浙江省城镇建设用地空间扩展时空特征分析

运用1990~2015年浙江省6期土地利用数据, 使用扩展速率、扩展强度、分形维数等指标分析浙江省城镇建设用地空间格局. 结果表明 (1)1990~2015年, 浙江省城镇建设用地增长在5个时期呈现“W”趋势, 从不同行政等级来看, 扩展速度的发展趋势具有一致性, 2000~2005年是浙江省不同行政等级的城市城镇用地扩展速度的最快阶段. (2)从扩展强度来看, 浙江省在2000~ 2005年对城镇用地扩展最大, 其他时期基本维持稳定. 地势平缓的城市往往开发强度大, 丘陵地区的城市处于缓慢扩展阶段. (3)浙江省城镇用地空间结构的分形维数和稳定性特征存在波动性. 城镇用地的空间结构特征与城镇用地增长过程和发展阶段具有一定的联系. (4)浙江省城镇用地重心受到地形限制明显. 西南地区受到丘陵地形影响, 重心移动方向大多数与斜长的峡谷平行; 北部平原区域的城镇用地的重心变化往往受到经济等社会因素影响较大. (5)浙江省城镇建设用地空间扩展的影响因素上存在一定规律, 可看出1995年、2010年、2015年主要倾向于社会经济的影响, 在2000年、2005年则倾向于自然因素的影响.

Analysis of spatial and temporal characteristics of spatial expansion of urban construction land in Zhejiang Province

Based on the data of land use in Zhejiang Province from 1990 to 2015, the spatial pattern of urban construction land is analyzed using indicators such as expansion rate, expansion intensity and fractal dimension. The results show that (1) From 1990 to 2015, the growth of urban construction land in showed a “W-shaped” trend throughout the five periods. At different administrative levels, the development trend of expansion speed is consistent. It is in 2000–2005 that the urban land use at different administrative levels of Zhejiang Province has the fastest expansion rate. (2) From the perspective of expansion intensity, Zhejiang Province developed with the greatest intensity of urban land expansion from 2000 to 2005. Other periods have remained basically stable. Cities with flat terrain tend to have large development intensity, and cities in hilly areas are at a slow expansion stage. (3) The fractal dimension and stability characteristics of urban land use spatial structure demonstrate certain volatility. The spatial structure characteristics of urban land suggest a certain relationship with the urban land use growth process and development stage. (4) The center of gravity of urban land is obviously restricted by terrain. The southwestern region is affected by the hilly terrain, and most of the center of gravity moves parallel to the steep canyon. The change in the center of gravity of urban land in the northern plain is often greatly related to the economic factors. (5) There exist certain regularities on the influencing factors of the spatial expansion of urban construction land. It is noticed that in 1995, 2010 and 2015, the factors are prone mainly to social economy, while in 2000 and 2005, they are more related to the influence of natural factors.