黄土高原土壤干旱及其敏感阶段特征

Study on the Soil Arid and Its Sensitivity Phase Over Chinese Loess Plateau

利用逐月实测降水资料,结合土壤干旱指数模型、小波分析技术等,研究了黄土高原土壤干旱近4 0年的变化,结果表明:土壤干旱在黄土高原的不同地域程度不同,步调不一;最严重土壤干旱出现在7- 10月份;小波分析还表明存在以2 - 4年为主的年际振荡,干旱从高原敏感区向四周传播;

By investigating distributing of soil arid over Chinese plateau during recent 40 years. Results showed that there had been the whole and regional distributing in the evolvement of arid over Chinese plateau in 480 months and from July to October. By using wavelet analysis,2 years and 4 years variation period change was identified remarkably. Also the arid had changes amplitude and period,flowed from the sensitivity regions to around in Chinese loess plateau.