环渤海地区城镇化进程中耕地面积及其重心转移格局分析

Analysis of Spatial Pattern on Farmland Area Change and the Gravity Center Transfer under urbanization of Bohai Rim

基于环渤海地区1985年和2008年的1：10万土地利用现状矢量图库，在GIS技术与模型方法支持下，定量分析了环渤海地区耕地变化的动态特征。进一步利用重心模型法，计算了研究期内耕地面积重心及其变化。结果表明：1985～2008年，环渤海地区耕地面积减少139．15万hm2，年均减少6．05万hm2；耕地面积重心向东移动0．097°、向北移动0．011°，重心总体向东北移动8．39km；1985—2008年环渤海地区耕地变化不仅表现为面积减少，而且表现耕地质量的下降，快速城镇化对耕地面积及其空间变化的影响日益显现。

Based on Bohai rim＇s 1： 100, 000 land use status vector data and supported by GIS and model meth- od, this paper quantitatively analyzed the dynamic feature of Bohai rim＇s farmland change. Farmland area and the gravity center change during the study period were further calculated by the gravity center model. The results showed that during the period of 1985 to 2008, farmland area of Bohai rim reduced 1 391 500hm2, with an average annual decrease of 60 500hm2. The gravity center of farmland area moved toward east 0. 097 ° and 0.011 °to north, or generally moved 8.39km to northeast. From 1985 to 2008 Bohai rim＇s farmland change was not only area decrease, but also quality decline. The effects of rapid urbanization on the farmland area and spatial change were more and more remarkable.