【摘要】 恭城县喀斯特地貌占全县土地面积60%以上,岩溶石漠化分布广泛,制约了该县经济发展。采用1991、2000和2006年时间序列的卫星遥感影像数据,对该县岩溶石漠化环境变化开展了植被指数NDVI、监督分类和重心轨迹等遥感定量分析。采用4种图像监督分类方法,提取了6种主要的生境信息。1991、2000和2006年NDVI分别为0.176 417、0.068 84和0.336 478,岩溶石漠化面积分别为160.8、234.1和118.0 km2,均说明了恭城县的岩溶生态环境恢复正在朝好的方向发展。研究表明:运用最小距离分类在本试验区对识别6类生境分区比较可行;岩溶石漠化灾害在总体上具有向南东方向偏移的趋势,年均偏移速度约为49 m。更多还原

【Abstract】 In Gongcheng County,the area of karst landforms is over 60%.Karst rocky desertification restricts economic developing of this county.For this reason,quantitative analysis is carried out on normalized difference vegetation index(NDVI),supervised classification and tracks of gravity centre of NDVI,by remote sensing image of the satellite in 1991,2000 and 2006.Four kinds of supervised classification methods are used to extract six kinds of major ecological environment information.In 1991,2000 and 2006,NDVIs are 0.176 417,0.068 84,0.336 478,karst rocky desertification area are 160.8,234.1 and 118.0 km2.These show that karst ecological environment restoration is now heading a better condition in Gongcheng.The use of minimum distance classifier method is available to distinguish subarea from six kinds of major ecological environment.Karst rocky desertification moves toward southeast,with an average annual migration distance of about 49 meters.更多还原