再生水对城市水生态系统服务价值贡献研究OA

To alleviate water scarcity in arid cities in northwest China and leverage the critical substitu-tion role of reclaimed water,this study takes Xi'an as a case study.Valuation methods such as the mar-ket value method and the replacement cost method were used to assess the water ecosystem services value(WESV)from 2005 to 2022.A trade-off and synergy degree model was introduced to analyze the role of reclaimed water in enhancing WESV and optimizing inter-service relationships.The results show that the total WESV of Xi'an City increased from 21.27 billion to 48.56 billion CNY with fluctuations from 2005 to 2022,and it was predominantly composed of regulating services and cultural services.From 2020 to 2022,the contribution rate of reclaimed water to the total WESV continued to increase,exhibiting signifi-cant variations across different services,with the greatest contribution made to ecological water use.Inter-relationships between water ecosystem services were primarily characterized by trade-offs.Reclaimed wa-ter use effectively promoted a shift in the relationships between multiple services from trade-offs to syner-gies,particularly the relationships between water conservation and other services.To foster the sustained growth of WESV and achieve synergistic gains in water ecosystem services,we suggest expanding the scale of reclaimed water use and optimizing its allocation strategies.