长江三角洲城镇建设用地扩展特征及驱动力研究

Characteristics of and driving forces behind urban construction land in the Yangtze River Delta region

以长江三角洲地区25市为研究对象,运用1990-2015年六期遥感影像资料,结合GIS技术与综合扩展程度等指数从城镇建设用地总量扩展速度、时间扩展特征以及空间扩展差异的角度来分析其扩展特征,并通过多元线性回归分析揭示建设用地扩展的驱动力。结果显示:长江三角洲地区城镇建设用地总量扩展速度较快,25年年均扩展速率达到7.05%,高于全国5.86%的平均水平;从时间上看,长江三角洲地区城镇建设用地扩展呈现"W型"态势;从空间上看,建设用地扩展区域差异明显。处于长江三角洲区域中心的城市扩展相对较快,而处于边缘的城市由于自然因素的限制扩展相对缓慢;驱动力研究结果显示:产业结构高级化指标、总人口、城市居民人均可支配收入、固定资产投资与城镇建设用地面积显著正相关,人均GDP、实际外商直接投资额以及社会消费品零售总额与城镇建设用地面积呈显著负相关。

Using the remote sensing image data from 1990 to 2015 on 25 cities in the Yangtze River Delta region,this paper analyzes the expansion characteristics of the areas,such as the speed of urban construction land expansion,time expansion,and spatial expansion.These are combined with the exponential of GIS technology and the comprehensive expansion degree.Subsequently,the driving force behind the expansion of construction land is analyzed.The results show that the total amount of urban construction land in the Yangtze River Delta is expanding rapidly,with the annual rate of expansion being 7.05%in the last 25 years,which is higher than the national rate of 5.86%.With regard to time,the urban construction land expansion in the Yangtze River Delta shows a“w-type”situation.With regard to space,construction land expansion differs regionally.Expansion at the center is relatively rapid,while it is relatively slow in marginalized cities due to the limitations from natural factors.Research results on the driving force show that the industrial structure of the advanced indicators,the total population,the per capita disposable income of urban residents,and the investment in fixed assets are positively correlated with the urban construction land area.Per capita gross domestic product,actual foreign direct investment,and total retail sales of social consumer goods are negatively correlated with urban construction land area.