气候变化领域集成服务门户(CCPortal): Daily denitrification rates in floodplains under contrasting pedo-climatic and anthropogenic contexts: modelling at the watershed scale

CCPortal

DOI	10.1007/s10533-020-00677-4
	Daily denitrification rates in floodplains under contrasting pedo-climatic and anthropogenic contexts: modelling at the watershed scale
	Fabre C.; Sauvage S.; Guilhen J.; Cakir R.; Gerino M.; Sánchez-Pérez J.M.
发表日期	2020
ISSN	0168-2563
起始页码	317
结束页码	336
卷号	149 期号:3
英文摘要	Floodplains play a crucial role in water quality regulation via denitrification. This biogeochemical process reduces nitrate (NO3−), with aquifer saturation, organic carbon (OC) and N availability as the main drivers. To accurately describe the denitrification in the floodplain, it is necessary to better understand nitrate fluxes that reach these natural bioreactors and the transformation that occurs in these surface areas at the watershed scale. At this scale, several approaches tried to simulate denitrification contribution to nitrogen dynamics in study sites. However, these studies did not consider OC fluxes influences, hydrological dynamics and temperature variations at a daily time step. This paper focuses on a new model that allows insights on nitrate, OC, discharge and temperature influences on daily denitrification for each water body. We used a process-based deterministic model to estimate daily alluvial denitrification in different watersheds showing various pedo-climatic conditions. To better understand global alluvial denitrification variability, we applied the method to three contrasting catchments: The Amazon for tropical zones, the Garonne as representative of the temperate climate and the Yenisei for cold rivers. The Amazon with a high discharge, frequent flooding and warm temperature, leads to aquifers saturation, and stable OC concentrations. Those conditions favour a significant loss of N by denitrification. In the Garonne River, the low OC delivery limits the denitrification process. While Arctic rivers have high OC exports, the low nitrate concentrations and cold temperature in the Yenisei River hinder denitrification. We found daily alluvial denitrification rates of 73.0 ± 6.2, 4.5 ± 1.4 and 0.7 ± 0.2 kgN ha−1 y−1 during the 2000–2010 period for the Amazon, the Garonne and the Yenisei respectively. This study quantifies the floodplains influence in the water quality regulation service, their contribution to rivers geochemical processes facing global changes and their role on nitrate and OC fluxes to the oceans. © 2020, Springer Nature Switzerland AG.
英文关键词	Daily time step; Denitrification; Floodplains; Nitrate; Organic carbon; Watershed
语种	英语
scopus关键词	anthropogenic effect; biogeochemistry; catchment; climate change; climate conditions; denitrification; environmental modeling; floodplain; flux measurement; scale effect; water quality; watershed; Amazonia; Garonne River; Russian Federation; Yenisei River
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/153125
作者单位	Laboratoire écologie fonctionnelle et environnement, Université de Toulouse, CNRS, INPT, UPS, Toulouse, France
推荐引用方式 GB/T 7714	Fabre C.,Sauvage S.,Guilhen J.,et al. Daily denitrification rates in floodplains under contrasting pedo-climatic and anthropogenic contexts: modelling at the watershed scale[J],2020,149(3).
APA	Fabre C.,Sauvage S.,Guilhen J.,Cakir R.,Gerino M.,&Sánchez-Pérez J.M..(2020).Daily denitrification rates in floodplains under contrasting pedo-climatic and anthropogenic contexts: modelling at the watershed scale.Biogeochemistry,149(3).
MLA	Fabre C.,et al."Daily denitrification rates in floodplains under contrasting pedo-climatic and anthropogenic contexts: modelling at the watershed scale".Biogeochemistry 149.3(2020).