正蓝旗荒漠化遥感动态监测研究

摘要

The article takes the two TM image data of the year of1987 and 2000 as the information source,extracts two land desertification data,sets up the databases and gets the land desertification dynamic maps from 1987 to 2000 in Zhenglanqi.it statistics and calculates the conversion area among different degrees of desertification of the area for the past13 years,the land dynamic transfer will be established by the conversion matrix method from 1987 to 2000.The results show that： the desertified land is from 5593.8km2 in 1987 to 6015.3km2 in 2000,the average rate of development 32.4km2 / Years.The land is serious desertification,which mainly exists the mild and moderate,some very severe and severe desertification of land has been improved,but the new more moderate and light desertification land is generated.For 10 to 15 years,there is obvious jump process between the aggravation of desertification and less,mainly happens in the northern plains,the dynamic trend of development is the overall expansion and partial reversal（mainly in the west）.%以1987年和2000年两期TM影像数据为信息源,提取研究区两期荒漠化土地数据,建立数据库,获得正蓝旗1987～2000年土地荒漠化动态图,统计计算该区13年内不同程度荒漠化土地之间的转换面积,采用转移矩阵法建立1987～2000年土地动态转移数据矩阵,结果表明：该区荒漠化土地从1987年的5 593.8 km2发展到2000年的6015.3 km2,发展的平均速率为32.4 km2/年,土地荒漠化严重,以轻度和中度为主,部分极重度和重度荒漠化土地得到了好转,但新的更多的中度和轻度荒漠化土地在发展。在10～15年的时间尺度内,土地荒漠化程度加重与减轻存在明显的跃变递减过程,主要发生在北部平原地区,发展的动态趋势是整体扩展,局部逆转（主要在西部）。