PMID: 18213973Jan 25, 2008Paper

15N-Nitrate signature in low-order streams: effects of land cover and agricultural practices

Ecological Applications : a Publication of the Ecological Society of America
S LefebvrePierre Marmonier

Abstract

Many studies have shown that intensive agricultural practices significantly increase the nitrogen concentration of stream surface waters, but it remains difficult to identify, quantify, and differentiate between terrestrial and in-stream sources or sinks of nitrogen, and rates of transformation. In this study we used the delta15N-NO3 signature in a watershed dominated by agriculture as an integrating marker to trace (1) the effects of the land cover and agricultural practices on stream-water N concentration in the upstream area of the hydrographic network, (2) influence of the in-stream processes on the NO3-N loads at the reach scale (100 m and 1000 m long), and (3) changes in delta15N-NO3 signature with increasing stream order (from first to third order). This study suggests that land cover and fertilization practices were the major determinants of delta15N-NO3 signature in first-order streams. NO3-N loads and delta15N-NO3 signature increased with fertilization intensity. Small changes in delta15N-NO3 signature and minor inputs of groundwater were observed along both types of reaches, suggesting the NO3-N load was slightly influenced by in-stream processes. The variability of NO3-N concentrations and delta15N signature decreas...Continue Reading

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Citations

Jan 20, 2011·Environmental Science and Pollution Research International·Angelika NestlerPhilip Taylor
Sep 5, 2012·Environmental Science and Pollution Research International·Bernadette TeuflThomas Hein
Apr 3, 2014·Ecological Applications : a Publication of the Ecological Society of America·Carla L AtkinsonCaryn C Vaughn
Aug 20, 2009·Ecological Applications : a Publication of the Ecological Society of America·Matthew W Diebel, M Jake Vander Zanden
Jul 29, 2011·The Science of the Total Environment·Christophe PiscartPierre Marmonier
Mar 10, 2017·International Journal of Environmental Research and Public Health·Fangli SuHaisheng Liu
Jul 19, 2017·Ecological Applications : a Publication of the Ecological Society of America·Emily HoweAndrea Ogston
Dec 29, 2017·Ecology Letters·Benjamin W AbbottGilles Pinay
Dec 6, 2017·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Bao HaClare N Muhoro
Aug 16, 2021·The Science of the Total Environment·Luca GuillaumotLuc Aquilina

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