农业管理的泥炭地排放氧化的来源
Yuqiao Wang1, Pierluigi Calanca1, Jens Leifeld1
1Agroscope, Climate and Agriculture Group, Zurich, Switzerland.
Global change biology
|January 26, 2024
概括
农业泥炭地释放出大量的氧化 (N2O),这是一个温室气体. 区分来自肥料和泥炭分解的排放是有效的缓解策略的关键,如重新湿和减少施肥.
科学领域:
- 环境科学 环境科学
- 农业科学 农业科学
- 气候科学 气候科学
背景情况:
- 排水和受肥的泥炭地是全球主要的氧化 (N2O) 来源.
- 了解肥料和泥炭分解对N2O排放的不同贡献,对于制定有针对性的减缓战略至关重要.
- 目前的缓解方法,如重新灌湿泥炭地和减少 (N) 肥料,显示出希望,但需要基于土地使用的差异化应用.
研究的目的:
- 在全球范围内推广农业管理的泥炭地N2O排放的分布.
- 区分N2O排放的来源,特别是区分肥料N和泥炭分解.
- 为了比较不同的缓解方案的有效性,包括减少肥料和泥炭地重新灌.
主要方法:
- 利用机器学习技术来分析全球N2 O的观测数据.
- 来自耕地和草原的量化N2O排放,区分来自肥料N的贡献.
- 从拟议的减排策略中计算了由肥料诱导的N2 O排放因子和模拟的排放减少.
主要成果:
- 农业耕地每年排放了401.0千N·1的N2O,其中121.6千N·1来自N.肥料.
- 农业草原每年排放64.0千克-1的N2O,其中仅有4.6千克-1来自N.肥料.
- 减少20%的肥料可以减少N2O排放量,在耕地减少10%,在草原减少3%;重新灌可比较的面积产生了类似的减少.
结论:
- 对经营的泥炭地进行缓解策略必须根据特定的土地使用类型和气候区域量身定制.
- 对于耕地,特别是热带地区,减少N肥料和重新湿泥炭地提供了显著的N2O缓解潜力.
- 对于草原来说,优先考虑阻止泥炭退化的管理实践,例如重新灌,对于N2 O减少和气候目标至关重要.
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