Natural infrastructure in sustaining global urban freshwater ecosystem services
Natural infrastructure in sustaining global urban freshwater ecosystem services
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DOI：
10.1038/s41893-021-00786-4
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发表时间：
2021-10-21
影响因子：
27.6
通讯作者：
Liu, Jianguo
中科院分区：
文献类型：
--
作者：
Chung, Min Gon;Frank, Kenneth A.;Liu, Jianguo
为城市提供淡水的生态系统也会影响沉积物流动、洪水缓解和水电供应。这篇文章着眼于全球300多个城市，以衡量自然生态系统与已建基础设施之间的相互作用。地球仪的快速城市化增加了对淡水和与之相关的生态系统服务的需求。这一需求通常通过基础设施的建设来满足。为提供淡水生态系统服务，自然基础设施解决方案有所增加，但很少有全球性研究探讨为地球仪城市提供淡水生态系统服务的建筑基础设施与自然基础设施之间的复杂关系。利用网络分析，我们研究了全球317个城市的2,113个流域的建筑和自然基础设施之间的相互关系，重点关注四个关键的淡水生态系统服务：淡水供应，沉积物调节，洪水缓解和水电生产。我们的研究结果表明，保护湿地有助于维持城市淡水供应。保护区内的森林覆盖可以提高大型水坝减少沉积物负荷和产生水力的能力，但城市主要依靠减少不透水面和城市地区内更多的绿色空间来减轻洪水。必须加强对自然基础设施在城市水网络中的作用的理解，以支持战略决策，从而为全球城市可持续地提供淡水生态系统服务。
Ecosystems that provide fresh water for cities also impact sediment flows, flood mitigation and hydropower provision. This Article looks at over 300 cities globally to gauge the interactions of natural ecosystems with built infrastructure.Rapid urbanization throughout the globe increases demand for fresh water and the ecosystem services associated with it. This need is conventionally met through the construction of infrastructure. Natural infrastructure solutions have increased to provide freshwater ecosystem services, but little global research has examined the intricate relationships between built and natural infrastructure for providing freshwater ecosystem services to cities across the globe. Using network analysis, here we examine the interrelationships between built and natural infrastructure in 2,113 watersheds for 317 cities worldwide, focusing on four key freshwater ecosystem services: freshwater provision, sediment regulation, flood mitigation and hydropower production. Our results indicate that protected wetlands contribute to sustaining freshwater provision to cities. Forest cover in protected areas can improve the capacity of large dams in reducing sediment loads and producing hydropower, but cities mainly depend on reduced impervious surfaces and more green spaces within urban areas for flood mitigation. Improved understandings of the role of natural infrastructure in urban water networks must underpin strategic decision-making to sustainably provide freshwater ecosystem services to global cities.