Gao, G.-F.; Zhang, X.-M.; Li, P.-F.; Simon, M.; Shen, Z.-J.; Chen, J.; Gao, C.-H., and Zheng, H.L., 2020. Examining soil carbon gas (CO₂, CH₄) emissions and the effect on functional microbial abundances in the Zhangjiang Estuary Mangrove Reserve. Journal of Coastal Research, 36(1), 54–62. Coconut Creek (Florida), ISSN 0749-0208.

Mangrove soil is regarded as an important source of CO₂ and CH₄ because of its large carbon pools. However, little is known about the magnitudes of CO₂ and CH₄ emitted from mangrove soils and their relationships with functional microbial abundances. Here, a field experiment was conducted in Zhangjiang Estuary Mangrove from August 2014 to September 2016. Soils dominated by species Kandelia obovata (KO), Avicennia marina (AM), and bare mudflat (Mud) were randomly established, respectively. The results showed that soil of the Zhangjiang Estuary Mangrove wetland is a significant source of CH₄ (ranging from –35.36 to 2822.52 µg m^–2 h^–1) and CO₂ (ranging from –28.45 to 116.26 mg m^–2 h^–1), with a significant spatial and seasonal variation pattern. The soil CH₄ emissions were positively correlated to the mcrA gene abundance and organic matter content. Meanwhile, the 16S rRNA and ANME-pmoA gene abundances were positively correlated to the soil CO₂ emissions. When considering only the soil-atmosphere exchange of carbon gas, soil CO₂ emission was the major contributor to the global warming potential, accounting for 64.66%–96.11%. The profound variations of soil CH₄ and CO₂ emissions may imply the important role of dominant mangrove vegetation on soil microbes and carbon gas emissions.