JOURNAL OF NATURAL RESOURCES ›› 2020, Vol. 35 ›› Issue (1): 204-216.doi: 10.31497/zrzyxb.20200117

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Ecological remediation zoning of territory based on the ecological security pattern recognition: Taking Jiawang district of Xuzhou city as an example

NI Qing-lin1, HOU Hu-ping1,2, DING Zhong-yi1,2, LI Yi-bo3, LI Jin-rong1   

  1. 1. School of Environment Science and Spatial informatics, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China;
    2. Jiangsu Key Laboratory of Resources and Environmental Information Engineering, CUMT, Xuzhou 221116, Jiangsu, China;
    3. Xuzhou Institute of Ecological Civilization Construction, Xuzhou 221008, Jiangsu, China
  • Received:2019-10-11 Revised:2019-12-09 Online:2020-01-28 Published:2020-01-28

Abstract:

Ecological security pattern is crucial for implementing the systematic ecological remediation in the resource-exhausted city. It can assist the government in clarifying and facilitating the orientations and priorities in ecological remediation practices. An ecological remediation zoning of territory based on the ecological security is proposed. In the framework, three-phrase remote sensing images, historical mine information, and GIS spatial analysis are utilized. With the application of the paradigm of ecological pattern research, the essential elements of an ecological pattern are obtained. Ecological source areas are recognized from the perspectives of connectivity, sensitivity, and importance. The ecological resistance surface was revised based on the information of the past minefield boundary. By the application of circuit theory, ecological corridors, and other possible areas of ecological processes were identified. Based on the space superposition of the ecological-source area, barrier area, and resistance surface, the ecological remediation zones are delineated along with the consideration of the needs of ecological restoration, the difficulty of ecological processes, and the characteristics of ecological factors. A case study of Jiawang district in Xuzhou city, Jiangsu province is used to demonstrate the application of the proposed method. Results indicate that the average area of ecological sources accounts for almost 20% of the whole district in 2000, 2008 and 2016. The percentage of ecological sources rose before 2008 and fell after 2008 because of urbanization and mine closure. On the contrary, the change of the ecological resistance surface has an opposite trend due to the fact that urbanization becomes the dominant factor. In the past three phrases, the distributions of ecological corridors have an obvious spatial similarity overall, but differentiation within each town. These corridors are either along the rivers or in the low hilly area with good vegetation coverage. However, they are sparsely distributed in the central-, southern-, and southwestern parts of the region. The barrier areas are overlapping among different phrases and sitting to the northern side of the Beijing-Hangzhou Grand Canal, in which obstruction level is higher in the northern and central parts. Due to the treatment of the subsidence area after mine closure, the area of barrier began to decline. Four ecological restoration zones, namely ecological conservation zone, ecological upgrading zone, ecological restoration zone and ecological control zone, are divided into areas of 144.38 km2, 189.60 km2, 182.68 km2 and 103.34 km2, respectively. These findings can provide spatial guidance for ecological transformation and ecological remediation in Jiawang district.

Key words: ecological security pattern, Jiawang district, ecological remediation zoning, circuit theory