节水农业中作物水分管理基本理论问题的探讨

Discussion on crop water management for water saving agriculture

本文分析了玉米、小麦生育期内光合速率的变化规律，论述了土壤水分亏缺对光合作用的影响，建立了水分亏缺对光合作用影响的定量评价指标，探讨了作物光合作用与水分散失的关系及作物水分利用效率的变化规律，据此论述了节水农业中的作物水分管理问题．

In this paper,the varying law of photosynthesis rate of winter wheat and summer corn in growing seasons are analyzed based on the measured data of irrigation experiment station of Northwestern Agricultural University which using LI-6200 phototsynthesis system.The effect of soil moisture deficit on photosynthnesis is studied and the quantitative evaluation index of the effect of water deficit is established.Furthermore the relationship between photosynthesis and transpiration and the varying laws of water use efficiency are analyzed.At last,the management of field water for water saving agriculture have been discussed.