Nitrogen Cycling In A Forest Stream Determined By A 15N Tracer Addition. Mulholland, P. J., Tank, J., Sanzone, D. M., Wollheim, W. M., Peterson, B., Webster, J., & Meyer, J. Ecological Monographs, 2000. ![Nitrogen Cycling In A Forest Stream Determined By A 15N Tracer Addition. [pdf]](https://bibbase.org/img/filetypes/pdf.svg "pdf")
Paper abstract bibtex Nitrogen uptake and cycling was (5-6 min) and ammonium uptake lengths (23-27 m) were short and relatively constant during the addition. Uptake rates of NH4 were more variable, ranging from 22 to 37 mg/L). The highest rates of ammonium uptake per unit area were by the liverwort Porella pinnata, decomposing leaves, and fine benthic organic matter (FBOM), although epilithon had the highest N uptake per unit biomass N. Nitrification rates and nitrate uptake lengths and rates were determined by fitting nitrification/nitrate uptake model to the longitudinal profiles of 15N-NO3 flux. Nitrification was an important sink for ammonium in stream water, accounting for 19% of the total ammonium uptake rate. Nitrate production via coupled regeneration/nitrification of organic N was about on-half as large as nitrification of streamwater ammonium. Nitrate uptake lengths were longer and more variable that those for ammonium, ranging from 101 m to infinity. Nitrate uptake rate varied from 0 to 29 mg+m-2+min-1 and was \textasciitilde1.6 times greater than assimilatory ammonium uptake rate early in the tracer addition. A sixfold decline in instream gross primary production rate resulting from a sharp decline in light level with leaf emergence had little effect on ammonium uptake rate but reduced nitrate uptake rate by nearly 70%. At the end of the addition, 64-79% of added 15N was accounted for either in biomass within the 125-m stream reach (33-48%) or as export of 15N-NH4 (4%), 15N-NO3 (23%), and fine particulate organic matter (4%) from the reach. Much of the 15N not accounted fro was probably lost downstream as transport of particulate organic N during a storm midway through the experiment or as dissolved organic N produced with the reach. Turnover rates of a large portion of the 15N taken up by biomass compartments are high (0.04-0.08 per day), although a substantial portion of the 15N in Porella (34%), FBOM (21%), and decomposing wood (17%) at the end of the addition was retained 75 d later, indicating relatively long-term retention of some N taken up from water. In total, our results showed that ammonium retention and nitrification rates were high in Walker Branch, and that the downstream loss of N was primarily as nitrate and was controlled largely by nitrification, assimilatory demand for N, . of the complex processes controlling N cycling and loss in ecosystem.
@article{mulholland_nitrogen_2000,
title = {Nitrogen {Cycling} {In} {A} {Forest} {Stream} {Determined} {By} {A} 15N {Tracer} {Addition}.},
volume = {70},
url = {http://cwt33.ecology.uga.edu/publications/1399.pdf},
abstract = {Nitrogen uptake and cycling was (5-6 min) and ammonium uptake lengths (23-27 m) were short and relatively constant during the addition. Uptake rates of NH4 were more variable, ranging from 22 to 37 mg/L). The highest rates of ammonium uptake per unit area were by the liverwort Porella pinnata, decomposing leaves, and fine benthic organic matter (FBOM), although epilithon had the highest N uptake per unit biomass N. Nitrification rates and nitrate uptake lengths and rates were determined by fitting nitrification/nitrate uptake model to the longitudinal profiles of 15N-NO3 flux. Nitrification was an important sink for ammonium in stream water, accounting for 19\% of the total ammonium uptake rate. Nitrate production via coupled regeneration/nitrification of organic N was about on-half as large as nitrification of streamwater ammonium. Nitrate uptake lengths were longer and more variable that those for ammonium, ranging from 101 m to infinity. Nitrate uptake rate varied from 0 to 29 mg+m-2+min-1 and was {\textasciitilde}1.6 times greater than assimilatory ammonium uptake rate early in the tracer addition. A sixfold decline in instream gross primary production rate resulting from a sharp decline in light level with leaf emergence had little effect on ammonium uptake rate but reduced nitrate uptake rate by nearly 70\%. At the end of the addition, 64-79\% of added 15N was accounted for either in biomass within the 125-m stream reach (33-48\%) or as export of 15N-NH4 (4\%), 15N-NO3 (23\%), and fine particulate organic matter (4\%) from the reach. Much of the 15N not accounted fro was probably lost downstream as transport of particulate organic N during a storm midway through the experiment or as dissolved organic N produced with the reach. Turnover rates of a large portion of the 15N taken up by biomass compartments are high (0.04-0.08 per day), although a substantial portion of the 15N in Porella (34\%), FBOM (21\%), and decomposing wood (17\%) at the end of the addition was retained 75 d later, indicating relatively long-term retention of some N taken up from water. In total, our results showed that ammonium retention and nitrification rates were high in Walker Branch, and that the downstream loss of N was primarily as nitrate and was controlled largely by nitrification, assimilatory demand for N, . of the complex processes controlling N cycling and loss in ecosystem.},
number = {3},
journal = {Ecological Monographs},
author = {Mulholland, Patrick J. and Tank, J.L. and Sanzone, D. M. and Wollheim, Wilfred M. and Peterson, B.J. and Webster, J.R. and Meyer, J.L.},
year = {2000},
keywords = {CWT}
}
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The highest rates of ammonium uptake per unit area were by the liverwort Porella pinnata, decomposing leaves, and fine benthic organic matter (FBOM), although epilithon had the highest N uptake per unit biomass N. Nitrification rates and nitrate uptake lengths and rates were determined by fitting nitrification/nitrate uptake model to the longitudinal profiles of 15N-NO3 flux. Nitrification was an important sink for ammonium in stream water, accounting for 19% of the total ammonium uptake rate. Nitrate production via coupled regeneration/nitrification of organic N was about on-half as large as nitrification of streamwater ammonium. Nitrate uptake lengths were longer and more variable that those for ammonium, ranging from 101 m to infinity. Nitrate uptake rate varied from 0 to 29 mg+m-2+min-1 and was \\textasciitilde1.6 times greater than assimilatory ammonium uptake rate early in the tracer addition. A sixfold decline in instream gross primary production rate resulting from a sharp decline in light level with leaf emergence had little effect on ammonium uptake rate but reduced nitrate uptake rate by nearly 70%. At the end of the addition, 64-79% of added 15N was accounted for either in biomass within the 125-m stream reach (33-48%) or as export of 15N-NH4 (4%), 15N-NO3 (23%), and fine particulate organic matter (4%) from the reach. Much of the 15N not accounted fro was probably lost downstream as transport of particulate organic N during a storm midway through the experiment or as dissolved organic N produced with the reach. Turnover rates of a large portion of the 15N taken up by biomass compartments are high (0.04-0.08 per day), although a substantial portion of the 15N in Porella (34%), FBOM (21%), and decomposing wood (17%) at the end of the addition was retained 75 d later, indicating relatively long-term retention of some N taken up from water. In total, our results showed that ammonium retention and nitrification rates were high in Walker Branch, and that the downstream loss of N was primarily as nitrate and was controlled largely by nitrification, assimilatory demand for N, . of the complex processes controlling N cycling and loss in ecosystem.","number":"3","journal":"Ecological Monographs","author":[{"propositions":[],"lastnames":["Mulholland"],"firstnames":["Patrick","J."],"suffixes":[]},{"propositions":[],"lastnames":["Tank"],"firstnames":["J.L."],"suffixes":[]},{"propositions":[],"lastnames":["Sanzone"],"firstnames":["D.","M."],"suffixes":[]},{"propositions":[],"lastnames":["Wollheim"],"firstnames":["Wilfred","M."],"suffixes":[]},{"propositions":[],"lastnames":["Peterson"],"firstnames":["B.J."],"suffixes":[]},{"propositions":[],"lastnames":["Webster"],"firstnames":["J.R."],"suffixes":[]},{"propositions":[],"lastnames":["Meyer"],"firstnames":["J.L."],"suffixes":[]}],"year":"2000","keywords":"CWT","bibtex":"@article{mulholland_nitrogen_2000,\n\ttitle = {Nitrogen {Cycling} {In} {A} {Forest} {Stream} {Determined} {By} {A} 15N {Tracer} {Addition}.},\n\tvolume = {70},\n\turl = {http://cwt33.ecology.uga.edu/publications/1399.pdf},\n\tabstract = {Nitrogen uptake and cycling was (5-6 min) and ammonium uptake lengths (23-27 m) were short and relatively constant during the addition. Uptake rates of NH4 were more variable, ranging from 22 to 37 mg/L). The highest rates of ammonium uptake per unit area were by the liverwort Porella pinnata, decomposing leaves, and fine benthic organic matter (FBOM), although epilithon had the highest N uptake per unit biomass N. Nitrification rates and nitrate uptake lengths and rates were determined by fitting nitrification/nitrate uptake model to the longitudinal profiles of 15N-NO3 flux. Nitrification was an important sink for ammonium in stream water, accounting for 19\\% of the total ammonium uptake rate. Nitrate production via coupled regeneration/nitrification of organic N was about on-half as large as nitrification of streamwater ammonium. Nitrate uptake lengths were longer and more variable that those for ammonium, ranging from 101 m to infinity. Nitrate uptake rate varied from 0 to 29 mg+m-2+min-1 and was {\\textasciitilde}1.6 times greater than assimilatory ammonium uptake rate early in the tracer addition. A sixfold decline in instream gross primary production rate resulting from a sharp decline in light level with leaf emergence had little effect on ammonium uptake rate but reduced nitrate uptake rate by nearly 70\\%. At the end of the addition, 64-79\\% of added 15N was accounted for either in biomass within the 125-m stream reach (33-48\\%) or as export of 15N-NH4 (4\\%), 15N-NO3 (23\\%), and fine particulate organic matter (4\\%) from the reach. Much of the 15N not accounted fro was probably lost downstream as transport of particulate organic N during a storm midway through the experiment or as dissolved organic N produced with the reach. Turnover rates of a large portion of the 15N taken up by biomass compartments are high (0.04-0.08 per day), although a substantial portion of the 15N in Porella (34\\%), FBOM (21\\%), and decomposing wood (17\\%) at the end of the addition was retained 75 d later, indicating relatively long-term retention of some N taken up from water. 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