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Nitrogen cycle disruption through the application of de-icing salts on upland highways

Green, Sophie M. and Cresser, Malcolm S. (2008). Nitrogen cycle disruption through the application of de-icing salts on upland highways. Water, Air, and Soil Pollution, 188 pp. 139–153.

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It is hypothesized that episodic introductions of road salt severely disrupt the soil nitrogen cycle at a range of spatial and temporal scales. A field-scale study has confirmed impacts on the nitrogen cycle in soil, soil solution and river samples. There is evidence that ammonium-N retention on cation exchange sites has been reduced by the presence of sodium ions, and that ammonium-N has been flushed from the exchange sites. Increases in soil pH have been caused in naturally acidic uplands. These have enhanced mineralization of organic-N, especially nitrification, leading to a reduction in the mineralizable-N pool of roadside soils. There is evidence to support the hypothesis that organic matter content has been lowered over decades either through desorption or dispersal processes. Multiple drivers are identified that contribute to the disruption of nitrogen cycling processes, but their relative importance is difficult to quantify unequivocally. The influence of road salt on soil and soil solution declines with distance from the highway, but impacts on water chemistry in a local stream are still strongly evident at some distance from the road.

Item Type: Journal Item
Copyright Holders: 2007 Springer Science + Business Media B.V
ISSN: 1573-2932
Keywords: cationic displacement - nitrogen cycle - road salt - sodium chloride
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Environment, Earth and Ecosystem Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 27256
Depositing User: Sophie Green
Date Deposited: 26 Jan 2011 13:55
Last Modified: 02 May 2018 13:26
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