The climax development group is isohumosols after sandy soil fixed under vegetation recovery condition in research regions . there was no different in soil type after 40 years developed . this manifested that soil formation and development process is very slow in high frigid regions 6 、研究区土壤在植被恢复条件下，风沙土被固定以后，经过40多年的发育，类型未发生明显分化，表明在高寒地区土壤的形成发育过程相当缓慢，土地一旦发生荒漠化，恢复治理相当困难，所以荒漠化防治要以预防为主。
