Aquaculture ponds have emerged as a significant contributor to greenhouse gas(GHG)emissions.We measured methane(CH_(4)),carbon dioxide(CO_(2)),and nitrous oxide(N_(2)O)emissions in ponds,all located in Jiangsu Provinc...Aquaculture ponds have emerged as a significant contributor to greenhouse gas(GHG)emissions.We measured methane(CH_(4)),carbon dioxide(CO_(2)),and nitrous oxide(N_(2)O)emissions in ponds,all located in Jiangsu Province,with different fish and management practices over an entire cycle.All ponds emitted these gases,with higher CH_(4) and N_(2)O levels during fish growth than stocking period.The highest CH_(4) and N_(2)O fluxes were found in the Crucian carp(Carassius auratus)pond with up to 16,512±3015μmol/(m^(2)·h)and 5.54±0.31μmol/(m^(2)·h),respectively.CH_(4) was the primary contributor to the global warming potential in traditional earthen ponds,accounting for an average contribution rate of 87.7%.The dissolved oxygen(DO)concentration was the water quality parameter that most significantly influenced the CO_(2)flux,while pH acted as its primary regulator.The GHG emission intensity per unit of fish production in traditional earthen ponds was 197 times higher than that in-pond raceway systems.Largemouth bass(Micropterus salmoides)and Crucian carp ponds exhibited CH_(4) diffusion fluxes at the sediment-water interface,which were>20 times higher than those at the water-air interface.Our results further suggest that stocking density and feed amount significantly influence the variations in GHG emissions among the ponds with the in-pond raceway system having low carbon emissions and being high yield aquaculture system compared to traditional earthen ponds.The water depth and DO concentration can be manipulated to reduce GHG emissions across the various interfaces.展开更多
基金supported by the National Key Research and Development Program of China(No.SQ2024YFE0102696)the Provincial Science and Technology Innovative Program for Carbon Peak and Carbon Neutrality of Jiangsu of China(No.BE2022422)supported by the TÜBITAK program BIDEB2232(No.118C250).
文摘Aquaculture ponds have emerged as a significant contributor to greenhouse gas(GHG)emissions.We measured methane(CH_(4)),carbon dioxide(CO_(2)),and nitrous oxide(N_(2)O)emissions in ponds,all located in Jiangsu Province,with different fish and management practices over an entire cycle.All ponds emitted these gases,with higher CH_(4) and N_(2)O levels during fish growth than stocking period.The highest CH_(4) and N_(2)O fluxes were found in the Crucian carp(Carassius auratus)pond with up to 16,512±3015μmol/(m^(2)·h)and 5.54±0.31μmol/(m^(2)·h),respectively.CH_(4) was the primary contributor to the global warming potential in traditional earthen ponds,accounting for an average contribution rate of 87.7%.The dissolved oxygen(DO)concentration was the water quality parameter that most significantly influenced the CO_(2)flux,while pH acted as its primary regulator.The GHG emission intensity per unit of fish production in traditional earthen ponds was 197 times higher than that in-pond raceway systems.Largemouth bass(Micropterus salmoides)and Crucian carp ponds exhibited CH_(4) diffusion fluxes at the sediment-water interface,which were>20 times higher than those at the water-air interface.Our results further suggest that stocking density and feed amount significantly influence the variations in GHG emissions among the ponds with the in-pond raceway system having low carbon emissions and being high yield aquaculture system compared to traditional earthen ponds.The water depth and DO concentration can be manipulated to reduce GHG emissions across the various interfaces.
