A Comparison of Impacts of N Deposition Applied as NH~3 or as NH~4Cl on Ombrotrophic Mire Vegetation

Leith, I.; Pitcairn, C. E. R.; Sheppard, L.; Hill, P. W.; Cape, J. N.; Fowler, D.; Tang, Y. S.; Smith, R. I.; Parrington, J. A.. 2002 A Comparison of Impacts of N Deposition Applied as NH~3 or as NH~4Cl on Ombrotrophic Mire Vegetation. Phyton (Austria) Special Issue: Global Change, 42 (3). 83-88.

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The impacts of increased N deposition (wet; NH4+ and dry; NH3) on ombrotrophic mire vegetation were compared in a two year dose response study. Vegetation from an ombrotrophic mire in SE Scotland was exposed in open-top chambers to a range of wet N deposition at 0 (de-ionised water), 8, 16, 32, 64 & 128kg N ha-1y-1 applied as NH4CI and dry N deposition as gaseous NH3 at concentrations of 2, 6, 20, 50 & 90 ug m-3. N concentrations in the foliage of all species showed a significant linear increase in response to dose when N was applied as wet deposited NH4+ in both 1999 and 2000. Comparison of the linear regression for foliar N versus NH4+ and NH3 in the dose-response relaitonships showed significant differences (p,0.05) between the form of N applied and %N concentration for two species in 1999 (C. vulgaris and P. commune) but not in 2000. There was a significant incrase in C. vulgaris shoot growth in the NH3 treatments compared to NH4+ treatments when expressed per unit deposited N. Effects of nitrogen deposited as gaseous NH3 are generally greater than those of wet deposited NH4+ on moorland species, when expressed per unit deposited N.

Item Type: Publication - Article
Programmes: CEH Programmes pre-2009 publications > Biogeochemistry > BG02 Recovery from acidification and eutrophication
UKCEH and CEH Sections/Science Areas: _ Biogeochemistry & Ecosystem Function
ISSN: 0079-2047
NORA Subject Terms: Agriculture and Soil Science
Ecology and Environment
Atmospheric Sciences
Date made live: 28 Jul 2009 15:41 +0 (UTC)

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