Journal of Ecology and Rural Environment ›› 2022, Vol. 38 ›› Issue (8): 1051-1063.doi: 10.19741/j.issn.1673-4831.2021.0355

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Study on Freshwater Ecosystem Service Flow in Watersheds of Southeastern Fujian under Water Pollution Stress

CHEN Zi-long1, LIN Jing-yu1, HUANG Jin-liang1,2   

  1. 1. College of Environment & Ecology, Xiamen University, Xiamen 361102, China;
    2. Fujian Key Laboratory of Coastal Pollution Prevention & Control, Xiamen University, Xiamen 361102, China
  • Received:2021-06-03 Online:2022-08-25 Published:2022-08-23

Abstract: Although freshwater ecosystem service flow regarding supply and demand has attracted wide attentions, few studies have considered the influence of water quality regulation service on fresh water provision service flow. The watersheds of southeastern Fujian are disturbed by human activities and typical water scarcity have been caused by pollution. Based on supply-demand analysis, InVEST model and scenario analysis were used to quantify ecosystem services supply, demand, and flows within Huashan Creek Watershed in Pinghe County, where freshwater ecosystem services are strongly affected by the intensive agricultural activities. The interactions of freshwater provision services (water quantity) and regulation services (water quality, taking nitrogen pollution as example) and their impacts on freshwater ecosystem services flow were addressed both at watershed scale (i.e., the natural status) and political scale (i.e., the proposed status). The results show that (1) In the context of watershed scale, the ecosystem services flows were 4.59×108 m3, and decreased to 9.9×107 m3 under nitrogen pollution stress with the reduction rate of 78.43%, while the paths of flow were not affected. (2) In the context of political scale (i.e., the proposed status), the dynamic flows of freshwater ecosystem services were about 4.63×107 m3, and decreased to 4.02×107 m3 considering water regulation services, with a reduction of 13.17%. Water quality have changed the supply and demand of ecosystem services, and subsequently altered the path of flows, which switched Xiazhai County from supplier to beneficiary. The results of the study could be references to the researches on ecosystem services flows and provide guidelines for regional/local water resources management.

Key words: ecosystem services flow, InVEST model, scenario analysis, flow analysis

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