Abstract: Based on the condition controlling in the green house, the effect of drought stress on the characteristics of transpiration water consumption of 4 plants were tested.The results showed that 4 species examined had clearly daily variation in transpiration and stomatal resistance.The transpiration rate drop gradually and stomatal resistance increased under the condition of drought stress.When water potential dropped to some critical level, stomatal increased sharply and the transpiration rate decreased to lowest level as stomatal close.Neyraudia reynaudiana was of high drought tolerance with high water use efficiency under different water supply, while Miscanthus floridulus is of low, and the drought resistance ability of Paspalum notatum and Vetiveria zizanioides were ranked between the two species.

Key words: Neyraudia reynaudiana, water stress, transpiration rate, stomatal resistance

摘要： 在温室条件下研究类芦等4种植物在干旱胁迫下的蒸腾特性。结果表明,在正常供水情况下,4种植物蒸腾速率和气孔阻力日变化规律明显;在干旱胁迫下,气孔阻力增大,蒸腾速率逐步降低,当水势下降到临界值时,气孔关闭,气孔阻力急剧增大,蒸腾速率降至最低。4种植物中,类芦的水分利用效率最高,其次为百喜草和香根草,五节芒最低。4种植物的抗旱力以类芦最强,百喜草和香根草其次,五节芒最弱。

关键词: 类芦, 干旱胁迫, 蒸腾速率, 气孔阻力