用露点法和湿度法测定叶片水势及其组分

本文讨论了样品水势差异对叶室平衡时间和热电偶冷却时间的影响；比较了湿度法和露点法的测定结果，活体测定与离体测定的结果以及两种渗透势测定方法的结果；并用离体法测定了大麦在NaCl胁迫下叶片Yw，Ys和Yp 的动态变化；用活体法测定了小麦和蚕豆在大田条件下叶片Yw、Ys和YP 的昼夜变化。

Measurement of Water Potential and Its Component in Leaves with Dew Point and Psychrometric Methods

This paper discussed the effects of different water potential on the equilibrium time of leaf chamber and cooling time of thermocouple. The results measured by dew point and psychrometric methods, by in vitro and in situ, and by two kinds of measurement techniques of osmotic potential were compared. Also the in vitro changes of Yw，Ys and Yp in leaves of barley under NaCI stress was measured, and the in situ day and night changes of Yw，Ys and Yp in the leaves of wheat and bean under field condition were estimated.