珠三角城市群建设用地转型指数测度与格局演变

Index Measurement and Pattern Evolution of Construction Land Transformation in the Pearl River Delta Urban Agglomeration

文章基于土地利用系统“结构—功能—效益”要素嵌套人地耦合“生产—生活—生态”属性构建了建设用地转型理论框架和测度指标体系,并运用组合赋权模型、TOPSIS模型及空间差异测度方法对2004—2020年珠三角城市群建设用地转型进行了综合测度,探究了其时空格局演变特征和成因。研究发现:(1)研究期内珠三角城市群建设用地转型呈现先波动上升后波动下降、增减交替、趋于平稳的两阶段波动演化趋势,空间差异化程度呈缩小态势。(2)建设用地结构转型呈现以“广深莞”三市为轴心向周边地区递减的空间分布格局,空间差异化程度扩大,空间极化效应明显且具有较强的突变性和波动性。(3)建设用地功能转型呈现中间高外围低的“核心—边缘”空间分布格局,空间差异化程度有所缩小但扩散效应并不明显,空间均衡协调发展水平有待提升。(4)建设用地效益转型呈现以深广为双核心的梯度递减空间分布格局,空间差异化程度扩大,空间均衡协调发展水平严重失衡。同时,建设用地转型框架体系强调土地利用系统与以人类活动为主体的生产、生活、生态属性的相互作用关系,从土地利用系统视角实现了显性形态转型和隐性形态转型的系统集成。

The study constructs a theoretical framework and measurement index system for construction land transformation,based on"structure-function-benefit"elements of the land use system,coupled with the"production-lifeecology"attributes,comprehensively measures the construction land transition in the Pearl River Delta(PRD)urban agglomeration from 2004 to 2020 using the combination empowerment model,TOPSIS model and spatial difference measurement method,and analyzes the evolution characteristics and causes of its spatio-temporal pattern.It's found that:1)The transformation of construction land in the PRD urban agglomeration shows an evolutionary trend which is fluctuating upward and then fluctuating downward,alternately increasing and decreasing,and tends to be stable,and the degree of spatial differentiation is narrowing.2)The structural transformation of construction land shows a spatial pattern which takes Guangzhou,Shenzhen and Dongguan as the axis to the surrounding areas,with obvious spatial polarization effect and strong mutability and volatility.3)The functional transformation of construction land presents a spatial pattern of"core-edge"with high in the middle of the PRD urban agglomeration and low in the periphery of the PRD urban agglomeration,and the degree of spatial differentiation has been reduced,but the diffusion effect is not obvious.4)The efficiency transformation of construction land presents a gradient decreasing spatial pattern with Shenzhen and Guangzhou as the double cores,the degree of spatial differentiation is enlarged,and the level of balanced and coordinated spatial development is seriously imbalanced.The framework system of construction land transformation emphasizes the interaction between land use system and the production,life and ecological atributes with human activities as the main body,and realizes the systematic integration of explicit form transformation and implicit form transformation from the perspective of land use system.