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Sci Rep:中国农大张伟峰研究组揭示中国粮食生产的碳足迹

摘要 : 2017年6月29日,国际学术权威刊物自然出版集团旗下子刊《Scientific Reports》杂志上在线发表了中国农业大学张伟峰研究组的一篇研究论文,研究估算了中国粮食生产的碳足迹。

2017年6月29日,国际学术权威刊物自然出版集团旗下子刊《Scientific Reports》杂志上在线发表了中国农业大学张伟峰研究组的一篇研究论文,研究估算了中国粮食生产的碳足迹。 不科学的粮食生产方式(包括盲目施肥、打药、灌溉与秸秆焚烧)增加了中国粮食生产有关的温室气体排放。

根据来自七个粮食主产区3240位农民的调查数据,张卫峰及同事计算了2013年中国玉米、小麦和水稻生产的碳足迹。作者发现,生产一千克玉米的碳足迹相当于0.48千克二氧化碳,小麦的碳足迹为0.75千克碳当量/千克(ce/kg),水稻则是1.6千克碳当量/千克。作者指出,这些数字高于美国、加拿大和印度的水平。他们发现,不科学施用氮肥、焚烧秸秆、大水漫灌用电和持续淹灌稻田的甲烷排放对碳排放的贡献最大,而作物秸秆还田、优化施用化学氮肥和免耕耕作方式是土壤固碳的主要措施。 作者提出,禁止焚烧秸秆、停止小麦和水稻生产中的漫灌做法等措施有望降低中国作物生产中的碳足迹。

原文链接:

Carbon footprint of grain production in China

原文摘要:

Due to the increasing environmental impact of food production, carbon footprint as an indicator can guide farmland management. This study established a method and estimated the carbon footprint of grain production in China based on life cycle analysis (LCA). The results showed that grain production has a high carbon footprint in 2013, i.e., 4052 kg ce/ha or 0.48 kg ce/kg for maize, 5455 kg ce/ha or 0.75 kg ce/kg for wheat and 11881 kg ce/ha or 1.60 kg ce/kg for rice. These footprints are higher than that of other countries, such as the United States, Canada and India. The most important factors governing carbon emissions were the application of nitrogen fertiliser (8–49%), straw burning (0–70%), energy consumption by machinery (6–40%), energy consumption for irrigation (0–44%) and CH4 emissions from rice paddies (15–73%). The most important carbon sequestration factors included returning of crop straw (41–90%), chemical nitrogen fertiliser application (10–59%) and no-till farming practices (0–10%). Different factors dominated in different crop systems in different regions. To identity site-specific key factors and take countermeasures could significantly lower carbon footprint, e.g., ban straw burning in northeast and south China, stopping continuous flooding irrigation in wheat and rice production system.

来源: Scientific Reports 浏览次数:0

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