广西北海西村港红树林沉积物温室气体通量及其影响因素OA

Mangrove sediments are potential sources of greenhouse gases,including carbon dioxide(CO2),methane(CH4),and nitrous oxide(N2O).Investigating sediment greenhouse gas fluxes and their influencing factors helps to understand the role of mangroves in climate regulation.This study focused on the mangrove of Xicun Bay in Beihai,Guangxi to examine the spatiotemporal characteristics of sediment-atmosphere inter-face greenhouse gas fluxes and their environmental influencing factors.The results showed that the total global warming potential of the three greenhouse gases averaged 161.13 mg CO2e·m-2·h-1 in the Xicun Bay mangrove sediments(mean of two seasons),with CO2 contributing 86.5％.Overall,greenhouse gas flu-xes exhibited clear seasonal variations,with mangrove sediments acting as a net source of greenhouse gases in summer,while fluxes in winter were lower,representing a weak source or weak sink.Sediment temperature showed a significantly positive correlation with the fluxes of all three greenhouse gases,being the dominant factor driving seasonal variations in gas fluxes.CH4 flux was significantly negatively correlated with sediment redox potential.These findings enrich the background data on the greenhouse gas emission characteristics of mangrove sediments in the Beibu Gulf region.