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水分胁迫对梭梭叶片气体交换特征的影响

Effects of Water Stress on Gas Exchange Characteristics of Haloxylon Ammodendron Leafs

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【作者】 江天然张立新毕玉蓉贾小红冯金朝陶玲刘新民

【Author】 Jiang Tianran 1, Zhang Lixin 1, Bi Yurong 2, Jia Xiaohong 1, Feng Jinchao 2, Tao Ling 1, Liu Xinmin 1 (1.Cold and Arid Region Environment and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, China; 2.School of L

【机构】 中国科学院寒区旱区环境与工程研究所兰州大学生命科学学院中央民族大学生理生化系中国科学院寒区旱区环境与工程研究所 甘肃兰州730000甘肃兰州730000甘肃兰州730000

【摘要】 对梭梭叶片在自然水分胁迫下的气体交换特征进行了研究 .结果表明 ,梭梭在旱季与雨季时的光合作用日变化曲线均呈双峰型 ,具有光合午休现象 ,在旱季 ,植物气孔开度减小 ,从而减少了水分的散失 ,而严重的水分胁迫引起叶肉细胞光合活性的降低 .根据 Farquhar和 Sharkey提出的关于区分光合作用的气孔限制与非气孔限制的两个标准 ,在水分亏缺较严重的旱季 ,光合午休主要是由非气孔因素引起的 ;而在雨季 ,光合午休主要是由气孔因素导致的 .通过光合午休、梭梭叶片 1天中的气体交换主要发生在上、下午光合较高而蒸腾较低的那部分时间里 ,从而使水分利用效率比较高 ,这是梭梭对干旱生境的一种适应方式 .

【Abstract】 The photosynthetic characteristics of Haloxylon ammodendron under natural water stress was studied. The results showed that the net photosynthetic rate displayed a two-peaked diurnal curve in both the dry season and the wet season. The stomatal conductance in the dry season was lower than that in the wet season. The plant diminished the loss of water by decreasing stomatal conductance. Under severe water stress, the photosynthesis activity of mesophyll cells was decreased. According to the two criteria discriminating the stomatal limitation of photosynthesis suggested by Fuqua and Sharkey, the midday depression of photosynthesis in the dry season was predominantly due to the photosynthetic capacity of mesophyll cells. In the wet season, it was predominantly due to stomatal limitation. Midday depression is an important adaptive strategy for Haloxylon ammodendron leafs to avoid water loss under the desert environment.

【基金】 国家九五攻关 (96 - 0 17- 0 1- 0 1) ;中国科学院“百人计划”项目;中国科学院沙坡头实验研究站基金(970 7)资助项目
  • 【文献出处】 兰州大学学报 ,Journal of Lanzhou University , 编辑部邮箱 ,2001年06期
  • 【分类号】Q945.78
  • 【被引频次】106
  • 【下载频次】452
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