Effects of gradually elevated CO2 concentration on N2O emission from winter wheat field
In order to study the effects of gradually elevated CO2 concentration on N2O emission from winter wheat field,a field experiment was carried out with Yangmai 22 as the test material by using an open-top chamber(OTC).Using at-mospheric CO2 concentration as the control(CK),and two gradually elevated CO2 concentration treatments,C80(CO2 concen-tration increased by 80 μmol/mol)and C120(CO2 concentration increased by 120 μmol/mol),were set.The results showed that the seasonal variation of N2O emission flux in wheat field was not changed by the slow increase of CO2 concentration.Dur-ing 2017-2018 winter wheat growing season,the cumulative N2O emissions from soil in CK and C80 treatment were(25.49±3.33)mg/m2and(26.83±3.21)mg/m2,respectively.During 2018-2019 winter wheat growing season,the accumulative N2O emissions in CK and C120 treatment were(113.06±2.66)mg/m2 and(121.20±9.28)mg/m2,respectively.During 2017-2018 winter wheat growing season,the cumulative N2O emissions from the soil-winter wheat system in CK and C80 treatment were(25.99±1.39)mg/m2 and(29.83±4.20)mg/m2,re-spectively.The cumulative N2O emission from soil was posi-tively correlated with the aboveground biomass of winter wheat(P＜0.01),and the cumulative N2O emission from soil-winter wheat system was positively correlated with the aboveground biomass of winter wheat(P＜0.01).
winter wheatN2 O emissionsopen top chambergradually elevated CO2 concentration
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