Under the constraint of carbon emission, measuring and analyzing the spatial-temporal evolution characteristics of urban land use efficiency in the Yangtze River Economic Belt is the inherent requirement of its ecological protection and sustainable development. In this paper, we calculated the urban land use efficiency of 107 cities in the Yangtze River Economic Belt from 2006 to 2020 by using the SBM-Undesirable model with unexpected output, and analyzed its temporal evolution trend and spatial correlation relationship by using kernel density and spatial autocorrelation method. The results showed that: except in 2020, the urban land use efficiency was generally low due to the COVID-19 epidemic, and the urban land use efficiency in other years was mostly concentrated in the middle levels, and showed a trend of slow fluctuation and rise year by year. The difference of urban land use efficiency level between regions increased, and the dispersion degree in upstream, midstream and downstream increased with each passing year. Urban land use efficiency spatial imbalance was significant, and the urban land use efficiency level of large and medium-sized cities was generally lower than that of cities with low economic development level. The spatial correlation was weak, and the global spatial autocorrelation was basically insignificant, while the local spatial agglomeration areas were mainly distributed in the upstream and downstream regions, with a small distribution range and weak spatial interaction. The distribution areas of the standard deviation ellipse were gradually flattened, and the center of gravity as a whole shift significantly to the southwest. The research results are helpful to understand the development history and future trend of urban land use efficiency in various regions, and propose that cities should consider the impact of public crisis events in advance, reasonably control the scale of land expansion, and lead coordinated development and other reasonable suggestions when formulating land use policies.
Exploring the sensitivity of ecosystem service value (ESV) under land use transformation (LUT) is helpful to promote the rational use of regional land, improve the regional ecological environment carrying capacity, and realize the sustainable development of human beings. Using land use data of Jiangjin Chongqing from 2009 to 2019, this study measured the effect of ecological service value under land use transition in Jiangjin, and analyzed the spatiotemporal evolution characteristics of ecosystem service value based on the land use transfer matrix, change contribution rate (ESVab) and Coefficient of improved cross-sensitivity (CICS). The results showed that 1) the total ESV increased year by year, the ESV change of woodland was the largest, followed by water bodies and cultivated land from 2009 to 2019 in Jiangjin; 2) taking the Yangtze River as the boundary, the ESV in the south was higher than that in the north, but the ESV in the north and south of the Yangtze River increased to different degrees; 3) the contribution rate of forest land was the largest, the contribution rate of cultivated land and woodland was highly correlated with topography and slope, and the contribution rate of water bodies had no obvious spatial distribution characteristics from 2009 to 2019; 4) the CICS between cultivated land, woodland and other land types was higher, and mainly in the medium-high ecological sensitive areas, while the conversion between water bodies, built-up land and other land types was mainly in the medium-low ecological sensitive areas; and 5) the ecologically sensitive areas of the conversion between grassland, unused land and other land types were scattered, and the highly ecologically sensitive areas of the conversion between unused land and other land types were mainly distributed in the southern mountainous area of Jiangjin. It aims to provide important guidance for solving the contradiction between humanity and land and regional environmental problems, so as to realize the sustainable development of the region and environment.
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