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Does road salting induce or ameliorate DOC mobilization from roadside soils to surface waters in the long term?

Green, Sophie M.; Machin, Robert and Cresser, Malcolm S. (2009). Does road salting induce or ameliorate DOC mobilization from roadside soils to surface waters in the long term? Environmental Monitoring and Assessment, 153(1-4) pp. 435–448.

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Soils down slope of roads have been affected over decades by road salting in the UK uplands. Salt additions to fresh soil facilitate dispersal of organic matter so there is a potential risk of release of DON and DOC to nearby rivers where these run parallel to roads. Over time, however, salting enhances soil pH of naturally acid soils, and thus organic matter degradation through to CO2, thereby, lowering soil organic matter content. In addition any relatively labile organic matter may have already been dispersed. Thus, it is hypothesised that enhanced DOC mobilisation should only be a potential problem if soils not previously exposed to salt become heavily exposed in the future. This paper combines data from field observations and laboratory simulations to elucidate mechanisms controlling organic matter mobilisation processes to determine what controls spatial and temporal trends in DOC concentrations in soil solutions down slope of roads. Organic matter solubilisation is dependent on the degree of road salt exposure soils have had. The laboratory experiment provided evidence that there are two competing effects upon which solubilisation is dependent (a) pH suppression and (b) sodium dispersion. Other organic matter solubility models, if correct, link quite well with the authors “when it’s gone, it’s gone” hypothesis.

Item Type: Journal Article
Copyright Holders: 2009 Springer Netherlands
ISSN: 1573-2959
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNot SetNERC (Natural Environment Research Council)
Not SetNot SetDEFRA
Not SetNot SetUniversity of York
Keywords: road salt; sodium chloride; DOC concentration; upland river
Academic Unit/Department: Science > Environment, Earth and Ecosystems
Item ID: 26916
Depositing User: Sophie Green
Date Deposited: 24 Jan 2011 18:27
Last Modified: 20 Mar 2014 13:51
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