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Global blue carbon accumulation in tidal wetlands increases with climate change

National Science Review 2021年第9期8卷 145-155页

作者： Faming Wang christian J.Sanders Isaac R.Santos Jianwu Tang Mark Schuerch Matthew L.Kirwan Robert E.Kopp Kai Zhu Xiuzhen Li Jiacan Yuan Wenzhi Liu Zhian Li Department of Environmental Studies University of California Department of Atmospheric and Oceanic Sciences Fudan University cAS Key Laboratory of Aquatic Botany and Watershed Ecology Wuhan Botanical GardenChinese Academy of Sciences Xiaoliang Research Station for Tropical coastal Ecosystems Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems and the CAS Engineering Laboratory for Ecological Restoration of Island and Coastal Ecosystems South China Botanical Garden Chinese Academy of Sciences center of Plant Ecology Core Botanical Gardens Chinese Academy of Sciences Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) State Key Laboratory of Estuarine and coastal Research and Institute of Eco-chongming East China Normal University National Marine Science centre School of Environment Science and Engineering Southern Cross University Department of Marine Sciences University of Gothenburg Lincoln centre for Water and Planetary Health School of Geography University of Lincoln Virginia Institute of Marine Science College of William and Mary Department of Earth and Planetary Sciences and Rutgers Institute of Earth Ocean and Atmospheric Sciences Rutgers University

coastal tidal wetlands produce and accumulate significant amounts of organic carbon(c) that help to mitigate climate change. However, previous data limitations have prevented a robust evaluation of the global rates and mechanisms driving c accumulation. Here, we go beyond recent soil c stock estimates to reveal global tidal wetland c accumulation and predict changes under relative sea level rise, temperature and precipitation. We use data from literature study sites and our new observations spanning wide latitudinal gradients and 20 countries. Globally, tidal wetlands accumulate 53.65(95%cI: 48.52–59.01)Tg c yr-1, which is ～30% of the organic c buried on the ocean floor. Modeling based on current climatic drivers and under projected emissions scenarios revealed a net increase in the global c accumulation by2100. This rapid increase is driven by sea level rise in tidal marshes, and higher temperature and precipitation in mangroves. countries with large areas of coastal wetlands, like Indonesia and Mexico, are more susceptible to tidal wetland c losses under climate change, while regions such as Australia, Brazil, the USA and china will experience a significant c accumulation increase under all projected scenarios.

关键词： coastal wetlands blue c c burial rate global change

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