Arid Zone Research ›› 2022, Vol. 39 ›› Issue (5): 1555-1563.doi: 10.13866/j.azr.2022.05.20

• Land and Water Resources • Previous Articles     Next Articles

Water ecological security influence factor and driving mechanism research in Shiyang River Basin

DAI Wenyuan1(),GUO Wu1(),ZHENG Zhixiang2,CHEN Yichen1,ZHANG Rui3,XU Yong1   

  1. 1. Environmental Law College,Gansu University of Political Science and Law, Lanzhou 730070, Gansu, China
    2. Key Laboratory of Evidence Science Techniques Research and Application, Gansu Province, Lanzhou 730070, Gansu, China
    3. College of Water Conservancy and Hydropower Engineering, Gansu Agricultural University,Lanzhou 730070, Gansu, China
  • Received:2022-02-02 Revised:2022-06-23 Online:2022-09-15 Published:2022-10-25
  • Contact: Wu GUO E-mail:13993181879@163.com;guowu_el@hotmail.com

Abstract:

The water ecological security evaluation index system was constructed based on the complex ecosystem (social-economic-compound ecological system and pressure-state-response model) concept. From 2009 to 2018, the statistical data of Shiyang River Basin were used. The fuzzy system analysis method and BP neural network model were used to analyze the many aspects of the driving mechanism of water ecological security in the Shiyang River Basin. The results showed that the precipitation change, livestock, ratio of ecological environment water consumption per unit area to total water use, rainwater utilization, and diameter fouling were the main influencing factors of water ecological security in the river basin during the study period. From the W-SENCE system view, the current influence degree of water ecological security were ranked as follows: resources subsystem≥social subsystem>economic subsystem>environment subsystem>ecological subsystem; from the PSR system view: response subsystem>pressure subsystem>status subsystem; the resources and pressure subsystems were the main driving force of water ecological security from 2009 to 2018. The pressure and environment subsystems were the main driving force of water ecological security from 2019 to 2023. In the last ten years, water ecological security of the Shiyang River Basin was still in the levelⅠarea (poor) and levelⅡ area (in general). Overall, the situation was poor.

Key words: compound ecosystem, fuzzy system analysis, BP neural network, water ecological security, Shiyang River Basin