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Continuous ammonium enrichment of a woodland stream: uptake kinetics, leaf decomposition, and nitrification

Abstract

In order to test for nitrogen limitation and examine ammonium uptake by stream sediments, ammonium hydroxide was added continuously at concentrations averaging 100 /sup +/gl/sup -1/ for 70 days to a second-order reach of Walker Branch, an undisturbed woodland stream in Tennessee. Ammonium uptake during the first 4 h of addition corresponded to adsorption kinetics rather than to first-order uptake or to Michaelis-Menten kinetics. However, the calculated adsorption partition coefficient was two to four orders of magnitude greater than values reported for physical adsorption of ammonium, suggesting that the uptake was largely biotic. Mass balance indicated that the uptake of ammonium from the water could be accounted for by increased nitrogen content in benthic organic detritus. Nitrification, inferred from longitudinal gradients in NO/sub 3/, began soon after enrichment and increased dramatically near the end of the experiment. Both ammonium and nitrate concentrations dropped quickly to near background levels when input ceased, indicating little desorption or nitrification of excess nitrogen stored in the reach. There was no evidence of nitrogen limitation as measured by weight loss, oxygen consumption, phosphorus content, and macroinvertebrate density of red oak leaf packs, or by chlorophyll content and aufwuchs biomass on plexiglass slides. A continuous phosphorus  More>>
Publication Date:
Jan 01, 1983
Product Type:
Journal Article
Reference Number:
ERA-10-034761; EDB-85-106035
Resource Relation:
Journal Name: Freshwater Biol.; (United Kingdom); Journal Volume: 13
Subject:
54 ENVIRONMENTAL SCIENCES; AMMONIUM COMPOUNDS; UPTAKE; STREAMS; ECOLOGY; NITRIFICATION; DECOMPOSITION; DETRITUS; ENRICHMENT; EXPERIMENTAL DATA; KINETICS; LEAVES; MASS BALANCE; NITRATES; NITROGEN; TENNESSEE; CHEMICAL REACTIONS; DATA; ELEMENTS; FEDERAL REGION IV; INFORMATION; NITROGEN COMPOUNDS; NONMETALS; NORTH AMERICA; NUMERICAL DATA; OXYGEN COMPOUNDS; SURFACE WATERS; USA; 520100* - Environment, Aquatic- Basic Studies- (-1989)
OSTI ID:
5656683
Research Organizations:
Oak Ridge National Lab., TN
Country of Origin:
United Kingdom
Language:
English
Contract Number:
W-7405-ENG-26
Other Identifying Numbers:
Journal ID: CODEN: FWBLA
Submitting Site:
HEDB
Size:
Pages: 193-204
Announcement Date:
Jul 01, 1985

Citation Formats

Newbold, J D, Elwood, J W, Schulze, M S, Stark, R W, and Barmeier, J C. Continuous ammonium enrichment of a woodland stream: uptake kinetics, leaf decomposition, and nitrification. United Kingdom: N. p., 1983. Web. doi:10.1111/j.1365-2427.1983.tb00671.x.
Newbold, J D, Elwood, J W, Schulze, M S, Stark, R W, & Barmeier, J C. Continuous ammonium enrichment of a woodland stream: uptake kinetics, leaf decomposition, and nitrification. United Kingdom. doi:10.1111/j.1365-2427.1983.tb00671.x.
Newbold, J D, Elwood, J W, Schulze, M S, Stark, R W, and Barmeier, J C. 1983. "Continuous ammonium enrichment of a woodland stream: uptake kinetics, leaf decomposition, and nitrification." United Kingdom. doi:10.1111/j.1365-2427.1983.tb00671.x. https://www.osti.gov/servlets/purl/10.1111/j.1365-2427.1983.tb00671.x.
@misc{etde_5656683,
title = {Continuous ammonium enrichment of a woodland stream: uptake kinetics, leaf decomposition, and nitrification}
author = {Newbold, J D, Elwood, J W, Schulze, M S, Stark, R W, and Barmeier, J C}
abstractNote = {In order to test for nitrogen limitation and examine ammonium uptake by stream sediments, ammonium hydroxide was added continuously at concentrations averaging 100 /sup +/gl/sup -1/ for 70 days to a second-order reach of Walker Branch, an undisturbed woodland stream in Tennessee. Ammonium uptake during the first 4 h of addition corresponded to adsorption kinetics rather than to first-order uptake or to Michaelis-Menten kinetics. However, the calculated adsorption partition coefficient was two to four orders of magnitude greater than values reported for physical adsorption of ammonium, suggesting that the uptake was largely biotic. Mass balance indicated that the uptake of ammonium from the water could be accounted for by increased nitrogen content in benthic organic detritus. Nitrification, inferred from longitudinal gradients in NO/sub 3/, began soon after enrichment and increased dramatically near the end of the experiment. Both ammonium and nitrate concentrations dropped quickly to near background levels when input ceased, indicating little desorption or nitrification of excess nitrogen stored in the reach. There was no evidence of nitrogen limitation as measured by weight loss, oxygen consumption, phosphorus content, and macroinvertebrate density of red oak leaf packs, or by chlorophyll content and aufwuchs biomass on plexiglass slides. A continuous phosphorus enrichment 1 year earlier had demonstrated phosphorus limitation in Walker Branch. 38 references, 6 figures, 3 tables.}
doi = {10.1111/j.1365-2427.1983.tb00671.x}
journal = {Freshwater Biol.; (United Kingdom)}
volume = {13}
journal type = {AC}
place = {United Kingdom}
year = {1983}
month = {Jan}
}