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pubmed-article:18022740pubmed:abstractTextStreamwater was sampled at high flows from 14 catchments with different (0-78%) percentages of broadleaf woodland cover in acid-sensitive areas in the UK to investigate whether woodland cover affects streamwater acidification. Significant positive correlations were found between broadleaf woodland cover and streamwater NO3 and Al concentrations. Streamwater NO3 concentrations exceeded non-marine SO4 in three catchments with broadleaf woodland cover>or=50% indicating that NO3 was the principal excess acidifying ion in the catchments dominated by woodland. Comparison of calculated streamwater critical loads with acid deposition totals showed that 11 of the study catchments were not subject to acidification by acidic deposition. Critical loads were exceeded in three catchments, two of which were due to high NO3 concentrations in drainage from areas with large proportions of broadleaved woodland. The results suggest that the current risk assessment methodology should protect acid-sensitive catchments from potential acidification associated with broadleaf woodland expansion.lld:pubmed
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pubmed-article:18022740pubmed:articleTitleEffects of broadleaf woodland cover on streamwater chemistry and risk assessments of streamwater acidification in acid-sensitive catchments in the UK.lld:pubmed
pubmed-article:18022740pubmed:affiliationSchool of GeoSciences, The University of Edinburgh, Crew Building, West Mains Road, Edinburgh, EH9 3JN, Scotland, UK.lld:pubmed
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pubmed-article:18022740pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed