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Journal of Desert Research ›› 2022, Vol. 42 ›› Issue (6): 85-93.DOI: 10.7522/j.issn.1000-694X.2022.00071

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Evaluation on ecological resilience in water conservation area in the upper Yellow River based on AHP: A case study of the Gannan and Linxia region

Xinpeng Li1,2(), Chaoping Wang3, Songbing Zou1,2(), Wei Yue4, Shan Luo1,2, Wenshu Wang1,2, Yihao Qin1,2, Jun Sang1,2, Jikun Qian1,2, Chunmiao Wang1,2   

  1. 1.College of Earth and Environmental Sciences /, Lanzhou University,Lanzhou 730000,China
    2.Key Laboratory of Western China's Environmental Systems /, Lanzhou University,Lanzhou 730000,China
    3.Office of Science and Technology, Lanzhou University,Lanzhou 730000,China
    4.Gansu Academy of Eco-Environmental Sciences,Lanzhou 730020,China
  • Received:2022-01-22 Revised:2022-04-18 Online:2022-11-20 Published:2023-01-09
  • Contact: Songbing Zou

Abstract:

In the context of global climate change, the quantitative assessment of human activity's impact on the quality of the ecological environment is a key issue for regional ecological conservation and high-quality development. Based on the Analytic Hierarchy Process (AHP) method and GIS visualization and spatial analysis technology, we structured an ecological resilience assessment system including three criteria layers: social economy, land pressure and natural conditions, using ecosystem classification data meteorological data retrieved from remote sensing. Combining with the spatiotemporally nondimensionalized indicators and the synthetical index method, we quantitatively assessed the ecological resilience in Gannan and Linxia every five years from 2000 to 2020. The results show that the spatial scale ecological resilience thresholds of the study area are 0.14-0.65 (2000), 0.12-0.72 (2005), 0.07-0.70 (2010), 0.12-0.70 (2015), 0.28-0.82 (2020). The ecological resilience level in Gannan is relatively high, and the ecological resilience level in Linxia is relatively low. In the aspect of spatial distribution, the ecological resilience showed a decreasing trend with the latitude increased. The regions with high ecological resilience are dominated by grassland, forest and shrub ecosystems, and the regions with high ecological resilience are dominated by farmland and urban ecosystems. In the aspect of time series, the ecosystem resilience is generally positive, showing an upward trend at first, then falling, and finally rising, affected by human activities and climate change.

Key words: water conservation area, ecological resilience, integrated assessment model, the upper reaches of the Yellow River

CLC Number: