Nonlinear response of soil nitric oxide emissions to fertilizer nitrogen across croplands

IF 5.1 1区农林科学 Q1 SOIL SCIENCE Biology and Fertility of Soils Pub Date : 2024-03-23 DOI:10.1007/s00374-024-01818-9

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Abstract

Nitric oxide (NO), as a short-lived climate forcer, has direct and indirect detrimental impacts on environmental quality and human health. The amount of nitrogen (N) fertilizer application to agricultural soils is considered a robust predictor of total NO emissions, but the estimates of cropland NO emissions have large uncertainties due to the widely used constant emission factors (EF) as e.g., default values recommended by Intergovernmental Panel on Climate Change (IPCC) methodologies. By compiling 223 field experiments with at least three N-input levels across various croplands, we performed a meta-analysis to determine how soil NO emissions respond to N inputs. Our results showed for the first time that the mean change in EF per unit of additional N input (∆EF) across all available data was significantly higher as compared to zero, indicating that the NO response to N additions increased significantly faster than the assumed linear. On average, upland grain crops showed significantly higher ∆EF than that of horticultural crops or lowland rice. A higher ∆EF was also appeared in sites with mean annual precipitation < 600 mm, mean annual temperature ≥ 15 °C, soil organic carbon ≥ 14 g C kg^− 1 or total N ≥ 1.4 g N kg^− 1, and where synthetic N fertilizers were usually applied. By assuming various N application rates, the IPCC default (0.7% or 1.1%) EF model would have overestimated or underestimated NO emissions compared to our ∆EF model. Overall, our meta-analysis results exert high potential to improve estimates of cropland NO inventories, and help address disparities in global NO budgets and develop more targeted mitigation efforts.

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不同农田土壤一氧化氮排放量对化肥氮的非线性响应

摘要一氧化氮（NO）作为一种短寿命气候致变剂，对环境质量和人类健康有着直接和间接的不利影响。农业土壤的氮肥施用量被认为是预测氮氧化物总排放量的可靠指标，但由于广泛采用政府间气候变化专门委员会（IPCC）方法推荐的默认值等恒定排放因子（EF），对耕地氮氧化物排放量的估计具有很大的不确定性。我们汇编了 223 项田间试验，其中至少有三种氮输入水平，涉及不同的耕地，我们对这些试验进行了元分析，以确定土壤氮氧化物排放量是如何随氮输入而变化的。我们的研究结果首次表明，在所有可用数据中，每增加一单位氮的输入，EF 的平均变化（∆EF）明显高于零，这表明氮氧化物对氮输入的响应明显快于假定的线性响应。平均而言，高地粮食作物的 ∆EF 明显高于园艺作物或低地水稻。在年平均降水量 < 600 毫米、年平均气温≥ 15 °C、土壤有机碳≥ 14 克 C kg- 1 或总氮≥ 1.4 克 N kg- 1 以及通常施用合成氮肥的地区，ΔEF 也较高。通过假设不同的氮肥施用率，与我们的 ∆EF 模型相比，IPCC 默认的（0.7% 或 1.1%）EF 模型会高估或低估氮氧化物的排放量。总之，我们的荟萃分析结果极有可能改进耕地氮氧化物清单的估算，并有助于解决全球氮氧化物预算的差异，制定更有针对性的减排措施。

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来源期刊

Biology and Fertility of Soils 农林科学-土壤科学

CiteScore

11.80

自引率

10.80%

发文量

审稿时长

2.2 months

期刊介绍： Biology and Fertility of Soils publishes in English original papers, reviews and short communications on all fundamental and applied aspects of biology – microflora and microfauna - and fertility of soils. It offers a forum for research aimed at broadening the understanding of biological functions, processes and interactions in soils, particularly concerning the increasing demands of agriculture, deforestation and industrialization. The journal includes articles on techniques and methods that evaluate processes, biogeochemical interactions and ecological stresses, and sometimes presents special issues on relevant topics.