气候变化领域集成服务门户(CCPortal): Modeling indirect N2O emissions along the N cascade from cropland soils to rivers

CCPortal

DOI	10.1007/s10533-020-00654-x
	Modeling indirect N2O emissions along the N cascade from cropland soils to rivers
	Billen G.; Garnier J.; Grossel A.; Thieu V.; Théry S.; Hénault C.
发表日期	2020
ISSN	0168-2563
起始页码	207
结束页码	221
卷号	148 期号:2
英文摘要	The frequently observed discrepancy between estimations of N2O emissions at regional or global scale based either on field data or inventories (bottom-up) or on direct atmospheric observations (top-down) suggests that riparian areas and river surfaces play a significant role as hot spots of emission. We developed a modeling procedure to assess N2O emissions occurring during the transfer of water masses from the subroot water pool of the watershed to the outlet of the river drainage network, including their passage through riparian wetlands. The model was applied to three river basins of increasing size located in the sedimentary geological area of the Paris basin (France) and validated by its capability to predict river N2O concentrations and fluxes across the river–atmosphere interface. At the scale of the Seine watershed, indirect emissions, i.e. emissions linked to agricultural practices but occurring elsewhere than directly at the field plot, are estimated to represent approximately 20% of the direct emissions from the watershed soils, in good agreement with previous estimates based on empirical accounting approaches. Denitrification in riparian zones is responsible for the largest share of these indirect emissions. The model results are very sensitive to the value of the ratio of N2O versus (N2 + N2O), in the final products of denitrification in rivers and wetlands. By calibration on river N2O concentrations, a value of 0.015 ± 0.05 is proposed for this ratio, in agreement with recent studies. This represents the main uncertainty factor of the model. In basins with conditions prone to increasing the value of this ratio, higher proportions of indirect N2O emissions might possibly be observed. © 2020, The Author(s).
英文关键词	Denitrification; Greenhouse gas indirect emissions; Loir river; Riparian wetlands; Seine river
语种	英语
scopus关键词	agricultural soil; denitrification; drainage network; estimation method; field method; greenhouse gas; inventory; nitrogen cycle; nitrous oxide; observational method; riparian zone; river basin; river water; trophic cascade; water mass; France; Seine River [France]
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153157
作者单位	SU CNRS EPHE, Metis UMR 7619, 4 Place Jussieu, BP 105, Paris, 75005, France; INRA, UR SOLS, Orléans, 45075, France; SU CNRS, FIRE FR3020, 4 Place Jussieu, BP 105, Paris, 75005, France; INRA, UMR Agroécologie, 17 rue Sully, BP 86510, Dijon, 21065, France
推荐引用方式 GB/T 7714	Billen G.,Garnier J.,Grossel A.,et al. Modeling indirect N2O emissions along the N cascade from cropland soils to rivers[J],2020,148(2).
APA	Billen G.,Garnier J.,Grossel A.,Thieu V.,Théry S.,&Hénault C..(2020).Modeling indirect N2O emissions along the N cascade from cropland soils to rivers.Biogeochemistry,148(2).
MLA	Billen G.,et al."Modeling indirect N2O emissions along the N cascade from cropland soils to rivers".Biogeochemistry 148.2(2020).