展望:乳制品料管理对土壤碳变化和净零核算的影响
Joshua D Gamble1, Jonathan Alexander1
1Plant Science Research Unit, USDA-ARS, Saint Paul, MN 55108.
Journal of dairy science
|March 5, 2025
概括
旨在实现净零排放的乳制品农场必须考虑玉米料生产导致的土壤碳损失. 包括这些排放量可以使牛奶的数量增加一倍.
科学领域:
- 农业科学 农业科学
- 环境科学 环境科学
- 土壤科学 土壤科学
背景情况:
- 美国乳制品行业的目标是到2050年实现净零温室气体 (GHG) 排放.
- 目前的做法严重依赖于玉米料,破坏了温室气体减排目标,因为土壤的碳损失很大.
- 玉米料生产造成的土壤碳损失往往被排除在碳足迹和生命周期库存之外.
研究的目的:
- 评估土壤碳损失对牛奶生产碳足迹的影响.
- 突出需要在乳制品料系统中准确的排放会计.
- 提出改善奶牛养殖中的土壤碳平衡的策略.
主要方法:
- 利用一个例子奶牛场来量化排放.
- 在碳足迹计算中纳入土壤碳损失的生物源排放.
- 分析了当前料生产系统的碳平衡.
主要成果:
- 包括土壤碳损失排放量在内,牛奶的计算碳足迹几乎翻了一番.
- 牛奶生产温室气体效率的过去收益可能是以牺牲土壤碳为代价.
- 玉米料占主导地位的旋转转移大大有助于净土壤碳损失.
结论:
- 精确的碳足迹需要考虑土壤碳动态.
- 实现净零排放需要改变除了便管理之外,包括料作物系统.
- 结合多年作物,培育性料和增强土壤碳保留等策略至关重要.
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