STUDY ON CARBON FOOTPRINT ACCOUNTING BY PROVINCES AND EMIS-SION REDUCTION STRATEGY OF POTATO IN CHINA——BASED ON LIFE CYCLE ASSESSMENT
This study aims to calculate the carbon footprint of potato,analyze its changing characteristics,and explore ways to reduce carbon emissions,so as to provide data support for the sequestration and reduction of carbon in agriculture and the achievement of peak and carbon neutral targets.This research used the Life Cycle Assessment(LCA)method to calculate the carbon footprint during the potato planting stage in China from 2011 to 2020,and analyzed the interannual changes in carbon emissions by province and composition of potato carbon emissions in various planting areas,then provided emission reduction technical suggestions for typical potato planting areas.The results showed that the total carbon emissions of potato at the provincial level in China showed a wavelike downward trend from 2011 to 2020.On the time scale,the carbon footprint per unit area of potato showed a significant upward trend,increasing at an average annual rate of 77.5 kg CO2eq/hm2(P＜0.01);the carbon footprint per unit yield showed a slow decreasing trend,with an average 10-year decrease of 0.129t CO2eq/t(P＜0.1).On the spatial scale,the carbon footprint per unit area of potato in the northern single crop zone and southwestern mixed crop zone were in a positive state of growth;carbon footprint per unit of production of potato were decreasing in most growing regions except Gansu and Xinjiang,having much room for potato emissions reduction.In the potato carbon footprint composition,chemical fertilizer(77.72％)was the main source of carbon emissions in the potato cultivation stage,followed by agricultural film(9.64％)and irrigation(8.46％).In summary,a comprehensive comparison of the carbon footprint of potato in various regions indicates that the southwestern mixed crop zone and the southern winter crop zone have the greatest potential for emission reduction,followed by the central double crop zone and the northern single crop zone,which shows that the focus of potato emission reduction gradually shifted south.And potato have achieved phased results in reducing emissions and increasing production,and there is still a lot of room for future development,of which fertilizer is the main starting point for potato emission reduction.Each growing region should develop carbon emission reduction plans that are suitable for their own characteristics,and vigorously promote advanced abatement technologies to achieve synergistic development of potato abatement and yield increase.
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