基于GIS的天津市滨海新区湿地演变分析

Evolution of Wetland in TBNA and Analysis of Driving Forces Based on GIS

以1984年、1995年、2008年遥感影像和2004年滨海新区土地利用现状图为主要数据源,配合其它历史数据,在遥感与地理信息系统技术支持下,对天津市滨海新区1984-2008年期间景观格局及其动态变化进行分析。结果表明在研究期内滨海新区湿地面积整体呈下降趋势,湿地面积占总面积比例由1984年的48.16%降低到2008年的31.86%,其中以2004-2008年湿地减少速度最快,5年内湿地面积减少14.70%,占土地总面积13.4%的湿地转出变为建设用地。这其中的变化有湿地向其他用地类型转出、其他用地类型向湿地的转入,也有湿地内部盐田、水域和未利用地之间的相互转换。湿地与其他土地利用类型相互转换中以湿地转出变为建设用地为主要变化方式。

Taking the landsat TM images in 1984, 1995 and 2008, and the present land use map of 2004, and the other data of Tianjin Binhai New Area （TBNA） as the basic information resources, this paper analyzed the landscape changes of TBNA wetlands in 1984-2008 by RS and GIS. The result showed the area of wetland was continuously declining in the study period especially during 2004 to 2008. The wetland accounted for 48.16% in 1984, which dropped to 31.86% in 2008, and the wetland area decreased 14.70% from 2004 to 2008. About 13.4% of TBNA total land area was transferred out of wetland into construction land. The transferring included from wetland to other lands, from other lands to wetland, and the changing within wetland. And the conversion from wetland to construction land was the main component of land use change.