Per unit area yield,carbon emissions,and spatial differences of freshwater aquaculture in the Yangtze River Economic Belt
Freshwater is an important resource in the Yangtze River Economic Belt.However,freshwater aquaculture causes the emission of methane and nitrous oxide,and excessive emissions can induce environmental pollution.In this study,a county-wide fishery database of the Yangtze River Economic Belt in 2019 was constructed based on the national and local fishery statistical yearbook,which was used to analyze the spatial and production differences of freshwater aquaculture.Here,a life cycle analysis method was employed to analyze the greenhouse gas(GHG)emission characteristics of the Yangtze River Economic Belt.Fishery database analysis revealed that aquaculture production was 6.9 t·hm-2 in the midstream,and 6.0 t·hm-2 downstream,of the Yangtze River Economic Belt in 2019.Due to the differences in the GHG emission factor,aquaculture production,and electricity consumption,there was a significant spatial difference in GHG emissions from freshwater aquaculture systems.In the Yangtze River Economic Belt,the total greenhouse gas emissions from freshwater aquaculture amount to 1.5×107 t CO2e equivalent.Among these,extensive and semi-intensive aquaculture system contribute the highest emissions,accounting for approximately 66.8%of the total emissions,while intensive aquaculture system contribute the least,constituting around 4.5%of the total emissions.Therefore,enhancing green aquaculture system and mitigating greenhouse gas emissions are critical pathways to achieve sustainable development in freshwater aquaculture system within the Yangtze River Economic Belt.
the Yangtze River Economic Beltfreshwater aquaculturegreenhouse gas(GHG)aquaculture modespatial characteristics
万方数据
维普
