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Journal of Desert Research ›› 2021, Vol. 41 ›› Issue (2): 164-172.DOI: 10.7522/j.issn.1000-694X.2020.00107

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Comprehensive assessment of ecosystem vulnerability, the value of service function and risk in Kezi River Basin in 2000-2018

Li Li1(), Qingqing Zhang1(), Yamei Wang1, Hong Li1, Xinfeng Zhao2   

  1. 1.College of Grass Industry and Environmental Science,Xinjiang Agricultural University,Urumqi 830054,China
    2.Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China
  • Received:2020-07-19 Revised:2020-09-30 Online:2021-03-20 Published:2021-03-26
  • Contact: Qingqing Zhang

Abstract:

Under the continuous increase of the intensity of human activities, finding out the current situation of regional ecological environment quality may provide scientific and technical support for regional ecological risk prevention. Based on the remote sensing image data of 2000, 2010 and 2018, this study uses principal component analysis, ecological service function value and ecological risk model to explore the temporal and spatial differentiation characteristics of ecological vulnerability, service function value and risk in Kezi River basin. The results show that: (1) the seriously vulnerable area of the Kezi River basin shows an obvious growth trend, with an increase of 204.78% in 18 years; its spatial distribution is the middle reaches, the lower reaches and the upper reaches from high to low. (2) the functional value of ecosystem services decreased by 65.20% in 18 years. Among them, the natural forest and grass, as the main contributor to ecological services, also significantly decreased by 43.05%; the spatial distribution of the functional value of ecological services showed a decreasing trend from west to east, from oasis to desert. (3) the spatial distribution of ecological risk from high to low is the middle reaches, the lower reaches and the upper reaches of the basin, respectively; the area of the high risk area of the basin has increased by 112.48% in the past 18 years, and the overall distribution has changed from low risk to about 50% of low risk and 50% of medium and high risk, indicating that the ecological environment of the basin has been seriously damaged.

Key words: watershed ecosystem, ecological vulnerability, functional value of ecosystem services, ecological risk assessment

CLC Number: