中国农业气象

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黄土高原土壤干旱及其敏感阶段特征

龚建福,王毅荣,张存杰   

  1. 中国气象局兰州干旱气象研究所/甘肃省干旱气候变化与减灾重点实验室,甘肃省定西市气象局 ,中国气象局兰州干旱气象研究所/甘肃省干旱气候变化与减灾重点实验室 兰州730020 ,兰州730020
  • 出版日期:2005-04-10 发布日期:2005-04-10
  • 基金资助:
    科技部社会公益研究专项“中国干旱气象灾害监测预警方法研究”(2 0 0 4DE10 0 5 92 -B)

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

GONG Jian-fu~1, WANG Yi-rong~2, ZHANG Cun-jie~1 (1.Key Laboratory of Arid Climate Change and Reducing Disaster of Gansu Province/Lanzhou Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China; 2.Meteorological Bureau of Dingxi)   

  • Online:2005-04-10 Published:2005-04-10

摘要: 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;年际振荡强弱与土壤干旱变化的阶段相对应

关键词: 黄土高原, 土壤干旱, 敏感阶段, 特征, EOF

Abstract: 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.

Key words: Chinese Loess plateau, Chinese Loess plateau, Soil arid, Sensitivity phase, Characteristics, EOF