基于GIS／RS的鄱阳湖区土地利用变化及空间分异特征研究

Land use change and spatial distribution characteristics based on RS and GIS in Poyang Lake area

基于GIS和RS技术,分析了鄱阳湖区1989年～2000年土地利用变化及其空间分异特征.研究表明,11年间湖区林地、草地和城镇建设用地呈增加趋势,湿地和未利用地呈减少趋势,而农业用地和水体基本保持不变.其中湿地面积的减少和城镇建设用地的增加十分显著.进一步分析了土地利用转移的流向,结果表明,主要转移方向包括湿地转移为林地和农业用地;农业用地的主要流向类型为草地和城镇建筑用地.各类土地利用变化在空间上呈现明显的区域分异,湿地与城镇用地的强烈变化尤为明显.湖区人口的急剧增长、经济的迅速发展以及国家政策的调整是鄱阳湖区土地利用变化的主要驱动因子.

The changes and spatial distribution of land use from 1989 to 2000 in Poyang Lake area are examined by using remote sensed imageries and GIS data. It is illustrated that over the 11 years the area of forest, grassland and built up increased, the wetland and unused land decreased, and the agriculture land and water body did not change much. The changing trends are dominated by the decrease of wetland and the increase of built up land. The main conversion types include the wetland converting to forest and agriculture land,and agriculture land converting to grassland and built up. Each type of land use change has a dramatic spatial distribution. Population explosion, economic development and the government policies are identified as the main factors of land use change in the study area.