系、主攻方向。文中对这些问题进行了具体论述。

In the Hetao Irrigation Districts of the Ningxia autonomous region, Upper Yellow River Basin, the "con-tinuous deep flooding irrigation" method is used for the rice paddies. The field irrigation water use during the rice-growing season is two to three times higher than in other regions of North China where water-saving practices have been introduced. This paper, based on the data measured in experimental rice fields and sub-branch canal systems, presents main results concerning crop evapotranspira-tion, percolation and irrigation requirements for deep and shallow water irrigation. Causes for water waste relate to both the lack of regulation in supply and distribution canals and to the poor management of paddy fields. The potential for water saving is discussed using water bal-ance data. Improved irrigation techniques and water man-agement strategies, including the shallow water irrigation method, are suggested considering the expected impacts and benefits. Replacing the current continuous deep flood-ing with the shallow-ponded water irrigation method may reduce the growing season irrigation water use from 1,405 to 820mm in average, with a likely increase in yields of 450kg/ha. Water productivity would then increase from 0.49 to 1.03kg/m3. Adopting improved canal manage-ment and modernization of regulation and control struc-tures may lead to decreasing the gross irrigation demand from the present 3,100mm to about 1,280mm, which would highly benefit the environmental conditions in the area.