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在高温与盐胁迫下，红萍体内电解质发生外渗，并随着红萍组织受伤害程度的增强而加剧。在４５℃高温胁迫下，电导值Ｂ与茎尖死亡率呈显著直线相关。比较了不同萍种在同一逆境下的茎尖死亡率与电解质相对渗出量Ｌ（％），认为Ｌ值的大小能客观地反映萍种的抗热性。在盐胁迫下，红萍Ｌ值随盐浓度的升高而升高，其大小与萍种的耐盐性表现一致。在３９℃高温胁迫下，红萍体内游离脯氨酸无显著累积，比常温提高１０℃的情况下，体内脯氨酸含量无规律性差异，但在４５℃的高温胁迫下，游离脯氨酸却随胁迫时间的延长而呈下降趋势。在盐胁迫下，脯氨酸含量随着盐浓度升高而迅速累积，累积速度越快的萍种，对盐浓度的耐受性就越差。
Under the condition of high temperature and salt stress, Electrolyte extravasation occurred in the body electrolyte and aggravated with the increase of the injury degree of the red duckweed. At 45 ℃ under high temperature stress, the conductance B was significantly and linearly related to the mortality of the shoots. Comparing the different stems mortality and electrolyte relative exudation L (%) of different species in the same adversity, the value of L value can reflect the heat resistance of Ping species objectively. Under salt stress, L value increased with increasing salt concentration, and its size was consistent with that of salt tolerance. Under the condition of high temperature stress of 39 ℃, there was no significant accumulation of free proline in the body of Rhodiola rosea, but there was no regularity of proline content in the body under the condition of 45 ℃, But with the extension of stress time showed a downward trend. Under salt stress, the content of proline rapidly accumulates with increasing salt concentration, and the higher the accumulation rate, the poorer salt tolerance.