廉州湾贝克喜盐草海草床夏季温室气体通量及其影响因素OA

To explore the regulatory effect of intertidal seagrass bed on climate change,this study employed the static chamber technique to measure the fluxes of three greenhouse gases(CO2,CH4,and N2O)within Halophila beccarii seagrass bed and an adjacent unvegetated intertidal bare flat,and tested their relationships with seagrass vegetation parameters and soil parameters.The results showed that both N2O and CH4 fluxes were comparable between the two sites.While the CO2 flux was related to the light condition,the seagrass bed showed a stronger CO2 sink or source under light or dark conditions than the bare flat.Seagrass shoot density,leaf density,and biomass showed stronger influences on greenhouse gas fluxes than soil parameters,and these seagrass vegetation parameters had significantly positive correlations with the dark flux of CO2.The global warming potential of the greenhouse gas fluxes was-55.67 and-17.30 mg CO2e·m-2·h-1 at the seagrass bed and bare flat,respectively.Overall,seagrass vegetation is the main factor affecting the CO2 flux at the seagrass bed and atmosphere interface,and further affects the intensity of seagrass beds in mitiga-ting atmospheric warming effects.