Seasonal and spatial pattern of greenhouse gas concentration and emission flux in small water body of wetland park
This study selected Shenzhen Baguang wetland park as the study area.A one-year sampling program was conducted within three types of water bodies,i.e.,ditches,ponds and estuaries.Measured data were used to investigate the seasonal and spatial pattern of greenhouse gas and its driving factors in the typical small water body within highly urbanized area.The results showed that the average concentrations of dissolved CO2,CH4,and N2O in the water were(54.30±49.55),(0.89±1.45),and(0.0038±0.0007)μmol/L,respectively.The average fluxes of CO2,CH4,and N2O emission were(113.94±424.19),(1.48±3.84),and(0.0044±0.0176)mg/(m2·h),respectively,implying a source of greenhouse gas to atmosphere.The emission potential of CO2 from these small water bodies was much higher than coastal waters,lakes and other waters,and was the main contributor(85.57％)to the global warming within the entire wetland park water.From the perspective of spatial and temporal heterogeneity,greenhouse gas concentrations and fluxes showed a pattern of warm season(August)＞cool season(January,April,December),ditches＞ponds and estuaries,and were higher near the middle of the wetland park.Salinity,pH,ammonium nitrogen,nitrate,electrical conductivity,chemical oxygen demand,and total organic carbon were the critical environmental factors contributing to differences in dissolved greenhouse gas concentrations in the water.EC was the critical environmental factor influencing greenhouse gas fluxes.
small wetlandslandscape waterCO2CH4N2Oenvironmental factors
万方数据
维普
