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在四川省、贵州省和重庆市选取了5个样区,参考各样区农村道路建设标准,优化富有长江上游经济腹地区域特色农村道路体系.借助ArcGIS9.3的空间统计分析功能和网络分析法,分析道路网络空间特征指数,揭示了区域道路体系及其网络特征的差异性和规律性.结果表明,长江上游经济腹地5个样区自然环境、社会经济等差异加剧了各级道路体系优化重点的区域差异:桐梓样区(贵州省)和秀山样区(重庆市)在优化路网的同时重在提高路面质量,芦山样区(四川省)、合川样区和忠县样区(重庆市)重在优化环路网;各样区的网络特征指数除成本比C指数有所降低外,其余均有不同程度提高;农村道路网络空间特征存在一定的规律性:道路密度与网络闭合度α指数、线点率β指数、网络连接度γ指数呈正相关关系,而与C指数呈显著负相关;Moran指数进一步表明:通过道路工程优化,地势相对陡峭的样区道路密度显著增加,而地势相对较平坦的样区道路密度增幅不大.因此,农村道路作为一个农村景观廊道或农田物质流、价值流通道,可用网络分析进行评价,并实现农村道路体系网络优化.
In Sichuan Province, Guizhou Province and Chongqing Municipality, five sample areas were selected, with reference to the standards of rural road construction in various districts, and to optimize the characteristic rural road system in the hinterland with the upper reaches of the Yangtze River.With ArcGIS 9.3 spatial statistical analysis and network analysis , Analyzes the spatial characteristics index of road network and reveals the difference and regularity of the regional road system and its network characteristics.The results show that the differences of natural environment, social economy and other five sample areas in the economic hinterland of the upper reaches of the Yangtze River exacerbate the focus of the optimization of the road system at all levels regional differences: Tongzi like region (Guizhou Province) and Xiushan like region (Chongqing) while optimizing road network focused on improving the quality of the road, like Lushan District (Sichuan Province), Aikawa and Zhongxian-like area like District (Chongqing ) Are mainly in the optimization of the ring network; the index of network characteristics in each area is increased to some extent except for the lower cost than the C index; the spatial characteristics of rural road network have certain regularity: the road density and the network closure degree α index, line rate index β, γ network connectivity index positive correlation, and was a significant negative correlation with C index; Moran index further show: optimized by road works, with the terrain The density of roads in steep areas increased significantly, while the density of roads in areas with relatively flat terrain did not increase much.Therefore, rural roads as a rural corridor or farmland material flow and value flow channel can be evaluated by network analysis Realize rural road system network optimization.