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The Nitrogen Cycle in Lough Neagh, N. Ireland 1975 to 1987

✍ Scribed by C. E. Gibson; R. V. Smith; D. A. Stewart

Publisher: John Wiley and Sons
Year: 1992
Tongue: English
Volume: 77
Category: Article
ISSN: 1434-2944
DOI: 10.1002/iroh.19920770106

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✦ Synopsis

Results from thirteen years of weekly observations are presented on the nitrogen cycle in Lough Neagh. The data comprised catchment and atmospheric inputs, output via the outflow and calculated losses by sedimentation and denitrification. Nitrate-nitrogen in the rivers is the dominant input fraction and the nitrate loading has increased over the period observed. 52 % of the input N sediments to the lake bottom, but 65 % of this is lost by denitrification. In spite of increasing nitrogen inputs, the summer soluble nitrate concentrations have decreased due to uptake by a perpetual crop of the cyanobacterium Oscillatoria agardhii GOMONT.

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