管理实践对氧化物排放在灌乳制品料旋转中的影响
R S Dungan1, A B Leytem1, G J Miito2
1USDA-ARS, Northwest Irrigation and Soil Research Laboratory, Kimberly, Idaho, USA.
Journal of environmental quality
|August 6, 2025
概括
乳制品物的遗留效应在应用停止后很长时间,在半干旱灌玉米系统中显著增加了氧化 (N2O) 排放量. 填的影响是短暂的,突出显示了综合管理的需要.
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:
- 氧化 (N2O) 排放是半干旱,灌作物系统的一个重大问题.
- 耕地,营养来源和覆盖作物是已知的N2O影响因素,但它们的长期相互作用效应需要进一步研究.
研究的目的:
- 量化耕作,源和覆盖作物的长期相互作用影响,从连续化玉米系统的N2O排放.
- 评估乳制品肥应用对后续N2O流的遗留影响.
主要方法:
- 一个因数实验结合了传统与减少耕作,乳制品肥与合成肥料,和三级覆盖作物与地.
- 在治疗实施6年后,N2O流量在3年 (2021-2023) 期间每周使用通风,非稳定状态室进行监测.
- 在2021年停止应用后,评估了2015-2020年应用的物的遗留效应.
主要成果:
- 与合成肥料相比,用肥料处理的地块始终显示出明显更高的N2O排放量 (2021年为723%,2022年为267%,2023年为147%).
- 减少耕作最初在2021年增加了N2O排放,但在2022年全场耕后,这种效应消失了.
- 冬季覆盖作物减少了土壤酸盐,但并没有减少由于持续矿化而造成的肥土壤N2O损失.
结论:
- 乳制品物的遗留效应在停止应用后的多年内仍然存在,这对N2O排放有重大贡献.
- 在这个系统中,耕作对N2O排放的影响似乎是短暂的.
- 对于肥料,耕作和灌的综合管理策略对于优化营养使用和减少半干旱灌系统中N2O排放至关重要.
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