恩格贝沙地环境中沙柳生理动态变化的初步研究

沙柳是恩格贝旅游区沙地中固定沙丘和流动沙丘的重要固沙植物。沙柳叶片光合速率呈现出不规则的日动态变化,在11:00~14:00出现光合午休现象。蒸腾速率呈现出单峰型的日动态变化,蒸腾在午后13:00达到最大值。沙柳在春末的光合速率、蒸腾速率分别是夏末的79.38%和71.56%,表明水分亏缺是影响沙柳生长发育的主要限制因素。

Physiological Dynamic Change of Salix psammophila C. Wang et Ch. Y. Yang in Engebei Sandy Land

Salix psammophila C.Wang et Ch.Y.Yang is an important kind of sand binding plant in fixing and moving sandy dune in Engebei Sandy Land.The leaf photosynthetic rate of Salix psammophila C.Wang et Ch.Y.Yang appears irregular diurnal dynamic change.Photosynthetic midday rest appears at 11:00 ~14:00.The transpiration rate shows unimodal diurnal dynamic change and reaches the maximum value at 13:00.The photosynthetic rate and transpiration rate at the end of Spring are 79.38% and 71.56% of those at the end of Summer separately,which shows that water deficit is the main restricting factor to affect the growth and development of Salix psammophila C.Wang et Ch.Y.Yang.