摘要
沙冬青 (Ammopiptanthusmongolicus (Maxim) )是沙漠地区及干早荒漠区唯一的天然常绿灌木 ,其独特的生物学特性与适应性对于研究干旱环境条件下植物的适应机制与植物生态系统多样性具有重要意义 .研究结果表明 ,沙冬青在严重干旱环境条件下 ,其光合速率的日变化在上午10 :0 0时左右即达到最大值 ,日平均值仅为 2 .14umol.m- 2 .s- 1,表现出典型的旱生植物光合作用特性 ;其蒸腾速率在一天中也表现为较低水平 ,日平均值为 7.0 3mmol.m- 2 .s- 1.此外 ,沙冬青叶片气孔的调节作用与叶片的光合作用和蒸腾作用都没有表现出密切关系 ,这与植物自身的生理特性有关 。
Ammopiptanthus mongolicus (Maxim) is the only one of evegreen shrubs in desert region. Its biological feature and adaptation are important for studying the mechanism and diversity of desert plants. The result showed that the maximum of photosynthetic rate in leaves of A.mongolicus exited at about ten o'clock during the daily change and the average was 2.14umol.m -2 .s -1 under drought condition. At the same time, the transpiration rate in leaves of A. mongolicus was very low and the average was 7.03 mmol.m -2 .s -1 . The regulation of leaf stomata was related to both the physiological characteristics and environmental condition.
出处
《中央民族大学学报（自然科学版）》
2001年第1期38-41,共4页
Journal of Minzu University of China(Natural Sciences Edition)
基金
国家自然科学基金项目!( 4 98710 0 3)
中国科学院沙坡头沙漠科学试验站第4期开放基金项目!( 2 0 0 0 0 8)资助
