我国北方多沙粗沙区常见树种水分利用效率的研究

Water use efficiency of common tree species in the excessive and thick sandland regions of Northern China

采用Li-6400光合作用系统测定北方多沙粗沙区不同光强条件下常见树种水分利用效率和蒸腾效率结果表明,6个树种水分利用效率依次为刺槐>山楂>杨树>柳树>榆树>核桃,2种灌木沙柳水分利用效率高于柠条,但其蒸腾速率却小于柠条,在半旱区水分竞争力强于柠条。

The water use efficiency and transpiration rate of common tree species under different radiations were measured by using Li-6400 potable photosynthetic system in the excessive and thick sandland regions of Northern China. The results show that the order of the water use efficiency of 6 tree species is acacia 〉 haw 〉 poplar 〉 osier 〉 elm 〉 walnut, and also show that the water use efficiency of S. psammophila is greater than that of C. intermedia, but its transpiration efficiency is far less than that of C. intermedia and the drought-resistant ability of S. psammophila is stronger than that of C. intermedia.