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作 者 ：李吉跃,周平,招礼军

期 刊 ：生态学报 2002年 22卷 9期 页码：1380~1386

关键词：干旱胁迫；水势；蒸腾耗水量；蒸腾耗水特性；

Keywords:drought stress, water potential, water consumption, water consumption characteristic,

摘 要 ：采用 Lico- 6 40 0便携式光合系统测定仪和 BP34 0 0精密天平等仪器研究了 9个北方主要造林树种的蒸腾速率及实际蒸腾耗量 ;用压力室法分阶段测定了苗木的叶水势。得出了苗木在正常水分条件下及干旱胁迫过程中的蒸腾耗水规律。比较分析了不同水势梯度下、昼夜不同时间段的各树种的蒸腾耗水量及蒸腾耗水速率。结果表明 ,蒸腾耗水以白天为主 ,在相同的水分条件下 ,不同的苗木有不同的蒸腾耗水量 ,同种苗木的蒸腾耗水量随干旱胁迫的加重而减少 ,在受到严重干旱胁迫时 ,针叶树油松和侧柏的耗水量均降至正常水分条件下的 11.7% ,阔叶乔木树种降至 6 .6 % ,灌木树种降至16 .9%。通过研究苗木在不同水势梯度下的耗水特性和蒸腾耗水量 ,为在水量缺乏的情况下 ,进行有效的林木培育和植被恢复重建提供依据。

Abstract:Transpiration rates and water consumption of nine main plantation tree species in North China were studied by using Lico 6400 Portable Photosynthesis System and BP3400 Precision Balance etc.. Leaf water potential was measured using pressure chamber in different phase. The water consumption patterns of seedlings were observed in normal water supply and drought stress conditions. The quantity and rate of water consumption were compared and analyzed in different water potentials and in times of day and nigh...

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