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根据ＰＶ曲线主要水分参数测定数据，进行了黄土区６ 个乔、灌木树种抗旱性季节变化趋势和树种间抗旱性指数排序分析。结果表明，树种抗旱性指数在生长季（５～１０ 月）呈具有阶段降低的持续增大趋势，仅在雨季中后期（ 即树木年第２生长高峰期）略有减小。在年生长季土壤严重干旱阶段，树种的抗旱性指数大小排序为： 海红＞ 河北杨＞ 柠条＞ 小叶杨＞ 北京杨＞ 刺槐
According to the measured data of the main moisture parameters of PV curve, the seasonal variation trend of drought resistance and the drought resistance index of six species of shrub and shrub in loess area were analyzed. The results showed that the drought resistance index of the tree species tended to increase steadily during the growing season (May-October), and only slightly decreased in the middle and late stages of the rainy season (ie the second peak growth season of trees). In the severe drought stage of annual growing season, the order of drought resistance index of tree species is as follows: sea red> Hebei> Caragana> Populus> Populus> Robinia pseudoacacia