省域高速公路路域景观格局与生态质量评价OA

The ecological environment quality of Fujian province remains excellent and stable.It is helpful to reveal the effects of the provincial expressway network evolution on the landscape ecology by studying the expressway network landscape and its impact on ecological quality.This study selects 3 km on both sides of the expressways in Fujian province as the research area,utilizes GIS technology,Fragstats software with landscape pattern indices,the remote sensing ecological index(RSEI),and the InVEST model,to investigate the evolution of landscape patterns and ecological quality of expressway corridor in Fujian province from 1994 to 2022.The results show that:the 30-90 m range constitutes the primary scale domain for the expressway corridor scale effect analysis,with 40 m being identified as the optimal grain size for landscape pattern analysis of the expressway corridor.The fragmentation index of cultivated land,forestland,grassland,water area and unused land have increased in varying degrees,while the fragmentation index of construction land has continued to decline.The overall fragmentation of the expressway corridor has intensified,the dispersion of various types has increased,and the stability of the ecosystem structure has declined.Carbon storage of the expressway corridor,forest land,and grassland has declined,while cultivated land,water area,unused land,and construction land increased in varying degrees.Areas with greater changes in carbon storage are mainly located in coastal cities with faster development.The average RSEI value of the expressway corridor is higher than 0.6,and the ecological environment quality is good.The areas with poor and relatively poor RSEI levels in the expressway corridor are mainly distributed in the southeastern coastal cities of Fujian province.The ecological environment quality of the expressway corridor improved and deteriorated are roughly the same over the 28 years.The fragmentation index and RSEI value within 1 000 m of the expressway corridor are most significantly affected,and the impact beyond 1 000 m gradually weakens.