陕南秦巴山区道路网络对流域单元景观格局破碎化的差异性影响OA

In ecologically fragile areas,road expansion exacerbates issues such as landscape fragmentation and biodiversity loss.The study takes the Qinba Mountain region of Southern Shaanxi,a typical ecologically fragile region,as the research subject,constructs a five-dimensional landscape fragmentation evaluation system encompassing quantity,shape,area,aggregation,and connectivity.The spatial heterogeneity effects of different road structure characteristics on multi-dimensional landscape fragmentation are further investigated based on multi-scale geographically weighted regression(MGWR).The results show that:regional landscape fragmentation exhibits significant spatial differentiation,with Baoji,Xi'an,and Weinan forming a low-fragmentation core area,Shangluo serving as a moderate fragmentation transition zone,and central Hanzhong and Ankang constituting high fragmentation clustering areas.Sensitivity to road disturbance varies across multi-dimensional fragmentation features,with quantity and area characteristics being the most sensitive,followed by shape and connectivity features,while aggregation features exhibit the weakest sensitivity.Road density and distance from roads have the strongest explanatory power for the number,area,and connectivity of ecological patches,with lower-grade roads exerting a greater influence than higher-grade roads.Road curvature shows a significant negative correlation with the shape of ecological patches,whereas network degree centrality correlates with both patch shape and area.The study can provide a reference basis for future road construction and ecological conservation in the Qinba Mountain region of Southern Shaanxi.