三种灌木耐旱性研究

A Study on the Drought Resistance of Three Shrub Spieces

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。

The drought resistance of Amorpha fruticosa L., Hippophae rhamnoides L. and Caragana microphylla Lam. in pots was investigated in three levels of soil water content. The growth indexes and the productivities of drought resistance (PDR) were measured. The effect of water stress on transpiration daily course and leaf water conservation ability was tested. The effect of water stress on osmoregulation and water content of the seedlings was obtained using Press Chamber and PV techniques.The results showed that C. microphylla had the strongest ability of drought resistance. Its capability of PDR, transpiration, water conservation and osomregulation was highest. The drought resistances of both H. rkamnoides and A. fruticosa were nearly the same. H. rhamnoides had a stronger capability of transpiration and water conservation regulation than that of A. fruticosa, but its osmoregulation ability was weaker than that of A. fruticosa. The PDR of them were similar to each other.