关键词: 城乡建设用地开发强度, 空间特征, 地理探测器, 影响因素, 兰西城市群

Abstract: It is significant to define the three lines of "urban growth boundary (UGB), ecological security red line and cultivated land protection red line" to clarify the spatial pattern characteristics and evolution process of land development intensity. 39 county-level units of the Lanzhou-Xining(Lan-Xi) urban agglomeration in 1995, 2005, 2015 and 2018 were taken as research object and trend surface analysis, spatial autocorrelation and geo-detection methods were used to analyze the spatial pattern characteristics and influencing factors of urban-rural construction land development intensity in the Lan-Xi urban agglomeration. Results show that, (1) The development intensity of urban-rural construction land in the Lan-Xi urban agglomeration increased from 2.74% in 1995 to 4.45% in 2018. The development intensity of Lanzhou and Xining was the highest, and then decreased from the core areas to peripheral regions;(2)The development intensity of urban-rural construction land in the east and west was relatively low, and those in Lanzhou and Xining were relatively high, which showed an "inverted U-shaped" curve;(3)There was a significant positive correlation of construction land development intensity, and the agglomeration characteristics were obvious, the spatial distribution of cold and hot spots were relatively stable;(4)From 1995 to 2018, the development intensity of urban-rural construction land was affected by factors such as population agglomeration, economic development, industrial structure and altitude. The results of the research can provide reference to the government authorities for decision-making on the control of urban-rural construction land development intensity for high-quality development in the Lan-Xi urban agglomeration.

Key words: development intensity of urban-rural construction land, spatial characteristics, geodetector, impact factor, Lan-Xi urban agglomeration