浑善达克沙地不同植物功能型光合作用和水分利用特征的比较(英文)

被引:10
作者
牛书丽
蒋高明
高雷鸣
李永庚
姜闯道
刘美珍
崔红霞
丁莉
彭羽
机构
[1] 中国科学院植物研究所植被数量生态学开放研究实验室
关键词
浑善达克沙地; 气体交换; 植物功能型; 气孔调节; 水分利用效率;
D O I
暂无
中图分类号
Q945 [植物生理学];
学科分类号
0903 ;
摘要
为了比较不同植物功能型在沙地生境下光合作用和水分利用效率的差异,测定了浑善达克沙地3种功能型的代表种的气体交换特征来比较它们的光合碳固定能力和水分利用状况。3个代表种的气体交换日变化结果表明乔木的光合速率和水分利用效率比草本和灌木的低,而蒸腾速率和气孔导度较高,经过中午的光合午休后,乔木的光合速率在下午没有恢复,而草本和灌木都有不同程度的恢复。在所测定的所有代表物种中,研究地全部的乔木(3种)和灌木(6种)以及典型的草本(2 5种) ,气孔导度与光合速率和蒸腾速率都成显著的正相关关系;另外,在同样的叶片水势情况下,乔木植物的气孔导度最低,在同样的蒸腾速率情况下,乔木植物的光合速率最低。这些结果表明乔木在CO2 同化和H2 O蒸腾平衡上具有低的水分利用效率。从这个角度考虑,我们认为在对沙地进行恢复时,一些草本和灌木种比乔木更合适
引用
收藏
页码:699 / 704
页数:6
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