关键词: 土地荒漠化, 发展动态, 自然因素, 人为因素, 张掖市

Abstract: The area of land desertification had increased one time from the foundation of People's Republic of China to 1993, and had increased (59 265) hm² from 1999 to 1993. There are two reasons that caused land desertification: the nature factors and the artificial factors. The nature factors were objective and were very difficult to change in a short time; the artificial factors, such as population explosion, unreasonable human activity and policy default etc., were the most important and direct factors in a certain time and place. So the only way that people can do to delay and prevent the progress of land desertification and recover the vegetation was to recognize the artificial causes that lead land desertification and to change the behavior of human-self.

Key words: land desertification, developmental dynamic, natural factors, artificial factor, Zhangye city