Assessment of greenhouse gas emissions and carbon footprint associated with annual cultivation of winter wheat-summer corn‖summer peanut in farmland
To explore the impact of annual planting patterns of winter wheat summer corn and summer peanut on greenhouse gas emissions and carbon footprint in farmland,3 crop rotation planting methods were set up:winter wheat summer corn,winter wheat summer peanut,and winter wheat summer corn and summer peanut.Among them,the intercropping of summer corn and summer peanut was 3∶4(intercropped corn peanut row ratio of 3∶4),3∶6(in-tercropped corn peanut row ratio of 3∶6),and 6∶8(intercropped corn peanut row ratio of 6∶8),the annual green-house gas emissions and carbon footprint characteristics of farmland were studied through field experiments.Re-sults showed that the intercropping mode of summer corn and summer peanut could reduce greenhouse gas emis-sions in farmland,compared with corn monoculture,the average emission fluxes of soil CO2 and N2O decreased by 10.24%-18.75%and 10.78%-23.93%,respectively,and the total emission decreased by 8.30%-19.12%and 14.09%-26.81%,respectively.Intercropping reduced greenhouse gas emissions from subsequent winter wheat crops(under rotation mode),resulting in 3.79%decrease in soil CO2 emissions and 3.84%decrease in total emis-sions compared to corn monoculture treatment.Soil N2O emission flux decreased by 16.80%and the total emission decreased by 17.66%;the total amount of CH4 emissions from soil showed a"sink"phenomenon.In addition,the main source of carbon footprint in monoculture corn production was nitrogen fertilizer,accounting for 49.13%of the total emissions;the main sources of carbon footprint in monoculture peanut production were nitrogen fertilizer and plastic film,accounting for 23.77%and 26.06%of total emissions,respectively;the main sources of carbon footprint under intercropping mode were nitrogen fertilizer,diesel,and plastic film,accounting for 31.50%,16.74%,and 17.92%of the total emissions,respectively.The intercropping mode increased the carbon emission efficiency of sub-sequent wheat crops,reduced the global warming potential,and greenhouse gas emission intensity.In summary,the annual planting model of winter wheat summer corn and summer peanut(intercropped corn peanut row ratio of 3∶6)could reduce carbon emissions from farmland and carbon footprint in crop production,and was beneficial for ecolo-gy.
corn peanut intercroppinggreenhouse gas emissions from farmlandcarbon footprintglobal warming potential(GWP)
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