摘要： 1986～1990四个年度研究结果显示，叶水势日变化因供水及生育时期而不同。黎明前叶水势随生育进程而变化，开花期出现明显低谷，与土壤水分动态变化不一致；午后叶水势具有规律的阶段性变化，且因不同水文年型出现年际间差异。叶水势与土壤含水量呈曲线关系，随生育进程，叶水势与深层土壤水分的相关性增强。开花期叶水势与产量关系最为密切。前控式节水栽培可通过渗透调节维持较高膨压而高产。提出了不同水文年型高产节水主要生育期午后叶水势下限指标。

关键词: 冬小麦, 节水, 叶水势, 土壤水分

Abstract: Based on 4-years' study during 1986 to 1990,diurnal changes in leaf water potential varied with water amount and timing, and growth stages.Changes in leaf water potential with growth advance showed that sharp declines in pre-dawn leaf water potential occurred at the anthesis stage.This was inconsistent with the changein soil water content.Mid-day leaf water potential changed periodically and varied among years with different seasonal rainfall.There was a curvilinear relation between leaf water potential and soil water content,and the correlation of leaf Water potential to soil water content in deeper layers increased with growth stage.There was a close relation between leaf water potential at the anthesis stage and yield.Water-saving practice by early stress could allow wheat to achieve high yield by induced osmotic regulation and turgor maintenance.Thresholds of mid-day leaf water potential at major growth stages for water saving and high yield were suggested based on seasonal rainfall patterns.

Key words: Winter wheat,Water-saving, Pre-dawn leaf water potential, Mid-day leaf water potential, Soil water content

中图分类号: 

• S512.101