Resources Science ›› 2019, Vol. 41 ›› Issue (7): 1262-1273.doi: 10.18402/resci.2019.07.07

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Urban construction lands and their carbon emission differences east and west of the Hu Huanyong Line

Mei ZHANG1,2(), Xianjin HUANG1,2(), Xiaowei CHUAI1, Zhenyu ZHU2, Yu WANG2   

  1. 1. School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China
    2. School of Urban and Civil Engineering Sciences, Jinling College of Nanjing University, Nanjing 210089, China
  • Received:2018-12-26 Revised:2019-03-01 Online:2019-07-25 Published:2019-07-25

Abstract:

The utilization and expansion of urban construction lands produce a large amount of carbon emissions. Revealing the differences of carbon emissions of urban construction lands on the east and west of the Hu Huanyong Line and finding the driving factors can provide important references for the coordinated development of East and West China, carbon emission reduction, and new urbanization. However, there is a lack of comparative research on the changes of urban construction land and carbon emissions in these two regions. With the help of night light remote sensing data and GIS technology, a new method of extracting urban construction land was proposed, and the urban construction lands east and west of the Hu Huanyong Line were extracted and analyzed. The carbon emissions from the urban construction lands were estimated and analyzed through applying the carbon emission estimation methods of relevant literature. Based on these results, the correlations between urban construction lands and carbon emissions were analyzed. Combining with socioeconomic data, the results were discussed in depth. This work indicates that: (1) The results of the boundary-threshold method were better than that of the empirical threshold method and the neighborhood analysis method. (2) The Hu Huanyong Line has the possibility to be broken. From 2000 to 2013, the ratio of the areas of urban construction lands between the east and the west lowered from 95:5 to 92:8. (3) The rapid development of the western regions is at the cost of high carbon emissions. The ratio of annual carbon emissions between the east and the west lowered from 93:7 to 90:10. (4) According to the average level, when the urban construction land in the east and west increased by 1 km2, annual carbon emissions of urban construction land increased by 17.94 thousand tons and 25.75 thousand tons, respectively. While continuing to pay attention to the eastern regions with a large amount of carbon emissions, China should also pay attention to the exacerbating problem of high carbon emissions in the western regions. Methods such as promoting intensive use of urban construction land, optimizing industrial structure, and advocating a green and low-carbon lifestyle can be taken to help the western regions to embark on a new road of intensive and low-carbon urbanization.

Key words: Hu Huanyong Line, urban construction land, carbon emission, spatiotemporal difference, boundary-threshold method, night light remote sensing data