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DOI	10.1111/gcb.17165
	Global cropland nitrous oxide emissions in fallow period are comparable to growing-season emissions
	Shang, Ziyin; Cui, Xiaoqing; van Groenigen, Kees Jan; Kuhnert, Matthias; Abdalla, Mohamed; Luo, Jiafa; Zhang, Weijian; Song, Zhenwei; Jiang, Yu; Smith, Pete; Zhou, Feng
发表日期	2024
ISSN	1354-1013
EISSN	1365-2486
起始页码	30
结束页码	2
卷号	30 期号:2
英文摘要	Croplands account for similar to one-third of global anthropogenic nitrous oxide (N2O) emissions. A number of recent field experiments found substantial fallow-period N2O emissions, which have been neglected for decades. However, the global contribution of the fallow-period emissions and the associated drivers remain unclear. Based on 360 observations across global agroecosystems, we simulated the ratio of the fallow to the whole-year N2O emissions (R-fallow) by developing a mixed-effect model and compiling cropping-system-specific input data. Our results revealed that the mean global gridded R-fallow was 44% (15%-75%, 95% confidence interval), with hotspots mainly in the northern high latitudes. For most cropping systems, soil pH was the dominant driver of global variation in R-fallow. Global cropland emission factors (i.e., the percentage of fertilizer N emitted as N2O, EFs) in EF-based models doubled to 1.9% when the fallow-period N2O emissions were included in our simulation, similar to EFs estimated by process-based and atmospheric inversion models (1.8%-2.3%). Overall, our study highlights the importance of fallow-period N2O emissions in annual totals, especially for single cropping systems and croplands in acidic areas. To accurately estimate N2O emissions for national greenhouse gas inventories, it is crucial to update current EFs with full consideration of the fallow-period N2O emissions in the Intergovernmental Panel on Climate Change (IPCC) Tier 1 method.
英文关键词	cropping system; greenhouse gas; inventory; nitrous oxide; non-growing season; simulation; spatial variation
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:001152612900001
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/298654
作者单位	Chinese Academy of Agricultural Sciences; Institute of Crop Sciences, CAAS; Beijing Forestry University; University of Exeter; University of Aberdeen; AgResearch - New Zealand; Nanjing Agricultural University; Peking University; Hohai University
推荐引用方式 GB/T 7714	Shang, Ziyin,Cui, Xiaoqing,van Groenigen, Kees Jan,et al. Global cropland nitrous oxide emissions in fallow period are comparable to growing-season emissions[J],2024,30(2).
APA	Shang, Ziyin.,Cui, Xiaoqing.,van Groenigen, Kees Jan.,Kuhnert, Matthias.,Abdalla, Mohamed.,...&Zhou, Feng.(2024).Global cropland nitrous oxide emissions in fallow period are comparable to growing-season emissions.GLOBAL CHANGE BIOLOGY,30(2).
MLA	Shang, Ziyin,et al."Global cropland nitrous oxide emissions in fallow period are comparable to growing-season emissions".GLOBAL CHANGE BIOLOGY 30.2(2024).