Exploring the urban–rural gradient effects of construction land expansion processes on land use function trade-off/synergy in rapidly urbanizing areas

Abstract

Construction land expansion greatly affects the supply and interaction of distinct land use functions, particularly in rapidly urbanizing areas. However, existing research rarely focuses on the urban–rural gradient role of different construction land expansion processes in affecting the interactions between land use functions, which limits the refined high-quality development of territorial space. Using the main urban area of Hangzhou as an example, this research analyzed the spatiotemporal transmission process of trade-offs/synergies among distinct functions between urban and rural regions from the living-production-ecological function perspective, and probed the differences in the impact of distinct urban and rural construction land expansion processes on them across different urban–rural gradients, thereby proposing the urban–rural spatial development pathways for promoting synergistic territorial spatial patterns. The results showed that the changes in different functions had an obvious urban–rural gradient difference. During 2000–2020, the trade-off between living function and other functions increased continuously, and regions with a higher trade-off primarily shifted from urban development areas to urban–rural transition areas. The infilling and edge-expansion of urban construction land were more favorable to the increased synergy between distinct functions; the infilling and edge-expansion of rural construction land in urban development and urban–rural transition areas greatly reduced the functional trade-off level, while its leapfrogging in rural development areas strongly affected the synergy between distinct functions. These findings can help to restrict unreasonable urban and rural construction land expansion processes as well as promote synergistic territorial space patterns in rapidly urbanizing regions.