Spatiotemporal differentiation and influencing mechanism of construction land use efficiency of shrinking cities： A case study of Yichun city of Heilongjiang province

Abstract

Construction land is a spatial carrier of urban economic and social activities, and its utilization efficiency is an important basis for regulating the expansion and allocation of construction land. This study took the shrinking city Yichun of Heilongjiang Province as an example, and used data envelopment analysis (DEA) model and Geodetector to analyze the spatiotemporal change and influencing mechanism of spatial differentiation of construction land use efficiency from 1995 to 2015. The research reveals the following points: 1) The overall level of construction land use efficiency in Yichun City is not high, and it generally shows a trend of "rising first and then descending" from 1995 to 2015. From the perspective of temporal change, the regional differences of construction land use efficiency in Yichun were gradually decreasing, and the overall efficiency level developed towards a low- level equilibrium. 2) From the perspective of regional differences and spatial characteristics, the regional differences of construction land use efficiency in Yichun were obvious. Construction land use efficiency showed a decreasing trend from the northern and southern ends to the central part, which generally forms a spatial pattern of "high in the peripheral area and low in the core area". 3) Construction land use efficiency change in Yichun is the result of the joint action of multiple factors. The differences in per capita GDP of secondary and tertiary industries, non- agricultural population density, rationalization of industrial structure, optimization of industrial structure, and non- agriculturalization rate are highly related to the spatial differentiation of construction land use efficiency. However, the influence degree and sensitivity of some factors are slightly different in different periods.