657 / 2024-09-18 20:23:59
CO2 fluxes and dynamics in a tropical seagrass bed ecosystem in Southern China
Seagrass bed ecosystem, pCO2, CO2 fluxes, non-thermal factors
Session 29 - Advances and Challenges in Marine Carbon Dioxide Removal (mCDR)
Abstract Accepted
Min Zhang / State Key Laboratory of Marine Environmental Science, College of Marine and Earth Sciences, Xiamen University, Xiamen, China
Chunxue Tang / State Key Laboratory of Marine Environmental Science, College of Marine and Earth Sciences, Xiamen University, Xiamen, China
Tao Huang / State Key Laboratory of Marine Environmental Science, College of Marine and Earth Sciences, Xiamen University, Xiamen, China
Liguo Guo / State Key Laboratory of Marine Environmental Science, College of Marine and Earth Sciences, Xiamen University, Xiamen, China
Yi Xu / State Key Laboratory of Marine Environmental Science, College of Marine and Earth Sciences, Xiamen University, Xiamen
Yan Li / State Key Laboratory of Marine Environmental Science, College of Marine and Earth Sciences, Xiamen University, Xiamen
Yuan Shen / State Key Laboratory of Marine Environmental Science, College of Marine and Earth Sciences, Xiamen University, Xiamen
Xianghui Guo / State Key Laboratory of Marine Environmental Science, College of Marine and Earth Sciences, Xiamen University, Xiamen
Minhan Dai / State Key Laboratory of Marine Environmental Science, College of Marine and Earth Sciences, Xiamen University, Xiamen
Seagrass meadows is a typical coastal blue carbon ecosystem, is subject to complex biogeochemical processes. Depending on the aquatic environment, an ecosystem featuring seagrass beds can either a source or sink of atmospheric carbon dioxide (CO2). This study takes an ecosystem approach and investigates the spatial and temporal variations of surface seawater pCO2 (partial pressure of CO2) in a shallow and semi-enclosed wetland system featuring seagrass beds (primarily Enhalus acoroides) located in the Li’an Port of Hainan Island. There were significant diurnal variations in surface water FCO2 (CO2 fluxes) and during our surveys in different seasons, spring is carbon weak carbon sink and summer and fall are weak carbon source in the Enhalus acoroides dominated ecosystem. With a semi-analytical framework by assessing the consumption of dissolved inorganic carbon relative to nutrients, we analyzed the influence of different processes on pCO2 in the seagrass bed ecosystems under study. We reveal that temperature was not a major driver of the pCO2 variability in the seagrass ecosystem, and its inter-seasonal changes are substantially regulated by non-thermal factors such as water mass mixing, net primary production and net primary calcification.