NDLI: Factors controlling nitrate concentrations in surface waters of an artificially drained agricultural watershed

Content Provider	Springer Nature Link
Author	Billy, Claire Birgand, François Ansart, Patrick Peschard, Julien Sebilo, Mathieu Tournebize, Julien
Copyright Year	2013
Abstract	Land managers need to clearly identify the main natural factors controlling nitrate attenuation from upstream to downstream in agricultural watersheds. All interfaces between surface waters and groundwaters such as riparian zones could be identified as retention zones in the watershed. However, in highly human-influenced agricultural landscapes, retention zones could be shortcut, abandoned and sometimes erased. Starting from this situation, this paper aims to underline the role of hydrological and biogeochemical retention processes in the determination of nitrate concentration in an artificially drained agricultural watershed. The Orgeval watershed (East part of Paris, France, belonging to a long-term environmental observatory network) is 80 % covered by drained agricultural plots, 17 % forest and 3 % urban areas and roads, covering a surface area of 104 km$^{2}$. The watershed is split into several nested sub-basins from 1 to 100 km$^{2}$. Two levels of monitoring were carried out in the 2007–2008 hydrological year: long-term at six monitoring stations (measuring nitrate concentration and discharge) and 20 points throughout the watershed (measuring discharge, chloride, nitrate, sulphate, calcium concentration and nitrogen isotopic composition) for three different dates (10/18/2007, 01/23/2008, 04/10/2008). Artificial drainage generates modified water transfer and thus nitrate transformation processes during the wet drainage season in winter. Dilution processes provided by forested areas seem to be one of the main factor determining global water quality. A threshold of 34 % forested cover maintains the nitrate concentration below the drinking-water limit (11.3 mgN L$^{−1}$). Nevertheless, statistical analysis, isotopic measurements and the analysis of the nitrate versus chloride ratio showed that retention processes also influence water quality during the dry season.
Starting Page	665
Ending Page	684
Page Count	20
File Format	PDF
ISSN	09212973
Journal	Landscape Ecology
Volume Number	28
Issue Number	4
e-ISSN	15729761
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-03-17
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Nitrate Land use Isotopic nitrogen Retention Subsurface drainage Forested area Landscape Ecology Plant Ecology Forestry Management Forestry Ecology Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Geography, Planning and Development Ecology Nature and Landscape Conservation

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