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Arid Land Geography ›› 2023, Vol. 46 ›› Issue (9): 1503-1513.doi: 10.12118/j.issn.1000-6060.2022.551

• Ecology and Environment • Previous Articles     Next Articles

Construction of ecological security pattern in Shannan Wide Valley Basin of Yarlung Zangbo River

LI Hongqing(),YANG Yu,ZHANG Junhong   

  1. School of Public Administration, Hohai University, Nanjing 210098, Jiangsu, China
  • Received:2022-10-23 Revised:2022-11-30 Online:2023-09-25 Published:2023-09-28

Abstract:

Shannan Wide Valley Basin is one of the prime valleys of the Yarlung Zangbo River of China. The geographical environment of the basin makes it vulnerable to land desertification and ecological degradation, while also making it an important belt of economic development along the river. Ecological security patterns can provide a reference for future improvements in ecological functions and economic development. Based on the evaluation of ecosystem services and ecological sensitivity, the ecological source areas were identified. The minimum cumulative resistance value was used to determine ecological security zones and ecological corridors, and the ecological security pattern of the Shannan Wide Valley Basin was constructed for 2020. The results showed that: (1) The ecological source area of the basin was found to be 1089.68 km2, with distribution mainly occurring in grassland and forest areas of Gonggar County, Zhanang County, and Nedong District. (2) Zones of maximum, high, medium, low, and minimum ecological security were established, accounting for 24.74%, 51.24%, 10.31%, 5.43%, and 8.28% of the total basin area, respectively. To ensure ecological security, different measures should be applied at each level of the ecological security zone. (3) The constructed ecological security pattern comprised 105 ecological corridors with a total length of 4720.08 km, together with various ecological source areas, ecological source points, and ecological security areas. (4) In addition to the current land use situation in Shannan Wide Valley, moderate industrial development should take place on the southern banks of the river, while ecological protection measures should be the focus for the northern banks. Further, the “one land, one field, two districts, and four parks” development pattern should be followed.

Key words: ecological security pattern, Shannan Wide Valley Basin, minimum cumulative resistance model, ecosystem service function, ecological sensitivity