晋西北3个树种抗旱性指数的研究

根据对海红、刺槐和柠条的ＰＶ曲线主要水分参数的测定，进行了抗旱性指数季节变化和种间排序分析。结果表明，树种的抗旱性随着年生长发育节律和环境水分条件而改变，其抗早性生长季初最弱，夏季高温干早阶段增强，秋季降雨峰期减弱，生长季末最强或很强。柠条的抗旱性与海红很接近。这对黄土高原地区果树和饲料的开发与水土保持树种的推广有重要意义。

Drought Resistance Index of Three Species of Trees in the Northwestern Shanxi

The seasonal and interspecific changes of drought resistance index were studied in three tree species, Malus micromalus, Robinia pseudoacacia and Caragana korshinskii, based on the data of main water parameters measured by using pressure volume(PV) technique. The result showed that the seasonal change trend of drought resistance in the three species was closely related with both the growth and development stages and the environmental water conditions from May to October, and that the droght resistance in every species was the weakest in May, much stronger in June and July, weak at the autumn rapid growth stage and the strongest or every strong in October. Of these species the drought resistance had following order from strong to weak: M.micromalus,C.korshinskii, R.pseudoacacia. With its strongest drought resistance M.micromalus was a valuable fruit tree species in the triangle area of Shanxi, Shaanxi and Nei Monggol, Because of its great adaptive capacity to water stress C. korshinskii was of great value in both soil and water conservation and fodder production.