毛乌素沙地土地利用动态变化分析

利用毛乌素沙地2000、2005、2007、2010年的TM卫星遥感影像数据,对毛乌素沙地近10年的土地利用动态变化进行了分析并得出以下结论:⑴在时间尺度上,2000-2010年毛乌素沙地裸露地、低覆盖草地和耕地面积减少,高、中覆盖草地、林地和居民工矿用地面积增加,水域无明显变化。⑵在空间上尺度上,2000-2010年,毛乌素沙地北部地区土地利用变化较明显,其中在东北部,大部分由耕地转为林地,在西北部,部分中覆盖度草地转为耕地。⑶2000-2005年,研究区土地利用类型中面积增加最多的是中覆盖度草地,净增加7 598.84 hm2,主要由26 255.3 hm2的低覆盖度草地和3 550.41 hm2的裸露地转入;2005-2007年,研究区土地利用类型中面积增加最多的是高覆盖度草地,净增加7 584.81 hm2,主要由6 074.43 hm2的裸露地和3 083.12 hm2的中覆盖度草地转入;2007-2010年,研究区土地利用类型中面积增加最多的是林地,净增加37 978.01 hm2,主要由35 488.96 hm2的耕地和2 640.42 hm2的高覆盖度草地转入。

Analysis on Dynamic Change of Land Use in Maowusu Sandy Land

The dynamic change of land use in Maowusu Sandy Land in recent 10 years has been analyzed by using TM satellite remote sensing image data of 2000,2005,2007 and 2010. ⑴ The obvious change features of land use in Maowusu Sandy Land is that an increase in forest land,high coverage grassland,medium coverage grassland and residential and industrial land,a reduction in cultivated land and bare land and low coverage grassland,and there is no significant change in water from 2000 to 2010. ⑵ Land use change is more obvious in northern part of Maowusu Sandy Land. In the Northeast,the great majority of cultivated land changed into forest land,and in the northwest,parts of the medium coverage grassland changed into cultivated land. ⑶The area of medium coverage grassland has increased（ net increase of 7 598. 84 hm2） the most among all the land use types,transferred mainly by 26 255. 3 hm2low coverage grassland and 3 550. 41 hm2bare land from 2000- 2005; The area of high coverage grassland has increased（ net increase of 7 584. 81 hm2） the most among all the land use types,transferred mainly by 3 083. 12 hm2medium coverage grassland and 6 074. 43 hm2bare land from 2007- 2010.