JOURNAL OF NATURAL RESOURCES ›› 2021, Vol. 36 ›› Issue (1): 162-175.doi: 10.31497/zrzyxb.20210111

• Ecosystem and Ecological Preservation • Previous Articles     Next Articles

Delimitation of urban growth boundary in ecologically vulnerable areas in the Upper Yellow River: Take Linxia Hui Autonomous Prefecture as an example

YANG Xue-di1(), BAI Yong-ping1(), CHE Lei2, ZHOU Liang3,4, QIAO Fu-wei1, WANG Zhi-guo1   

  1. 1. College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China
    2. School of Architecture and Urban Planning, Nanjing University, Nanjing 210093, China
    3. State Key Laboratory of Resources and Environmental Information Systems, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
    4. Faculty of Geomatics, Lanzhou Jiaotong University, Lanzhou 730070, China
  • Received:2020-04-28 Revised:2020-11-16 Online:2021-01-28 Published:2021-03-28
  • Contact: BAI Yong-ping E-mail:yxdlz01@163.com;baiyp@nwnu.edu.cn

Abstract:

The Yellow River Basin is an important ecological barrier and economic zone in China, and its upstream water-conserving areas play a decisive role in the sustainable ecological development of the Yellow River Basin. Therefore, scientific coordination of urban and rural development and reasonable delineation of urban growth boundary (UGB) are of great significance for ecological protection and high-quality urban development in the Upper Yellow River Basin. This paper takes Linxia, a typical prefecture-level city in the upper reaches of the Yellow River, as the research object, and assesses its ecological quality based on land use and related remote sensing data using remote sensing ecological index (RSEI) and ecological sensitivity analysis. On this basis, the future urban growth boundary development with and without ecological quality assessment conditions is analyzed in combination with CA-Markov comparison. The results show that: (1) From 2005 to 2015, the overall ecological environment of the study area was poor and decreased year by year, and the ecological quality (RSEI) result dropped to the lowest (0.38) in 2015. Meanwhile, the ecological sensitivity changed from moderate to low sensitivity. (2) The urban expansion area increased by 6.04 km2, and the scale of urban construction land in 2030 obtained by CA-Markov simulation was 95.88 km2, which exceeded the planned area by 3.2 km2, and the urban expansion was not effectively restrained. (3) Simulation of RSEI-CA-Markov shows that the urban construction land in 2030 is 90.36 km2, which is smaller than the planned government planning area of 3.3 km2, and meets the requirements of urban sustainable development. Based on this, the designated UGB has stronger urban management capabilities. The delineation of UGB in the ecologically fragile area in the Upper Yellow River is conducive to guiding and realizing sustainable urban development, which can also provide reference for the sustainable development of other ecologically fragile cities in China.

Key words: Upper Yellow River, ecologically fragile area, RSEI-CA-Markov model, urban growth boundary, Linxia Hui Autonomous Prefecture