中国北方沙质荒漠化土地动态变化遥感分析

采用1975年MSS卫星图像、2000年ETM卫星图像为遥感信息源,结合地理信息系统方法,通过建立科学的沙质荒漠化土地类型和动态变化类型分类系统,对我国北方地区近25年来的沙质荒漠化土地进行了动态变化分析.结果表明:沙质荒漠化土地呈明显的发展状态,其面积明显增加,强度明显增大.其面积增加了7 369.71km 2,平均每年增加294.79km 2,发展区面积90 663.90km 2,稳定区面积140 167.06 km 2,逆转区面积69 147.33km 2,发展区的面积比逆转区的面积大21 516.57km 2.总体呈现"整体发展,局部逆转"和"面上破坏,点上治理"的变化特点.

Remote Sensing Analysis on Dynamic Change of Sandy Desertification Land in North China

Using MSS satellite image data in 1975 and ETM image data in 2000 as remote sensing information source, dynamic changes of sandy desertification in North China in the recent 25 years, are analyzed by establishing a scientific system to classify the types of sandy desertification land and dynamic changes. The results show that the sandy desertification is still expanding and the sandy desertification area and intensity are increasing. The area of sandy desertification land increased 7 369. 71 km^2, averagely 294. 79 km^2 per year. The developing area is 90 663. 90 km^2, steady area is 140 167.06 km^2 and the reverse area is 69 147. 33km^2. The developing area is 21 516. 57km^2 larger than the reverse area. Generally speaking, it is of pcharacteristics of holistically developing, partially reversing, holistically destroyed and partially controlled.