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用盆栽法设置三种土壤相对含水量,研究紫穗槐、沙棘、柠条的耐旱能力。测定了生长指标,计算出耐旱生产力;研究了水分胁迫对蒸腾日进程和叶保水力的影响;用压力室和PV技术测定并计算了水分胁迫对苗木渗透调节能力和水分状况等影响。综合上述三类指标,得出柠条的耐旱性最强,其耐旱生产力,蒸腾、保水力和渗透调节能力最高。沙棘和紫穗槐的耐旱性接近,沙棘的蒸腾和保水力的调节能力大于紫穗槐,但渗透调节能力却低于紫穗槐,它们的耐旱生产力很接近。
Potting method was used to set the relative water content of the three soils to study the drought tolerance of Amorpha fruticosa, Seabuckthorn and Caragana korshinskii. The growth index was calculated and the drought-resistant productivity was calculated. The effect of water stress on transpiration day and leaf water retention was studied. The effects of water stress on seedling osmotic adjustment and water status were measured and calculated by pressure chamber and PV technique. Based on the above three indexes, it is concluded that Caragana korshinskii has the strongest drought tolerance and highest drought-tolerant productivity, transpiration, water retention and osmotic adjustment. The seabuckthorn and Amorpha fruticosa have similar drought tolerance, and the transpiration and water holding capacity of seabuckthorn are greater than that of Amorpha fruticosa, but their osmotic adjustment ability is lower than that of Amorpha fruticosa and their drought tolerance productivity is very close.