Zheng Pengxiang, Chen Guangcheng, Lan Wenlu, Li Shiman, Li Mingmin, Chen Shunyang, An Wenshuo, Chen Jiahui, Yu Shuo, Chen Bin
Shanghai Ocean University, Shanghai, China; Third Institute of Oceanography, Ministry of Natural Resources, Xiamen, China.
Shanghai Ocean University, Shanghai, China; Third Institute of Oceanography, Ministry of Natural Resources, Xiamen, China; Observation and Research Station of Coastal Wetland Ecosystem in Beibu Gulf, Ministry of Natural Resources, Beihai, China.
Mar Pollut Bull. 2023 Mar;188:114676. doi: 10.1016/j.marpolbul.2023.114676. Epub 2023 Feb 8.
Atmospheric greenhouse gas (GHG) emissions from seagrass meadows that determine the ecosystem atmospheric cooling effect have rarely been quantified. This study measured the simultaneous fluxes direct to the atmosphere of three GHGs (CO, CH and NO) within a Halophila beccarii seagrass meadow and an adjacent unvegetated bare intertidal flat, and their relationships to seagrass abundance and relevant soil parameters. The results showed that seasonal variation in seagrass abundance was strongly linked with the CO exchange rate. The CH and NO fluxes were similarly low at both sites and comparable between winter and summer. The global warming potential of CH and NO reduced the ecosystem CO uptake by only 5 % at the seagrass site. The results indicated that the H. beccarii meadow had a stronger atmospheric cooling effect than the bare flat and that the seagrass-mediated CO flux in this oligotrophic seagrass meadow primarily determined the atmospheric cooling effect.
决定生态系统大气冷却效应的海草草甸的大气温室气体（GHG）排放很少被量化。本研究测量了贝克氏盐沼草海草草甸和相邻的无植被潮间带裸滩中三种温室气体（CO、CH和NO）直接向大气的同步通量，以及它们与海草丰度和相关土壤参数的关系。结果表明，海草丰度的季节变化与CO交换率密切相关。两个地点的CH和NO通量同样较低，且冬季和夏季相当。CH和NO的全球变暖潜能值仅使海草生长地的生态系统CO吸收量减少了5%。结果表明，贝克氏盐沼草草甸比裸滩具有更强的大气冷却效应，并且在这个贫营养海草草甸中，海草介导的CO通量主要决定了大气冷却效应。
