不同环境因子对西洋参蒸腾特性的影响研究

试验研究不同环境因子对西洋参叶片蒸腾特性的影响结果表明 ,环境温度与湿度变化明显影响西洋参叶片蒸腾速率和气孔导度的变化。西洋参植株生长势与叶片蒸腾速率、气孔导度的变化关系密切 ,健壮西洋参植株叶片蒸腾速率与气孔导度及叶片气孔开张度对逆境的适应性和自调控能力均高于纤弱植株。晴天参棚 17.5 %、2 5 .8%和 35 .4 % 3种透光率下西洋参叶片蒸腾速率的日变化不同 ,表现为午前高峰型、午间高峰型和双峰型 ;夏季强光高温条件下气孔导度和气温是影响西洋参叶片蒸腾速率变化的最主要因子。

The effect of environmental factors on American ginseng's transpiration under different conditions

Experiments of American ginseng's transpiration under different environmental conditions were carried out from 1997 to 1998 at Jinzhai County, Anhui Province. The results show that the American ginseng's transpiration rate and stomatal conductance are affected obviously by the change of environmental temperature and humidity. American ginseng's plant growth has good relationships with the daily changes of the transpiration rate and stomatal conductance. The transpiration rate and stomatal conductance of healthy plants are higher than those of weak plants, and also their stomatal self-controlling abilities are better than those of weak ones. At a sunny day, under 17.5%,25.8%,and 35.4% of the shed's light transmission rate, the daily changing patterns of American ginseng's transpiration rate are different, the maximum value of transpiration rate respectively appears at different times, they were "before noon","at noon "and "after noon". The main factors which influenced American ginseng's transpiration rate are stomatal conductance and air tempe- rature .