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DOI	10.1111/gcb.17233
	Soil N2O emissions from specialty crop systems: A global estimation and meta-analysis
	Li, Lidong; Hong, Mu; Zhang, Yao; Paustian, Keith
发表日期	2024
ISSN	1354-1013
EISSN	1365-2486
起始页码	30
结束页码	3
卷号	30 期号:3
英文摘要	Nitrous oxide (N2O) is a potent greenhouse gas (GHG) that also depletes stratospheric ozone. Nitrogen (N) fertilizer rate is the best single predictor of N2O emissions from agricultural soils, which are responsible for similar to 50% of the total global anthropogenic flux, but it is a relatively imprecise estimator. Accumulating evidence suggests that the emission response to increasing N input is exponential rather than linear, as assumed by Intergovernmental Panel on Climate Change methodologies. We performed a metaanalysis to test the generalizability of this pattern. From 78 published studies (233 site-years) with at least three N-input levels, we calculated N2O emission factors (EFs) for each nonzero input level as a percentage of N input converted to N2O emissions. We found that the N2O response to N inputs grew significantly faster than linear for synthetic fertilizers and for most crop types. N-fixing crops had a higher rate of change in EF (Delta EF) than others. A higher Delta EF was also evident in soils with carbon >1.5% and soils with pH <7, and where fertilizer was applied only once annually. Our results suggest a general trend of exponentially increasing N2O emissions as N inputs increase to exceed crop needs. Use of this knowledge in GHG inventories should improve assessments of fertilizer-derived N2O emissions, help address disparities in the global N2O budget, and refine the accuracy of N2O mitigation protocols. In low-input systems typical of sub-Saharan Africa, for example, modest N additions will have little impact on estimated N2O emissions, whereas equivalent additions (or reductions) in excessively fertilized systems will have a disproportionately major impact.
英文关键词	crop yield; global climate change; global soil N2O emission; irrigation; nitrogen fertilizer; soil organic carbon
语种	英语
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
WOS类目	Biodiversity Conservation ; Ecology ; Environmental Sciences
WOS记录号	WOS:001182442000001
来源期刊	GLOBAL CHANGE BIOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/290473
作者单位	Colorado State University; Colorado State University
推荐引用方式 GB/T 7714	Li, Lidong,Hong, Mu,Zhang, Yao,et al. Soil N2O emissions from specialty crop systems: A global estimation and meta-analysis[J],2024,30(3).
APA	Li, Lidong,Hong, Mu,Zhang, Yao,&Paustian, Keith.(2024).Soil N2O emissions from specialty crop systems: A global estimation and meta-analysis.GLOBAL CHANGE BIOLOGY,30(3).
MLA	Li, Lidong,et al."Soil N2O emissions from specialty crop systems: A global estimation and meta-analysis".GLOBAL CHANGE BIOLOGY 30.3(2024).