Greenhouse gases emissions from pond culture ecosystem of Chinese mitten crab and their comprehensive global warming potentials in summer

Abstract

In order to analyze the seasonal variation characteristics of emissions of CO2,CH4,N2O and evaluate the comprehensive global warming potentials(GWPs),fluxes of CO2,CH4 and N2O were measured simultaneously from the culture ponds of Chinese mitten crabs(Eriocheir sinensis)by the closed static opaque chamber-GC techniques.The results showed that the pond ecosystem was the sources of CO2 and CH4 in summer.The total emission of CO2 and CH4 came up to(42.62±9.55)-(95.09±10.89)g/m2 (6.91±2.18)-(12.52±3.11)g/m2 in summer.There was significantly lower emission of CO2/CH4 from the water with aquatic plants than the one without.Compared with the waters without aquatic plants,the aquatic plants can effectively decrease and control the emissions by 52.47 g/m2 of CO2 and 5.61 g/m2 of CH4.They are proved to reduce greenhouse gas emission significantly from culture ponds,but no significant effect on the emission of N2O with aquatic plants.It may decrease global warming potential by 1.85 times contrasted to that without aquatic plants.There may be great potential space of reducing greenhouse gases emission in pond culture of Chinese mitten crabs.