干旱区生态环境知识资源中心(Arid): Irrigation implementation promotes increases in salinity and nitrate concentration in the lower reaches of the Cidacos River (Navarre, Spain)

Arid

DOI	10.1016/j.scitotenv.2019.135701
	Irrigation implementation promotes increases in salinity and nitrate concentration in the lower reaches of the Cidacos River (Navarre, Spain)
	Merchan, D.1; Sanz, L.2; Alfaro, A.3; Perez, I 2; Goni, M.1; Solsona, F.4; Hernandez-Garcia, I 1; Perez, C.4; Casali, J.1
通讯作者	Merchan, D.
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2020
卷号	706
英文摘要	The shift from rainfed to irrigated agriculture is associated with a change in the fertilization rates due to increases in expected production and the fact of growing more N demanding crops. In addition, the circulation of irrigation return flows (IRF) mobilizes soluble salts stored in soils or geological materials. As a consequence, it implies severe modifications in the dynamics and total amount of soluble salts and nitrogen exported, especially in semi-arid watersheds. In this study, long-term data collected by the regional authorities was used to assess the effects of irrigation implementation on salinity (using electrical conductivity, EC, as a proxy) and nitrate concentration (NO3-) after the transformation of ca. 77 km(2) from rainfed to irrigated agriculture in the Cidacos River (CR) watershed. The results indicate that water quality in the lower reaches of the CR was significantly modified after the diffuse incorporation of IRF. In contrast, neither EC nor NO3- were different in those monitoring stations whose contributing watersheds did not include transformed area. In addition, the temporal dynamics in the analysed variables shifted from a rainfed land signal typical in the region to an irrigated land signal, and the hydrochemical type of the CR shifted from mixed-to-Na+-mixed-to-HCO3- to mostly Na+-mixed type, typical of waters affected by IRF in the region. Groundwater EC and NO3- also increased in those wells located within the irrigated area. Although there are great uncertainties in the actual amount of salt and N reaching the CR via IRF, the expected contribution of waste water spilled into the CR is minor in comparison to other sources, mostly agricultural sources in the case of N. The observed changes have promoted the designation of the lower reaches of the CR as affected by NO3- pollution, and the whole CR watershed as a Nitrate Vulnerable Zone, with the emergent question about whether irrigation implementation as carried out currently in Spain is against the environmental objectives of the Water Framework Directive. (C) 2018 Elsevier B.V. All rights reserved.
英文关键词	Land use change Irrigation return flows Water quality Salinization of water bodies Nitrate pollution
类型	Article
语种	英语
国家	Spain
收录类别	SCI-E
WOS记录号	WOS:000506376300083
WOS关键词	AREA LERMA BASIN ; AGRICULTURAL WATERSHEDS ; RETURN FLOWS ; SALT ; GROUNDWATER ; MANAGEMENT ; CATCHMENTS ; SUSTAINABILITY ; CONTAMINATION ; ATTENUATION
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/315496
作者单位	1.Univ Publ Navarra, Campus Arrosadia, Navarra 31006, Spain; 2.Environm Management Navarre, C Padre Adoain 219 Bojo, Navarra 31015, Spain; 3.Navarre Inst Agr & Food Technol & Infrastruct, Avda Serapio Huici 22, Navarra 31610, Spain; 4.Govt Navarre, Dept Rural Dev, Environm & Local Adm, C Gonzalez Tablas 9, Navarra 31003, Spain
推荐引用方式 GB/T 7714	Merchan, D.,Sanz, L.,Alfaro, A.,et al. Irrigation implementation promotes increases in salinity and nitrate concentration in the lower reaches of the Cidacos River (Navarre, Spain)[J],2020,706.
APA	Merchan, D..,Sanz, L..,Alfaro, A..,Perez, I.,Goni, M..,...&Casali, J..(2020).Irrigation implementation promotes increases in salinity and nitrate concentration in the lower reaches of the Cidacos River (Navarre, Spain).SCIENCE OF THE TOTAL ENVIRONMENT,706.
MLA	Merchan, D.,et al."Irrigation implementation promotes increases in salinity and nitrate concentration in the lower reaches of the Cidacos River (Navarre, Spain)".SCIENCE OF THE TOTAL ENVIRONMENT 706(2020).