蕉城区城乡建设用地景观格局变化研究

Research of urban and rural built-up land change based on landscape patterns in Jiaocheng area

以福建省宁德市蕉城区2010年土地利用现状图和2020的土地利用规划图作为基础数据,提取了该区各个行政区的城乡建设用地信息。运用景观格局分析理论,选取五种景观指数,其中采用了一个新型的景观扩张指数,用以表征城乡建设用地动态变化过程。结果表明,蕉城区在规划期间城乡建设用地将大量扩张,面积将增加71.4%;其中面积增加最多的是潭湾镇,达到1157.45 hm2;而该地区城乡建设用地分形维数从2010年的1.349变为2020年的1.319,稳定性指数从0.153增加到0.1822;这就说明该地区在人为规划因素影响下,其斑块变得越来越规则,结构也趋于稳定,其中以七都镇最为突出,稳定性指数增加77.0%,达到0.223;另外通过计算景观扩张指数,得出该区86%的扩张斑块为邻接式扩张,14%的扩张斑块为外部式扩张,比较突出的是飞鸾镇和三都镇,它们外部式扩张的斑块数超过10个。

On the basis of land-use map and land-use plans, we extract the urban and rural built-up land information of each administrative region in Jiaocheng of Fujian Province. Then we select five landscape indices, which are used to describe the dynamic process of built-up land during the 2010-2020. The result show that built-up land will increase by 71.4 % during that period. And the town of Tanwan increases 1157.45 ha in built-up land. In the Jiaocheng area, the fractal dimension changes from 1.349 to 1.319, while the stability index increases from 0.153 to 0.182. The most prominent town is Qidu whose stability index increases 77.0% and changes to 0.223 in 2020. Because of the influence of human planning, the patches become more and more regular and the structure is also stabilized. What＇s more, the result of landscape expansion index shows the mainly expansion pattern of patches is adjacent expanding pattern. And only 14 percent of patches is external expansion pattern. The number of Feiluan and Sandu town＇s external expansion pattern patches is more than 10.