中国现代浙江省动态变化及其发展趋势

用遥感，地图和野外考察研究等方法，首次揭示了我国现代沙漠动态变化规律和发展趋势，认为我国现代沙漠动态变化的总趋势是向草原化和绿洲化方向缓慢发展，其变化速度为４４５ｋｍ＾２／ａ，我国现代沙漠还在继续蔓延，但其扩大速度比较缓慢，约为３１０ｋｍ＾２／ａ。

THE DYNAMIC CHANGES AND TRENDS OF MODERN DESERT IN CHINA

In the paper,based on remote sensing, map and field investigation,the paper discussed the dynamic change and development trends of modern deserts in China. The Change regularities of modern deserts are the following aspects:①the deserts in China evolve slowly and its annual rate is 0.2%,i.e,there is 1618 km² desert to invert,activate,enlarge and shrink every year;②the deserts in China invert significantly and its rate reaches to 1060 km²/a;③the deserts in China activate apparently and its rate is 610 km²/a;④the deserts in China enlarge unsignificantly and its rate is 310 km²/a;⑤It is rare to shrink and its rate is only 10 km²/a;⑥the total development trends of modern deserts in China are to evolve to become grassland and oasis slowly,its rate is 445 km²/a.
The main reason of modern changes is the artificial action. Because the people harness and transform the deserts,the modern deserts invert and evolve to become grassland and oasis gradually.But overgrazing and overfelling cause to activate and enlarge some deserts.