提升城镇土地利用效率、促进城镇高质量发展成为区域可持续发展和国土空间优化的重要内容和有效途径。以江苏大丰区为例,基于土地利用变化历史数据和驱动机制完成2025年滨海地区土地利用格局的预测模拟,构建了随机前沿函数模型,实现建设用地利用效率数量特征与时间过程的定量刻画,形成建设用地利用效率与建设用地扩张脱钩关系的地理区域变化规律的客观表达,提出了新时期大丰区应坚持“严控增量、盘活存量、提升质量”的建设用地利用基本策略。结果 表明:(1)2016—2025年大丰区耕地、沿海湿地和水域等生态用地继续减少,建设用地增长32.47 km2,侵占沿海湿地和水域以及向沿海扩张是主要特征;(2)2000—2025年建设用地利用效率持续增长,镇级平均建设用地利用效率先后由0.592(2000年)提升至0.665(2016年)和0.682(2025年),地区差别化的产业结构和土地利用主体功能是建设用地利用效率空间差异的主导因素。(3)2000—2012年乡镇建设用地利用效率与建设用地扩张总体处于强脱钩关系,2012年后建设用地扩张、利用效率提升均放缓,总体表现为复钩和负脱钩关系。滨海地区建设用地利用效率与建设用地扩张脱钩关系时空演变规律可为国土空间优化利用、滨海土地资源管理提供参考,研究框架与方法集成是兼顾建设用地扩张和效率提升研究课题的有益补充。
Improving urban land use efficiency and promoting high-quality urban development have become the important contents and effective ways for regional sustainable development and land space optimization. Taking Dafeng District of Jiangsu Province as an example, we completed the scientific simulation of land use pattern in 2025 based on historical data and driving mechanism of land use change, and established a stochastic frontier function model to realize the quantitative description of the quantitative characteristics and time process of construction land use efficiency. The objective expression of the geographical change pattern of the decoupling relationship between the construction land use efficiency and construction land sprawl suggested that Dafeng District should adhere to the basic strategy of ‘controlling increments, revitalizing stocks, improve quality'. The results show that:(1)during the period 2016—2025, the ecological lands of Dafeng such as cultivated land, coastal wetlands and water bodies continued to decrease; the construction land continued to increase by 32.47 km2; invasion of coastal wetlands and expansion to the coast were the main features;(2)the utilization efficiency of construction land increased rapidly in the period from 2000 to 2025; the average utilization efficiency of construction land at town level had been raised from 0.592 in 2000 to 0.665 in 2016 and 0.682 in 2025; the differentiated regional industrial structure and the major land use function are the dominant factors in the spatial difference of construction land use efficiency;(3)from 2000 to 2012, the utilization efficiency of township construction land and the expansion of construction land were generally in strong decoupling relationship; after 2012, the expansion of construction land and utilization efficiency had slowed down trend, there was a general double hook and coupling relationship between the two; the spatiotemporal evolution law of the construction land use efficiency and its decoupling from construction land expansion in the coastal area can provide decision-making reference for the optimization of land space. The research framework and methodology are useful supplements to the research content of the construction land sprawl and its efficiency improvement.
