Biogeochemistry 3

Session 39 (Contributed)
Wednesday, June 9, 1:00 PM-2:45 PM, IRC2
Moderator: S. Findlay

1:00 (259) The geomorphic influence of agricultural land use on hydrology and biogeochemical function in small streams.
R.A. Payn¹, H.M. Valett¹, J.R. Webster¹, J.A. Spotila², and P. Diplas³. ¹Department of Biology, Virginia Tech, Blacksburg, VA 24061, ²Department of Geology, Virginia Tech, Blacksburg, VA 24061, ³Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA 24061

1:15 (260) Phosphorus uptake, channel geometry, and sediment size before and after small dam removal in Boulder Creek, Wisconsin.
C.H. Orr¹, K.L. Rogers¹, N.R. Lottig², and E.H. Stanley¹. ¹Center for Limnology, University of Wisconsin, Madison, Wisconsin, USA 53706, ²Department of Biology, Virgninia Tech, Blacksburg, Virgnia, USA 24061

1:30 (261) The role of denitrification in nitrate removal determined using a ¹⁵N tracer approach.
J.L. Tank¹, M.J. Bernot¹, and S.K. Hamilton². ¹Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556, ²Kellogg Biological Station, Michigan State University, Hickory Corners, MI 49060

1:45 (262) Nitrate mass balance in a karstic, groundwater-dominated stream enriched with agricultural nitrate.
F.J. Triska¹, A.P. Jackman², J.H. Duff¹, J. Tesoriero³, and R.J. Avanzino¹. ¹U.S. Geological Survey, Water Resources, 345 Middlefield Rd. MS 439, Menlo Park CA 94025, ²University of California, Dept of Chemical Engineering, Davis CA 95616, ³U. S. Geological Survey, Water Resources, 3916 Sunset Ridge Road, Raleigh, NC 27607

2:00 (263) Nitrate dynamics in stream hyporheic zones assessed using ¹⁵N–N₃O tracer.
C.L. Crenshaw¹, A.D. Pershall¹, C.N. Dahm¹, R.W. Sheibley², N.B. Grimm², and L.H. Zeglin¹. ¹Department of Biology, University of New Mexico, Albuquerque, New Mexico 87131, ²Department of Biology, Arizona State University, Tempe, Arizona 85287

2:15 (264) Methods of measuring nutrient spiraling in urban streams.
R.W. Sheibley¹, N.B. Grimm¹, C.L. Crenshaw², C.N. Dahm², H. Van Vleck¹, A.D. Pershall², and L.H. Zeglin². ¹Arizona State University, Department of Ecology, Evolution and Environmental Sciences, Tempe AZ 85281, ²University of New Mexico, Department of Biology, Albuquerque, NM

2:30 (265) The influence of land use on biofilm nutrient limitation across 8 North American biomes.
L.C. Taylor¹, J.L. Tank¹, W.K. Dodds², and K.C. Wilson². ¹Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556, ²Division of Biology, Kansas State University, Manhattan, KS 66506