迈向中国低碳大米生产:历史变化,驱动因素和缓解潜力
Shuai Li1, Hongwei Lu2, Xiaodong Li1
1College of Environmental Science and Engineering, Hunan University, Changsha 410082, P. R. China.
Environmental science & technology
|March 19, 2024
概括
中国的米生产显示了农场碳足迹 (CF) 的增加. 优化灌和生物气生产等有针对性的战略可以显著减少温室气体 (GHG) 排放,提高产量.
科学领域:
- 农业科学 农业科学
- 环境科学 环境科学
- 气候变化研究 气候变化研究
背景情况:
- 实现低碳农业对于满足这些需求至关重要.
- 双碳二氧化碳的使用方法
- 目标,需要详细了解农业温室气体 (GHG) 排放.
- 缺乏对温室气体排放的细度,系统的评估,阻碍了在作物生产中的局部减缓策略.
研究的目的:
- 分析2007年至2018年中国大米生产的县级碳足迹 (CF).
- 确定驱动大米生产CF的时空空间变化的关键因素.
- 评估各种策略的潜力,以减轻温室气体排放和提高大米产量.
主要方法:
- 生命周期评估 (LCA) 与DNDC (脱-分解) 模型的结合,用于县级分析.
- 2007年至2018年农场碳足迹 (FCF) 和产品碳足迹 (PCF) 的分析.
- 场景分析,以评估优化灌,草基生物气和其他农业实践对温室气体排放和产量的影响.
主要成果:
- 平均基于农场的CF (FCF) 每年显著增加74.3公斤CO2-eq ha-1,而基于产品的CF (PCF) 保持稳定.
- 在2018年观察到FCF (232420,768公斤CO2-eq ha-1) 和PCF (0.363.81公斤CO2-eq kg-1) 的县级变化相当大.
- 现场的CH4排放,柴油消耗和土壤有机碳封存是FCF异质性的主要驱动因素.
结论:
- 优化灌和基于草的生物气体生产可以大幅减少温室气体排放 (分别为48.5%和18.0%).
- 综合战略,包括先进的作物管理和施肥,可以实现高达76.7%的排放减少,同时提高产量11.8%.
- 在米生产中制定有针对性的温室气体减排政策,以支持碳中和农业,县级的洞察力至关重要.
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