面向对象的连云港海岸带土地利用变化及驱动力分析

Land use change and object-oriented driving force of Lianyungang coastal zone

以连云港海岸带为研究区,基于1978年和2010年两期Landsat影像,提取土地利用信息,分析土地利用特征及其动态变化过程;面向土地利用变化基本单元,进行土地利用变化驱动力分析。结果表明:研究期初,该地区的主要土地类型为耕地和盐田,共占研究区面积的67.14%;32 a间共有37.17%的土地发生了变化,盐田和耕地面积快速减少,水产养殖区和工矿企业用地快速增加,有限的林地资源在减少,滩涂围垦达面积46.55 km2,土地利用程度加深;变化的土地中,38.95%由经济结构调整驱动,发展潜力大;27.75%由政策驱动,存在诸多的社会和生态问题;20.49%由政策或者经济结构调整与生产力水平共同驱动,取得较好经济和社会效益;12.81%的土地由政策、人口及经济发展共同驱动。连云港海岸带土地利用存在诸多不足之处,也具有巨大的发展空间。本研究对连云港市提高土地利用的社会效益和生态效益具有重要意义。

The land use characteristic and dynamic change process were analyzed based on twice landsat images of Lianyungang coastal zone in 1978 and 2010, then the land use change driving forces were analyzed orienting minimum land use unit. The result showed that： 1） during the beginning of the study period, cultivated land and salt-pan were main types of land use, accounting for 67.14%of total land area together;2） 37.17%of the land had been changed during past 32 years. Salt-pan and cultivated land decreased rapidly, while the aquaculture land and mine and enterprise land increased rapidly. At the same time, limit forestry land decreased and tidal flat reclamation reached to 46.55 km2, so the land use degree had been deepened;3） 38.95%of land use change was driven by eco-nomic restructuring and had large development potential;27.75%of land use change was driven by policy that had caused many social and ecological problems;20.49%of land use change was driven by combined productivity level with policy or economic restructuring that had produced better economic and social benefit;12.81%of land change was driven by policy, population and economy jointly. So, there were many defects and big development space for Lianyungang coastal zone land use. This study is important for improving the land use social and ecological bene-fits of Lianyungang city.