In dry area or half dry area,water is one of the main factors for afforesting the highway.It can be solved by designing in a proper way,planting in suitable seasons,ect.

• 在干旱、半干旱地区公路绿化中水是最主要制约因素，通过合理设计、选择适宜植物生长的时期种植和采用高分子化合物等，从而达到抗旱和防治水毁的目的。