冬小麦叶水势变化规律研究

Experimental Research on the Change Law of Leaf Water Potential of Winter Wheat

[目的]准确采用叶水势来反映作物的水分亏缺程度。[方法]采用WESCOR公司生产的PSYPRO水势系统,测定冬小麦生育期内叶水势的值,并分析研究生育期内叶水势的变化规律及有代表性生育期内的日变化规律。[结果]在冬小麦全生育期内的需水曲线出现两个峰值,即冬前分蘖期的小峰和拔节至成熟的大峰;在拔节至成熟期内,叶水势值基本偏低,生育期内叶水势值的整体变化趋势先降低再升高。[结论]该研究为冬小麦节水灌溉提供了生理基础和理论依据。

[Objective] The purpose was to reflect the water deficit degree by leaf water potential accurately.[Method] The leaf water potential value of winter wheat in the growth stage was determined by PSYPRO water potential system produced by WESCOR Company and the change law of leaf water potential and daily variation regularity in the representative growth stage was analyzed.[Result] The water demand curve of winter wheat in the whole growth stage appeared two peak values,which were the small peak in the tillering stage before winter and the big peak between jointing stage and maturing stage.The leaf water potential was？basically low between jointing stage and maturing stage.The whole change tendency of leaf water potential in the growth stage was decreasing and then increasing.[Conclusion] The research provided physiological and theoretical basis for the water saving irrigation of winter wheat.