在黄土高原半干旱、干旱地区营造水土保持林,需要选择耐旱的树种。为了给这些地区的树种选择提供科学依据,我们对一些当地乡土树种及由外地沙区引进的乔灌木树种,进行了抗旱生理指标的测定,现将初步结果报导如下。研究的树种及方法一、研究树种我们重点测定耐旱的灌木,尤其对过去缺少研究的蒙古莸花、木地肤等新种更加注意. In the semi-arid and arid areas of the Loess Plateau to create water and soil conservation forests, need to choose drought-tolerant species. In order to provide a scientific basis for tree species selection in these areas, we conducted some physiological indicators of drought resistance for some native tree species and the shrub and shrub species introduced from the outer sandy areas. The preliminary results are reported as follows. Species and Methods of Study I. Tree Species We focus on the determination of drought-tolerant shrubs, and pay more attention to new species such as mulberry flowers and wood husks, which were not studied in the past.