外部性视角下县域经济空间网络对生态效率的影响研究——以江苏省为例

Influence of County Economic Spatial Network on Eco-efficiency in Jiangsu Province from Perspective of Externalities

基于网络外部性,探索区域间经济关联对生态效率的影响,在一定程度上突破了物理边界,可更好地探索经济空间组织模式对资源环境的影响。以江苏省为研究对象,分析县域经济空间网络对生态效率的影响,得到结论:(1)县域生态效率呈现出波动增加趋势,并呈现“南高北低”的地带性差异特征,市辖区生态效率整体较高;(2)县域经济空间关联日趋密切,连通性、可达性、稳定性不断增强,但空间关联关系及互动水平仍然相对较弱,点度中心度、接近中心度和中介中心度均呈现出南高北低的空间分布特征;(3)网络密度和网络关联度的增加、平均路径长度和网络效率的降低均能够有效地促进生态效率的提高,点度中心度有利于本县域及整体生态效率提升,接近中心度有利于本县域生态效率提升,而阻碍其它县域及整体生态效率提升,中介中心度有利于本县域、其它县域及整体生态效率提升,县域经济空间网络对生态效率的影响主要源于县域经济空间网络外部性所带来的空间溢出效应。

The contradiction between China’s economic development and the protection of natural resources and the environment remains prominent.Reducing the damage and impact of economic activities on the natural resources and the environment through the scientific optimization of the organization structure and spatial layout of human activities is an important research topic in geography.Based on network externalities,this study focused on inter-regional economic correlations and their impact on the resources and environmental pressures,and explored the internal formation mechanism to break through physical boundaries.This study aimed to better understand the impact of spatial organization modes on resource use and environmental pressure.This paper examined the connection between county-level economic spatial networks and eco-efficiency exemplified in Jiangsu Province.The findings were as follows:(1)County-level eco-efficiency demonstrated fluctuations with an upward trend and showed zone differences,with higher eco-efficiency levels in municipal districts than other counties.(2)Spatial correlations among the county’s economy became increasingly tight,while connectivity,accessibility,and stability were continuously improved.However,the spatial correlation and interaction level remained weak.The spatial distribution characteristics indicated that point degree centrality,proximity centrality,and intermediate centrality were higher in the south and lower in the north,with an increase in mean value and range over time.(3)It was found that increases in network density and correlation degree,and decreases in average path length and network efficiency could improve overall ecological efficiency.Point centrality degree might promote local county and overall ecological efficiency.Proximity to the center could enhance local ecological efficiency but might hinder improvements in other counties and overall ecological efficiency.Meanwhile,intermediate centrality could raise the ecological efficiency of the local county,other counties,and the entire region.The impact of the county economic spatial network on eco-efficiency mainly came from the spillover effects in the network externality of the county economic spatial network.This study demonstrated the close relationship between county-level economic spatial networks and eco-efficiency.The economic spatial networks affected ecological efficiency through the attributes of nodes and edges.The centrality and externality of economic spatial networks jointly influenced eco-efficiency.Based on the findings of this study,relevant policy recommendations were proposed.