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The effects of nitrogen fertilizer application on methane and nitrous oxide emission/uptake in Chinese croplands
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2016
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Soil GasBiogeochemistryN2o EmissionsN2o EmissionNitrogen Fertilizer ApplicationEngineeringCrop ProductionChinese CroplandsAgricultural EconomicsN FertilizerNitrous Oxide Emission/uptakeSoil FertilityAgricultural EmissionsNutrient Management
200 kg N ha-1) as compared to no N fertilizer（control）.The response of CH4 uptake to N application in upland fields was 15%lower than control,with a mean CH4 uptake factor of-0.001 kg CH4-C kg-1 N.The mean N2O emission factors were 1.00 and 0.94%for maize（Zea mays） and wheat（Triticum aestivum）,respectively,but significantly lower for the rice（Oryza sativa）（0.51%）.Compared with controls,N addition overall increased global warming potential of CH4 and N2O emissions by 78%.Our result revealed that response of CH4 emission to N input might depend on the CH4concentration in rice paddy.The critical factors that affected CH4 uptake and N2O emission were N fertilizer application rate and the controls of CH4 uptake and N2O emission.The influences of application times,cropping systems and measurement frequency should all be considered when assessing CH4 and N2O emissions/uptake induced by N fertilizer.