Nitrates - loss processes in raw water

Hall, G.H. (1988) Nitrates - loss processes in raw water. Ambleside, UK, Freshwater Biological Association, 47pp. (WI/T04010-2/1).

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This project investigated the production of nitrate (nitrification) by bacteria in lakes. The work was undertaken as nitrification is a key process in the nitrogen cycle and previous estimates of rates of nitrification were unreliable. When different methods were used to estimate rates of nitrification within sediment deposits different results were obtained. Investigation' of specific aspects of these methodologies has allowed some rationalization of these observations and also enabled comparisons of previously published data which, beforehand, was not possible. However, it was not clear which methods gave the most reliable rate estimates. Calculation of a nitrate budget for Grasmere lake indicated that the use of methods which involved the mixing of surface sediments (and therefore disrupted preformed nutrient gradients) overestimated the rate of nitrification. The study concludes that slight changes in the method used to prepare sediment slurries can result in large changes, in the measured nitrifying activity. This makes comparisons between studies, using different methods, extremely difficult. Methods to study sediment nitrification processes which do not disrupt preformed substrate gradients within the sediment provide the most reliable rate estimates.

Item Type: Monograph or Serial Issue
Title: Nitrates - loss processes in raw water
Personal Creator/Author:
Hall, G.H.
Number of Pages: 47
Date: 1988
Publisher: Freshwater Biological Association
Place of Publication: Ambleside, UK
Issuing Agency: Freshwater Biological Association
Uncontrolled Keywords: Bacteria; Nitrification; Freshwater lakes; Sediment samples; Slurries; Seasonal variations; Methodology; England; Grasmere Lake
Subjects: Ecology
Item ID: 5208
Depositing User: Hardy B Schwamm
Date Deposited: 28 Apr 2011 16:35
Last Modified: 29 Sep 2011 15:16
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