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土壤 N₂ O 特殊作物系统的排放:全球估计和元分析

Lidong Li¹, Mu Hong², Yao Zhang²

¹Department of Soil and Crop Sciences, Colorado State University, Fort Collins, Colorado, USA.

Global change biology

|March 12, 2024

概括

农业管理显著影响特殊作物的氧化 (N₂O) 排放. 本研究估计了全球N₂O排放量,并确定了减轻它们的策略.

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 (N₂ O) 是一种有力温室气体,有助于全球变暖.
农业实践,特别是 (N) 肥料的使用和灌,是土壤N2O排放的主要来源.
专用作物系统对全球农业至关重要,通常涉及密集管理,并没有全面评估N2O排放.

研究的目的:

为了全面评估全球土壤N2O排放来自特殊作物系统.
分析农业管理和环境因素对这些排放的影响.
为了估计全球特种作物土壤的N₂O总排放量.

主要方法:

综合了114项已发表的研究中的1137个观察结果.
评估农业管理实践 (N肥料,灌,耕作,覆盖作物,生物炭).
评估环境因素 (温度,降水,土壤有机碳,pH).

主要成果:

全球土壤N2O排放来自特种作物估计为1.5TgN2O-Nyr-1 (范围为0.54.5TgN2O-Nyr-1).
土壤N₂ O排放量随着N肥料率的增加而呈指数级增长.
肥对N₂O排放的影响由更高的温度,降水和土壤有机碳放大,但由于土壤pH值更高而减少.

结论:

滴灌,灌和减少耕作可以减轻N2O排放,同时提高作物产量.
缺水灌和非豆类覆盖作物减少N2O排放,但可能影响产量.
生物炭具有有限的N₂ O减排潜力,但可以提高作物产量,为减少农业N₂ O排放提供有效的策略.

关键词:

农作物产量农作物产量全球气候变化全球气候变化全球土壤N2O排放量灌灌方式化肥化肥是一种化肥.土壤有机碳土壤有机碳

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