Li Jinquan, Jiang Mingkai, Pei Junmin, Fang Changming, Li Bo, Nie Ming
Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary, Institute of Biodiversity Science and Institute of Eco-Chongming, School of Life Sciences, Fudan University, Shanghai, China.
College of Life Sciences, Zhejiang University, Hangzhou, China.
Ecol Lett. 2023 May;26(5):797-804. doi: 10.1111/ele.14199. Epub 2023 Mar 15.
Wetlands are strategic areas for carbon uptake, but accurate assessments of their sequestration ability are limited by the uncertainty and variability in their carbon balances. Based on 2385 observations of annual net ecosystem production from global wetlands, we show that the mean net carbon sinks of inland wetlands, peatlands and coastal wetlands are 0.57, 0.29 and 1.88 tons of carbon per hectare per year, respectively, with a mean value of 0.57 tons of carbon per hectare per year weighted by the distribution area of different wetland types. Carbon sinks are mainly in Asia and North America. Within and across wetland types, we find that water table depth (WTD) exerts greater control than climate- and ecosystem-related variables, and an increase in WTD results in a stronger carbon sink. Our results highlight an urgent need to sustain wetland hydrology under global change; otherwise, wetlands are at high risk of becoming carbon sources to the atmosphere.
湿地是碳吸收的战略区域，但其固碳能力的准确评估受到碳平衡不确定性和变异性的限制。基于对全球湿地年净生态系统生产的2385次观测，我们发现内陆湿地、泥炭地和沿海湿地的平均净碳汇分别为每年每公顷0.57吨、0.29吨和1.88吨碳，以不同湿地类型的分布面积加权后，平均值为每年每公顷0.57吨碳。碳汇主要集中在亚洲和北美洲。在湿地类型内部和之间，我们发现地下水位深度（WTD）比气候和生态系统相关变量发挥着更大的控制作用，地下水位深度增加会导致更强的碳汇。我们的研究结果凸显了在全球变化背景下维持湿地水文的迫切需求；否则，湿地极有可能成为大气的碳源。
