甘肃近代史上的几次特大旱灾及严重影响赵艳林甘肃是全国降水量稀少的省份之一。年平均降水量３５～９００毫米，至解放前森林覆盖率还不到３％。甘肃河西的北部、西部属干旱区，包括武威、张掖、酒泉三地区。这些地区年平均气温５℃～８℃、年降水量在５０～２００毫米之... Several Severe Drought and Severe Impact in Modern History of Gansu Province Zhao Yanlin Gansu is one of the provinces with scarce precipitation in the country. The average annual rainfall 35 ~ 900 mm, before the liberation of forest coverage is less than 3%. The north of Gansu Hexi, the western part of arid areas, including Wuwei, Zhangye, Jiuquan three areas. The annual average temperature of these areas is 5 ℃ ~ 8 ℃, the annual precipitation is 50 ~ 200 mm ...