基于建设用地适宜性评价的城市增长边界划定

On Delimitation of Urban Growth Boundary Based on Construction Land Suitability Evaluation

城市增长边界作为一种控制城市蔓延的技术手段和政策工具,成为管控城市空间扩展的首选措施.本文首先基于建设用地适宜性评价确定土地开发建设的空间格局,然后叠加土地利用总体规划确定的允许建设区范围,利用基于CA-Markov土地利用变化模拟预测的建设用地扩展区域,最终确定城市增长边界.研究结果表明:建设用地适宜性高值区位于西南部区域,多集中在新城建设区内.低值区分布在生态、水源敏感性较强的湿地保护区、河流沿岸和东北部山区;根据建设用地适宜性初步划定城市增长刚性边界和弹性边界,其中弹性增长边界与研究区土地开发建设实际情况相符;在弹性边界基础上确定的城市增长边界表现为城镇开发建设范围局限于中部、西南部区域.未来可以依据城市增长边界所确定的空间范围指导顺义区城市建设,促使城镇建设在合理的掌控范围内.

Urban growth boundary（UGB）is an important policy tool and technique on urban spatial growth management.Many countries have adopted the method of UGB to control urban sprawl.And how to identify scientifically the urban growth boundary for a city has still been in the exploration.This paper tries to build a comprehensive method for delineate urban growth boundary.First,it is based on the construction land suitability evaluation which determined the spatial pattern of land development and construction of study area.Second,determination urban growth elasticity boundary preliminary by construction land suitability evaluation results,and superimposed the construction zone determined by land use overall planning.Then,with reference to the land use change simulation map on the basis of CA-Markov model to modify urban growth boundary.The results show that（1）the high construction land suitability zone is located in the southwest of study area,which is concentrated in the construction zone of new town,and the low value zone is distributed in the area of ecological and water sensitivity of study area;（2）the urban growth boundary shows that the urban development and construction is limited to the central and southwestern regions.It can effectively restrain urban sprawl and guide urban growth toward a more compact pattern.