作　　者： ; ; ; ;

机构地区： 兰州大学资源环境学院

出　　处： 《中国沙漠》 2003年第1期95-100,共6页

摘　　要： 根据古城废弃、湖泊退缩、频降尘期等发生时代的相对一致性,确定历史时期河西走廊沙漠化过程存在3次大发展时期,即南北朝、唐末五代和明清两朝,它们均对应近2ka来的气候干冷阶段。清代中期河西走廊人口密度突破了干旱地带人口压力的"临界指标",水资源利用率超过40%,是晚近沙漠化土地迅速扩大的主要原因。 During the recent 2000 years, about 45 ancient cities were abandoned from desertification in Hexi Corridor. Among them, 22\^2% were abandoned during South and North Dynasties, 24\^4% during the end of Tang and the Five Dynasties, and 53\^3% during Ming and Qing Dynasties. At the same time, main lakes were shrinking rapidly during the 5th～6th century and the end of Qing Dynasty. The climate in these periods was relatively arid and cold when frequent dusts happened. The phases of these changes indicated synthetically that there were three periods of desertification enlarged rapidly in North China. They were South and North Dynasties,the end of Tang Dynasty and Five Dynasties, the Ming and Qing Dynasties. The macro\|process of desertification in the studying region was controlled mainly by the climatic changes. But from the facts of the density of population in the middle of Qing Dynasty had exceeded the critical index of population pressure in arid land and the rate of the utilization of water resource had exceeded 40% in Hexi Corridor, this paper also suggests that the human activities have played an important role in desertification processes of the study area mainly during the recent 300 years.

关 键 词： 河西走廊 沙漠化过程 气候干冷 人类活动 清代 湖泊 人口密度

领　　域： [天文地球]