Analysis of railway accessibility in Fujian Province and the influence of economic development on its spatial differentiation.

Understanding railway accessibility supports railway regulation and development, but few studies consider different perspectives. We study the spatial distribution of accessibility indicators at the county (city) scale in Fujian Province by spatiotemporal syntax and weighted average travel time using railway timetable data. Export trade, rich commercial activities, and high-speed rail had a significant positive effect on objective accessibility. Fuzhou, Sanming, and Longyan were main transfer centers. The most accessible nodes based on weighted average travel time formed a "U"-shaped corridor along the coast. The county-wide average accessibility was 1.72 h. According to spatiotemporal syntax, local general public budget expenditure (0.758993) and export volume of goods-total retail sales of consumer goods (0.956257) had the most interactive impact, while according to weighted average accessibility, import volume of goods (0.618447) and per capita gross regional product-import volume of goods (0.878573) did. These results provide reference for transportation planning and regional development in Fujian Province.

Predicting the minimum scale of urban ecological space based on socio-ecological systems analysis.

Determining the minimum scale of ecological space that is sufficient for sustainable urban development is one of the difficult tasks in quantitative urban ecological research. In this study, we first expounded on the basic concept of the minimum scale of urban ecological space and reviewed the research status. Supported by the theory of "aggregation and dispersion" in landscape ecology, we converted the task of scale prediction into spatial accounting-oriented scenario simulation. We then proposed a method to predict the scale, based on an analysis of socio-ecological systems, and constructed a research framework of "construction constraint analysis - ecological importance evaluation scale prediction." The rules to discriminate the optimal scenario and the characteristics indices of the network were also proposed. Second, we selected Shenzhen City as a representative study object and constructed 87 ecological networks under different scenarios, based on the construction constraints and spatial distribution of ecosystem services, identified from the multi-source data in the study area. By calculating and comparing the network efficiency and clustering coefficient, we concluded that the network under the m39 scenario has the optimal connection efficiency and structural stability. We finally obtained a threshold of 48.85 % as the minimum proportion of ecological land in Shenzhen. We expect that this result can help improve the rationality of decision-making in urban spatial planning and governance.