改进的肥管理减少了北方草原农田的氧化排放量
D Ferland1, C Wagner-Riddle2, S E Brown2
1Department of Plant Sciences, University of Saskatchewan, Saskatchewan, Canada.
The Science of the total environment
|October 31, 2024
概括
改进的肥实践在四年内显著减少了兰花-小麦田的氧化物 (N2O) 排放量,57%. 这种加强的管理策略,专注于4R原则,在不影响作物产量的情况下减少了排放.
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:
- 耕作作物的耕地是氧化 (N2O) 排放的主要来源,主要来自 (N) 肥料的使用.
- 有限的研究存在于N2O动态在半干旱的北方草原内罗拉-小麦旋转.
- 了解肥管理对全年N2O排放的影响对于这个农业地区至关重要.
研究的目的:
- 评估肥管理对全年N2O排放的影响.
- 将4RN管理策略 (降低N率,提高效率N源) 与常见实践进行比较.
- 确定影响N2O流动事件的关键时期和因素.
主要方法:
- 从2021年1月到2024年4月,在加拿大萨斯喀彻温省测量了微气象N2O流.
- 将4RN管理方法与标准的区域化肥实践进行了比较.
- 分析了土壤酸盐水平和解条件对非生长季节排放的影响.
主要成果:
- 确定了N2O排放的两个高风险时期:受精后和春季解.
- 在研究期间,4RN管理策略减少了总N2O排放量57%,而不会造成产量损失.
- 种植季节的排放量占年度N2O的50%,而非种植季节的排放量有所不同 (11-67%),受土壤酸盐和融化条件的影响.
结论:
- 实施改进的4RN管理实践可以显著减轻作物系统累积的N2O排放.
- 降低N率和提高效率的肥料降低了N2O流量,特别是在充满水的高孔空间条件下.
- 长期应用更好的管理策略是减少农业温室气体排放的关键.
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