为揭示中华绒螯蟹(Eriocheir sinensis)养殖池塘晒塘阶段的 CO2 排放变化规律,以江苏宿迁中华绒螯蟹养殖池塘为研究对象,使用土壤碳通量测量仪器对池塘 2023 年 12 月中下旬至翌年 3 月初晒塘期的CO2 排放通量进行了监测分析.结果显示,晒塘 1 周、1 个月和 2 个月的池塘底质CO2 日排放通量平均值分别为(1214±633)mg/(m2·d)、(1055±422)mg/(m2·d)和(407±93)mg/(m2·d),且均表现为昼高夜低的规律,随着晒塘时间延长,昼夜排放通量差距逐渐减小.中华绒螯蟹养殖池塘在晒塘阶段表现为 CO2 的排放源,其沉积物-大气界面的 CO2 排放通量平均值为(1040±647)mg/(m2·d).土壤温度和土壤孔隙度是影响沉积物-大气界面 CO2 排放通量的主要环境因子,晒塘阶段CO2 累积排放量为 89.3 g/m2.
Characterization of CO2 emission fluxes during the sunning stage of Chinese mitten crab(Eriocheir sinensis)aquaculture ponds
Before culturing adult Chinese mitten crabs(Eriocheir sinensis),aquaculture ponds are sun-dried to enhance the bottom environment for the next cultivation stage.However,during the sunning stage,the sediment in these ponds may release significant amounts of CO2 into the atmosphere.We focused on E.sinensis aquaculture ponds in Suqian,Jiangsu Province,using soil carbon flux measurement instruments to monitor and analyze CO2 emission fluxes over two and a half months,from mid-December 2023 to early March 2024.Continuous monitoring was conducted both day and night to determine CO2 emission fluxes throughout the sunning stage.CO2 emission fluxes were measured three times a day and night on December 19,2023,January 24,2024,and February 28,2024.Each monitoring session began at 8:00 AM and continued every three hours.Additional measurements were taken on December 14,2023,December 24,2023,January 4,2024,January 14,2024,January 24,2024,February 3,2024,February 13,2024,February 23,2024,and March 4,2024,between 8:00-10:00 AM.Simultaneous meteorological and soil indicators were measured to analyze environmental factors affecting CO2 emission fluxes.Results showed that the average daily CO2 emission fluxes from the pond bottom after one week,one month,and two months of sunning were(1214±633)mg/(m2·d),(1055±422)mg/(m2·d),and(407±93)mg/(m2·d),respectively.Emission fluxes peaked in the afternoon and were lowest in the early morning.A diurnal pattern was observed,with higher emission fluxes during the day and lower at night.As sunning time extended,the day-night difference in emission fluxes gradually decreased,though a significant difference persisted.The range of CO2 emission fluxes at the sediment-atmosphere interface during the sunning stage was 351-2331 mg/(m2·d),with an average of(1040±647)mg/(m2·d).The CO2 emission fluxes showed a trend of initial increase followed by a decrease,indicating that the entire sunning stage was a source of CO2 emissions.Stepwise regression analysis identified soil temperature and soil porosity as the primary environmental factors influencing CO2 emission fluxes.A significant positive correlation was found between soil temperature and CO2 emission fluxes,while soil porosity was negatively correlated due to the effects of soil moisture and thermal conditions.Cumulative CO2 emissions increased gradually,although the growth rate slowed over time,with total cumulative CO2 emission fluxes during the sunning stage calculated at 89.3 g/m2.In this study,we reveal the changes in CO2 emission fluxes during the sunning stage of E.sinensis aquaculture ponds,highlighting these ponds as significant CO2 emission sources during this period.There is substantial potential for CO2 reduction in the E.sinensis aquaculture industry.The data provided by this study support efforts to reduce greenhouse gas emissions and develop corresponding emission reduction strategies in E.sinensis aquaculture ponds.
Chinese mitten crab aquaculture pondssunning stagesediment-atmosphere interfaceCO2 emission fluxCO2 cumulative emission
国家科技期刊平台
NSTL
万方数据
