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Communication at the NABS Annual meeting, Keystone, 2000
(307) A COMPARISON OF NITROGEN PROCESSING IN THE P&G EXPERIMENTAL
STREAM FACILITY WITH NATURAL STREAMS IN THE LINX STUDY USING STABLE
ISOTOPES.
D.J. D'Angelo1, S.C. Christman1, B.J. Peterson2, P.J. Mulholland3, C.S. Fellows4, J.L. Tank5, S.K. Hamilton6, E. Marti7, L.R. Ashkenas8, W.B. Bowden9, W.K. Dodds10, W.B. McDowell11, J.L. Meyer12, and J.R. Webster13. 1The Procter & Gamble Co, Experimental Stream Facility, Milford, OH 45150, 2The Ecosystem Center, Marine Biological Laboratory, Woods Hole, MA 02543, 3Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN, 378313, 4Department of Biology, University of New Mexico, Albuquerque, NM 87131, 5Department of Natural Resources and Environmental Sciences, University of Illinois, N-411 Turner Hall, Urbana, IL, 61801, 6Kellogg Biological Station, Michigan State University, 3700 E Gull Creek Dr., Hickory Corners, MI, 49060, 7Department of Zoology, Arizona State University, Tempe, AZ, 85287, 8Department of Fisheries and Wildlife, Oregon State University, Corvallis, OR, 97331, 9Landcare Research, PO Box 69, Lincoln 8152, New Zealand, 10Division of Biology, Kansas State University, 232 Ackert Hall, Manhattan, KS, 66506, 11Department of Natural Resources, James Hall, University of New Hampshire, Durham, NH, 03824, 12Institute of Ecology, University of Georgia, Athens, GA, 30602, 13Department of Biology, Virginia Polytechnic Institute and State University, Blacksburg, VA, 24061
Stable isotopes releases of nitrogen (15NH4CL) were conducted in 9 streams as part of the LINX project and independently in the Procter & Gamble Experimental Streams and several other natural streams. The goal of LINX is to compare nitrogen processing in a range of streams and investigate the factors that govern nitrogen processing. The P&G experimental stream facility is used to test the effects of chemicals on stream ecosystems. Typically, experimental streams are evaluated at the population or community level with little examination of ecosystem functions such as nutrient processing. This project was designed to determine how processing of nitrogen in the P&G experimental streams compares to processing of nitrogen in natural streams throughout the US and other regions . Preliminary evaluations of nitrogen uptake show that the uptake rate of ammonium for the experimental streams (0.019 m-1) is similar to uptake rates in natural streams of similar flow and fits the regresssion of uptake length and discharge for the LINX streams. The relationship between the ESF and natural streams for other processes (e.g., transfer of nitrogen) is less transparent. However, values from the experimental streams fall within the range of values for the natural streams.
Presented at 2:00 PM on Thursday, June 1, 2000 in Nutrient Dynamics I
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