This study took the Poyang Lake ecological economic zone as the research area,and using morphological spatial pattern analysis,explored the morphological spatial characteristics of the fragmentation of cultivated land from 2000 to 2020.Furthermore,based on land use transition matrix methods,spillover effect analysis,and landscape pattern index analysis,this study analyzed the spatiotemporal characteristics in which construction land expands by occupying cultivated land as well as the spatiotemporal response of the landscape pattern of the cultivated land.From 2000 to 2020,the degree of cultivated land fragmentation gradually strengthened and the reduction rate of the core area increased from 1.33%to 6.27%.At the same time,it was shown that the regional difference was gradually strengthened from the plain around Poyang Lake to the mountainous and hilly areas,and the expansion of construction land led to the fragmentation of cultivated land.From 2000 to 2020,the area of cultivated land occupied by construction land increased from 268.60 km2 to 1 003.26 km2,and mainly occurred in areas with a mature road network.The spillover effect of construction land expansion is gradually increasing,and it is more significant in areas with a mature road network.The expansion of construction land has a strong positive effect on cultivated landscape fragmentation,and road construction strengthens this effect.Meanwhile,cultivated landscape fragmentation shows a greater difference with the reduction of road buffer distance.The degree of cultivated land fragmentation is significantly affected by topography and construction land expansion.In addition,the fragmentation of cultivated land mainly occurs in areas with large relief or dense construction land and a mature road network.
关键词
景观破碎化/耕地/形态学空间格局/扩张/建设用地/道路网络/景观格局指数
Key words
landscape fragmentation/cultivated land/morphological spatial pattern/expansion/construction land/road network/landscape pattern index
维普
万方数据