GEOGRAPHY

Progress has been made in the research on carbon storage and carbon emission mechanisms of different types of mangroves


The team of Academician Yang Zhifeng of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) (hereinafter referred to as Guangzhou Ocean Laboratory), together with researchers from Guangdong University of Technology and Hong Kong Chinese University, has made new progress in the research of carbon storage and carbon emission mechanisms of different types of mangroves. Recently, the relevant results were published in Holistic Environmental Science.

Components of carbon storage in different types of mangrove sediments and key drivers of mangrove carbon emissions. Photo courtesy of the research team

Ouyang Xiaoguang, the first author and corresponding author of the paper and a distinguished researcher at Guangzhou Marine Laboratory, said that mangroves can efficiently capture carbon from the air and bury it in sediments for millions of years, but due to the lack of data on different components of carbon sources and sinks, the fate of mangrove carbon has not been well clarified.

This study investigates the carbon storage and carbon emissions of different interfaces of oceanic, natural and restored estuarine mangroves in Hong Kong through field experiments, reveals the key drivers of carbon emissions at the water-gas interface and the soil-gas interface, and clarifies the methane emission pathways of different types of mangroves through gas isotope technology. The results suggest that high pollutant loads in estuarine mangroves restored in ponds promote methane production.

The results found that sediment carbon storage was the highest in the restored estuarine mangrove forest, followed by natural estuarine mangrove forest, and the sediment carbon storage in marine mangrove forest was the lowest, and sediment organic carbon storage and inorganic carbon storage accounted for 84.1-90.2% and 9.8-15.9% of the total sediment carbon storage, respectively. The carbon emissions in the restored estuarine mangroves and the natural estuarine mangroves affected by the sewage of aquaculture ponds were higher than those in the marine mangroves; the methane production in the restored estuarine mangroves mainly came from the fermentation of acetate, while the methane production in the natural estuarine mangroves and marine mangroves mainly came from the reduction of carbonate.

The study highlights the need for more accurate projections of carbon sinks in mangroves by incorporating mangrove types and local conditions. (Source: China Science News, Zhu Hanbin, Wang Yue)

Related paper information:https://doi.org/10.1016/j.scitotenv.2023.167511



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