安徽省淮北小麦-玉米全程机械化绿色丰产模式碳足迹研究

基于安徽省淮北平原粮食丰产科技工程示范区农户调研数据,探明小麦-玉米连作种植模式的主要碳排放环节,为实现该模式低碳农业提供理论依据。运用农业碳足迹理论,依据生命周期法,分析集成的小麦-玉米创新模式与传统模式单位面积碳足迹及构成、单位产量碳足迹,并分析创新模式碳足迹与种植规模关系。结果显示：单位面积碳足迹传统模式高于创新模式2.11%,达到2159.50 kg(CO₂-eq)/hm²;无论是创新模式还是传统模式,单位面积碳足迹贡献序是一致的,为化肥>N₂O>柴油>种子>电力>农药;单位产量碳足迹传统模式高出创新模式25.18%,达到0.1402 kg(CO₂-eq)/kg;创新模式单位面积碳足迹与种植规模构成显著负相关。说明创新种植模式具有一定的减排效果,化肥是影响模式碳排放的主要因素,种植规模影响碳排放。

The Carbon Footprint of the Mode of Wheat-Maize Full-Mechanized Green Harvest in Huaibei Plain of Anhui Province

The study revealed the carbon emission mechanism of the mode of wheat-maize continuous cropping, aiming to provide theoretical references for the low-carbon agriculture based on data from farmers’ survey in the demonstration region of science & technology project for food production in Huaibei Plain of Anhui Province. It analyzed the difference of carbon footprint per unit area and its components, and carbon footprint per unit output of farmland between innovative and traditional mode of wheat-maize continuous cropping with life-cycle approach (LCA), and found the relationship between the carbon footprint of innovative mode and cultivation scale. The results indicate that the value of carbon footprint of the traditional mode per unit area is 2159.50 kg(CO₂-eq)/hm², 2.11% higher than that of the innovative mode. The contribution sequence of carbon footprint of the two modes is consistent, in an order of: fertilizer>N₂O>diesel>seed>electricity>pesticide. The value of carbon footprint per unit output of the traditional mode is 0.1402 kg(CO₂-eq)/kg, 25.18% higher than that of the innovative mode. The value of carbon footprint of the innovative model per unit area is significantly and negatively correlated with the cultivation scale. In conclusion, the innovative mode has certain emission reduction, chemical fertilizer is the main influencing factor on the carbon emission of the mode, and the cultivation scale also has effect on carbon emission.