基于GIS和洛伦兹曲线的辽宁省海岛空间分布特征探析

摘要

In order to reasonably develop,utilize and protect islands' resources in Liaoning Province and optimize the industry structures and arrangements on islands,the spatial distribution characteristics of islands in Liaoning Province were investigated by application of GIS spatial analysis,Lorenz Curve and Gini Coefficient calculation based on the statistical data of 633 islands'coordinates and land areas,which have been listed in the Standard Directory of Islands in China Sea.The results show that the distribution type of islands in Liaoning Province belongs to aggregated distribution and presents group and zonal distribution in space.The islands of Liaoning Province have shaped Changshan Island aggregation district in the northern of the Yellow Sea and shallow sea aggregation zones in the southern of Liaoning Peninsula and in the western of Liaodong Gulf in terms of the levels of aggregation.Approximately 600％ islands locate within the range of 10 km off the mainland coastline in straight line,leading to near the land at high degree.The land areas are imbalance among islands with the Gini Coefficient of 0.9.%为合理开发利用和保护辽宁海岛资源,优化海岛产业结构和布局,以辽宁纳入中国海域海岛标准名录的633个海岛为研究对象,在对其地理坐标、陆域面积等基础数据进行数理统计的基础上,通过GIS的空间分析和绘制洛伦兹曲线、计算基尼系数,对辽宁海岛的空间分布特征进行了分析与研究.结果表明:辽宁海岛属集聚型分布类型,在空间上呈组团与带状分布,按聚集程度来看,形成了黄海北部长山群岛集聚区、辽东半岛南部浅海集聚带与辽东湾西部浅海集聚带三个区域;约60％的海岛处在离大陆岸线直线距离在10 km以内的范围内,近陆程度高;海岛陆域面积分布不均衡,基尼系数达0.9.