水质胁迫下闽东南地区流域淡水生态系统服务流研究

doi:10.19741/j.issn.1673-4831.2021.0355

摘要/Abstract

摘要： 淡水生态系统服务的空间流动和供需分析是当前生态系统服务研究的前沿热点。目前对于生态系统服务的流动路径研究鲜有报道,且已有研究较少考虑水质调节服务对于淡水供给服务流的影响。闽东南地区流域受人类活动扰动大,存在典型的水质型缺水问题。该研究选取福建省平和县花山溪流域作为研究区域,利用InVEST模型、情景设置、供需分析等方法,从子流域尺度和行政区(乡镇)尺度揭示水质胁迫(以氮为例)对淡水供给服务的影响,分别定量并可视化自然状态和供需平衡状态下淡水供给服务的供需情况和流动路径。结果表明:(1)基于子流域尺度的自然状态,累积盈余流量为4.59×10⁸ m³,在水质胁迫的情景下削减为9.9×10⁷ m³,削减率为78.43%,流向不受水质影响;(2)基于行政区尺度的供需平衡状态,动态服务流量为4.63×10⁷ m³,在水质胁迫情景下约为4.02×10⁷ m³,削减率为13.17%,水质影响下乡镇间水资源供需差异发生改变,故流向发生变化,霞寨镇从原先的相对供给区转变为相对受益区。该研究成果可为生态系统服务流的研究以及闽东南地区乡镇水资源管理提供一定的参考依据。

关键词: 生态系统服务流, InVEST模型, 情景分析, 流动分析

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

中图分类号:

陈梓隆, 林静玉, 黄金良. 水质胁迫下闽东南地区流域淡水生态系统服务流研究[J]. 生态与农村环境学报, 2022, 38(8): 1051-1063.

CHEN Zi-long, LIN Jing-yu, HUANG Jin-liang. Study on Freshwater Ecosystem Service Flow in Watersheds of Southeastern Fujian under Water Pollution Stress[J]. Journal of Ecology and Rural Environment, 2022, 38(8): 1051-1063.

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