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Impacts of additional aerial inputs of nitrogen to salt marsh

In 2012 LAB Coastal carried out a desk-based investigation on the impacts of ...

A Portable Erosion Measuring Device (EMD)

When a river overtops its artificial flood banks, water running down the land...

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The Maylands
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Impacts of additional aerial inputs of nitrogen to salt marsh and transitional habitats – a desk study for the Countryside Commission for Wales

In 2012 LAB Coastal carried out a desk-based investigation on the impacts of aerial/atmospheric nitrogen (NOX and NH3), on salt marshes and other transitional habitats in Wales  The study set out to determine the most appropriate nitrogen critical load to apply to salt marshes within the defined range of 20 – 30 kg N ha-1 y-1.  The conclusions drawn were that it is unlikely that nitrogen inputs at the set critical loads will have any damaging effect on the salt marshes of Wales (or elsewhere in the UK).  Possible effects are most likely to be found in the tall vegetation of the closed upper marsh communities where interspecific competition is at its greatest.  Thus it was suggested that the value of 30 kg ha-1 y-1 be applied to most of the marsh with the lower level of 20 kg ha-1 y-1 being applied to the more densely vegetated upper marsh and to areas of marsh subjected to direct run-off from adjacent catchments. 

Boorman, L.A. and Hazelden, J. 2012.  Impacts of additional aerial inputs of nitrogen to salt marsh and transitional habitats. CCW Science Report No: 995, pp44, Countryside Council for Wales, Bangor, Wales