京津冀市域建成区绿地率时空分异特征及影响机理研究

Spatiotemporal Differentiation Pattern and Its Influence Mechanism of Green Rate of Built Districts in Beijing-Tianjin-Hebei Urban Agglomeration

实现城市绿地合理规划的重要前提是科学认知其空间分异特征及形成机理,难点在于识别影响其空间分异的主导因素以进行针对性调控。文章选取京津冀地区作为研究区域,以32个建制市为样本单元,综合应用空间分析、地理探测器等方法,揭示1996—2016年市域建成区绿地率时空分异演变特征及影响机理。研究表明:①时序变化上,总体呈持续增长态势且高于全国水平,内部差异逐步缩小但长期存在。②空间分异上,整体水平“由中心向四周”逐渐降低,增长速率及幅度“由北向南”逐步提高。③影响因素探测上,社会经济政策类因子的影响力较自然地理环境类因子更显著,其中产业结构升级的驱动力最强。双因子交互作用力普遍高于单因子,人口密度在交互过程中提供持续驱动力。通过研究,以期为科学制定京津冀城市绿地建设政策、实现绿地协同发展提供科学依据,亦对其他城市群绿地研究提供借鉴。

Recognizing urban green space’s spatial-temporal differences and influence mechanism scientifically has become an important premise of formulating the rational plan, while the difficulty lies in identifying the dominant factors for targeted regulation. This paper takes the Beijing - Tianjin - Hebei urban agglomeration with 32 provincial-level administrative regions as the research area. Synthetically apply space analysis, geographical detector and other methods to reveal the spatial-temporal evolution characteristics and dominant factors of the green rate of built district from 1996 to 2016. The result shows:① As the times pass, it presents a sustained growth trend and is above the national level. The internal differences gradually reduce, but persist for a long time.② In the space differentiation, it shows a distribution pattern of development level from center to surroundings, which gradually decreases, meanwhile the growth rate and range from north to south gradually increases.③ In the detection of influencing factors, the factors of social-economic-policy demonstrate a more significant driving force than those of natural-geographical-environment, and the industrial structure upgrading presents the strongest influencing factors. The combined effect of two factors is stronger than that of one factor, and the population density provides a continuous driving force in the interaction progress.