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为确定对干旱胁迫的生理反应、为定量分析水分胁迫程度以及作为灌溉计划的参考,常常需要测定叶水势。使用最广泛的测定方法是湿度计和压力室法,但在大田研究中均有弊病。湿度计测定常常需要精确的温度控制或测定,需要使用微伏特计,通常还需要较长的平衡时间(Turner,1981)。压力室(PC)法是估测叶水势的可靠方法(Ritchie等,1975)。但它
In order to determine the physiological response to drought stress, it is often necessary to determine leaf water potential in order to quantify the extent of water stress and as a reference for irrigation programs. The most widely used method of measurement is the hygrometer and the pressure chamber method, but there are disadvantages in field research. Hygrometer assays often require precise temperature control or measurement, the use of a microvoltmeter, and often a longer equilibration time (Turner, 1981). The pressure chamber (PC) method is a reliable method of estimating leaf water potential (Ritchie et al., 1975). but it