Early Effects of Atmospheric Ammonia Deposition on Calluna Vulgaris (L.) Hull Growing on an Ombrotrophic Peat Bog |
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| Authors: | J A Carfrae L J Sheppard J A Raven I D Leith W Stein A Crossley and M Theobald |
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| Institution: | (1) CEH Edinburgh, The Bush Estate Penicuik, EH260QB Midlothian, UK;(2) University of Dundee at SCRI, SCRI, Invergowrie, DD2 5DA Dundee, UK;(3) Scottish Crop Research Institute, SCRI, Invergowrie, DD2 5DA Dundee, UK |
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| Abstract: | This paper reports data from a field study investigating the impacts of elevated ammonia (NH3) deposition on Calluna vulgaris growing on an ombrotrophic peat bog in S.E. Scotland. Shoot extension, foliar N concentrations, chlorophyll concentration and chlorophyll fluorescence were measured during the second growing season of exposure to a gradient of ammonia concentrations. Results indicate that NH3 increases growth between 150–200 kg N ha–1y–1 cumulative deposition. Foliar N content increased significantly in response to NH3 cumulative deposition up to 400 kg N ha–1 y–1 whereas chlorophyll a content significantly decreased. Measurements of Fv/Fm suggest that although NH3 exposure altered the growth and reduced chlorophyll a, the efficiency of photosystem II was insensitive to NH3-N deposition at this stage. |
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| Keywords: | ammonia Calluna vulgaris chlorophyll field simulation foliar N concentration photosystem II efficiency shoot growth |
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