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Updated: Aug 11, 2026

Understanding Dissolved Organic Matter Biogeochemistry Through In Situ Nutrient Manipulations in Stream Ecosystems
Published on: October 29, 2016
Factors affecting nitrification in situ in a heated stream
Abstract:
Nitrification, previously shown to occur in the stream under study, ensued only when the stream received heated (28 degree C or above) discharges and was negligible when water temperatures were 17 degree C or lower. The most probable number os ammonium oxidizer in stream bed sediments exceeded intrite oxidizers by ratios of 43:1 to 1,113:1, and the average rate of ammonium oxidation in this stream, 0.50 mg of NH4-N/liter per h exceeded the rate of nitrite oxidation, 0.29 mg of NO2-N/liter per h, resulting in an accumulation of nitrite. Nitrification rates were influenced by the dissolved oxygen concentration, increasing during daylight hours and exhibiting maximum rates during the summer months.
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