坝上地区土地利用及沙化动态原因分析

选择具有典型意义的多伦南部、围场西部、丰宁北部为研究对象,利用1987年、1999年和2004年3期Landsat TM卫星影像,采用监督分类和转移矩阵,对该地区土地利用及土地沙化的变化进行了研究。结果表明,生态环境具有恶化和逆转双重性,积极的生态建设能有效遏制生态环境的恶化。1987—1999年该区域生态环境持续恶化,沙化土地扩展,1999年在以生态建设为中心的京津风沙源治理工程实施后,生态环境恶化的趋势得到显著遏制。

Analysis on Dynamic Changes of Land Use and Desertification in Bashang Area

In Bashang,an area with very fragile eco-environment in north China,three typical sub-areas,south of Duolun,west of Weichang and north of Fengning,were selected.Using Landsat TM satellite images of 1987,1999 and 2004,supervised classification and transfer matrix were applied to study the dynamic changes of land use and soil desertification in this area.The results show that eco-environment has dual nature-deterioration and reversion,and active ecological construction can effectively deter the deterioration of eco-environment.From 1987 to 1999,eco-environment continued to deteriorate and soil desertification was extended.Since the Project of Jing-Jin Sand-Storm Source Control,which was centered on ecological construction,carried out in 1999,the trend of eco-environment deterioration has been inhibited significantly.