Cumulative Effects of Microplastics on Soil CO2 Emissions
Using the controlled planting body—large-scale root chamber experimental device(hereinafter referred to as root chamber)as the research platform,the characteristics of soil respiration changes under different types of microplastic treatment were analyzed by continuously planting two crops each year for three years.A multiple regression equation was employed to model the temporal variations in soil CO2 concen-tration under varying conditions,including microplastic accumulation and molecular weight,with the results visually presented.The result showed that the regression models effectively described the patterns of soil CO2 concentration changes,with all models showing R2 exceeding 0.75,indicating good simulation performance.A significant analysis of variance on the pre-and post-treatment data yielded a P-value of 0.0073.Compared to the control group's CO2 concentration increase rate(ω=0.728),the presence of microplastics significantly enhanced the soil CO2 concentration increase rate(ω=0.762).The introduction of microplastics altered the microclimate of the soil environment,signifi-cantly promoting CO2 emissions from the soil.
MicroplasticsSoil CO2 emissionCumulative effectMultiple regression
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