Brunel University Research Archive (BURA) >
University >
Brunel University Theses >

Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/6587

Title: A study of nitrification in lakes of the English Lake District
Authors: Hall, Grahame
Advisors: Jones, JG
Keywords: English Lake District
Nitrification
Lacustrine environment
Nitrate concentration
Sediment
Publication Date: 1981
Abstract: Nitrification became the dominant nitrogen transformation in a number of lakes which accumulated ammonium, in hypolimnetic water, under aerobic conditions. The timing and duration of this activity varied between lakes but was characterized by decreasing ammonium, and increasing nitrate, concentrations. In Grasmere lake this phase was found to be due to the activity of planktonic chemolithotrophic nitrifying bacteria. The observed nitrate concentration increased during this phase and accounted for up to 15% of the total oxygen deficit of the hypolimnion. At similar in situ temperatures nitrification rates and nitrifying bacterial populations were greater in oxidised sediments than in the water column. Littoral sediments were more important than profundal sediments as sites of nitrification due to higher temperatures and the persistance of oxidising conditions to greater depths into these deposits. Within the littoral zone the physical characteristics of the sediment were important with organic rich deposits sustaining greater rates of nitrification than sandy sediments. Nitrate reduction was the primary determining factor of nitrate concentrations in sediment interstitial waters. Some observations on the culture of chemolithotrophic nitrifying bacteria from lakewater were discussed. Reviews of the methodology for nitrification research and nitrification in the lacustrine environment are presented.
Description: This thesis was submitted for the degree of Doctor of Philosophy and was awarded by Brunel University.
Sponsorship: The Department of the Environment, contract number D.G.R.480/32.
URI: http://bura.brunel.ac.uk/handle/2438/6587
Appears in Collections:Brunel University Theses
Environment

Files in This Item:

File Description SizeFormat
FullTextThesis.pdf12.33 MBAdobe PDFView/Open

Items in BURA are protected by copyright, with all rights reserved, unless otherwise indicated.