贵州省县域“三生空间”功能效率时空特征与动态解耦过程

Spatial-temporal Characteristics and Dynamic Decoupling Processes of the Functional Spatial Efficiency of the"Production-Living-Ecological"in the County Area of Guizhou Province

本研究揭示贵州省县域“三生”功能效率的时空变化与动态解耦过程,为县域空间规划布局提供理论支持。以贵州省88个县域单元为研究对象,以2000—2020年为考察时段,运用PLS-SEM模型、GA-BP神经网络和动态变动指数对功能效率时空特征进行分析,并借助解耦分析模型对两大系统的解耦过程给予动态研究。结果表明:(1)在空间上,生产空间功能效率呈东北—西南走向的轴线分布特征。生态环境空间则无明显空间分布特征。(2)在时间上,紫云县、镇远县呈起点较低但发展较快的特征,而其他县域单元变化不大。生态空间功能效率变化并未呈现显著的空间分布规律,但毕节市和黔东南下辖单元变动较大。(3)多数单元两大系统2000—2020年呈由扩张性耦合到强解耦状态转变,空间利用优势由生产空间向生态空间转变,解耦关系趋向良性方向发展。

This paper reveals the spatial and temporal variation and dynamic decoupling process of the functional efficiency of the"production-living-ecological"of counties in Guizhou province,and provides theoretical support for the spatial planning layout of counties.Using 88 county units in Guizhou province as the research object and the period 2000-2020 as the investigation period,the spatial and temporal characteristics of functional efficiency are analyzed by using PLS-SEM model,GA-BP neural network and dynamic change index,and the decoupling process of the two systems is studied dynamically utilizing decoupling analysis model.The results show that:(1)Spatially,the functional efficiency of the production spatial is distributed in a north-east-south-west axis.The ecological space has no prominent spatial distribution characteristics.(2)In time,Ziyun and Zhenyuan show a lower starting point but faster development,while the other county units do not change much.Changes in the functional efficiency of ecological spatial do not show a significant spatial distribution pattern,but the units under Bijie and Qiandongnan are more variable.(3)Most units of the two systems show a shift from expansive coupling to a state of solid decoupling from 2000 to 2020,with the advantage of spatial use shifting from production space to ecological space and the decoupling relationship tending to develop in a benign direction.