陆海交通连接工程对海岛区域景观格局时空演变的影响研究——以平潭综合试验区为例

Impact of land and sea transportation connection project on the spatial and temporal evolution of landscape patterns in the island region:a case study of Pingtan Comprehensive Pilot Zone

陆岛联通工程是沟通陆域与岛屿地域的重要纽带,探明陆岛连接交通工程对海岛地区景观格局时空演变的影响,对维护海岛地区生态环境质量,实现可持续发展具有重要意义。以福建省平潭综合试验区作为研究区域,利用2017-2022年10 m分辨率土地数据,借助面板回归模型,探究大陆-海岛交通连接工程对海岛区域景观格局时空演变的影响。结果表明:(1)2017-2022年,平潭综合试验区景观格局整体呈现斑块间连通性趋好、景观集聚性越来越高,破碎化程度、景观多样性和异质性程度在不断减弱;(2)在空间方面,平潭岛内与海岛边缘景观格局指数变化差异显著,集聚度及破碎化趋势岛内高于边缘地带;(3)面板回归模型显示,公铁大桥建设对景观蔓延度存在显著负面影响,说明公铁大桥开通在短时间内导致海岛整体景观格局趋向于破碎化。

The land-island transportation connectivity project is an important link between land and island regions.Therefore,it is of great significance to explore the impact of land-island connectivity transportation projects on the spatiotemporal evolution of the landscape pattern in island areas for maintaining the ecological environment quality of island areas and achieveing sustainable development.This study focuses on the Pingtan Comprehensive Experimental Zone in Fujian Province.We used 10 m resolution land use data from 2017 to 2022 to examine the impact of the mainland-island transport connection project on the spatial and temporal evolution of landscape patterns in the island region with the aid of a panel regression model.The results show that:(1)During 2017-2022,landscape pattern of Pingtan Comprehensive Experimental Zone showed a significant trend of improving inter-patch connectivity and increasing agglomeration,while the degree of fragmentation,landscape diversity,and heterogeneity continued to decrease;(2)From the spatial perspective,there are obvious heterogeneity of landscape patterns between central and fringe zone of the island,with the interior exhibiting higher aggregation and fragmentation trends compared to the edges;(3)The panel regression model shows that the construction of the public-railway bridge has a significant negative effect on landscape contagion,indicating that the opening of the public railway bridge has resulted in a fragmentation trend of landscape pattern in Pingtan island.