Biogeochemistry 2

Session 33 (Contributed)
Wednesday, June 9, 10:15 AM-12:00 PM, IRC2
Moderator: J. Tank

10:15 (217) The fate of nitrate in three Kansas streams: A stable isotope experiment.
J.M. O’Brien, W.K. Dodds, and K.C. Wilson. Division of Biology, Kansas State University, Manhattan, Kansas 66506 U.S.

10:30 (218) Regulation of denitrification by nitrate availability in a large river system.
J.C. Cavanaugh^1,2, W.B. Richardson², E.A. Strauss^1,2, L.A. Bartsch², and R.M. Kreiling^1,2. ¹River Studies Center, University of Wisconsin-La Crosse, La Crosse, WI 54601, ²Upper Midwest Environmental Sciences Center, US Geological Survey, La Crosse, WI 54603

10:45 (219) The effects of geomorphic controls on denitrification rates in agricultural streams of east-central Illinois .
M.R. Opdyke¹, M.B. David¹, and B.L. Rhoads². ¹Department of NRES, University of Illinois, Urbana, Illinois 61801, ²Geography Department, University of Illinois, Urbana, Illinois 61801

11:00 (220) Management changes interact with flash floods to flip nutrient limitation from P to N in a series of urban desert lakes.
W.J. Roach¹ and N.B. Grimm². ¹School of Life Sciences & IGERT in Urban Ecology, Arizona State University, Box 874501, Tempe, AZ, 85287-4501, ²School of Life Sciences & Center for Environmental Studies, Arizona State University, Box 874501, Tempe, AZ, 85287-4501

11:15 (221) Nitrogen dynamics in streams along a gradient of agricultural development in New Zealand.
K.S. Simon¹, D.K. Niyogi², and C.R. Townsend³. ¹Department of Biology, James Madison University, Harrisonburg, VA 22807, ²Department of Biology, University of Missouri-Rolla, Rolla, MO 65409, ³Department of Zoology, University of Otago, Dunedin, New Zealand

11:30 (222) Effects of denitrification on nitrogen load in the Upper Mississippi River system.
E.A. Strauss, W.B. Richardson, J. Rogala, L.A. Bartsch, and J.C. Cavanaugh. US Geological Survey, Upper Midwest Environmental Sciences Center, La Crosse, Wisconsin, 54603, USA

11:45 (223) Nitrogen cycling and nitrate uptake in plant beds of the Upper Mississippi River.
L.A. Bartsch¹, W.B. Richardson¹, E.A. Strauss^1,2, J.C. Cavanaugh^1,2, and R.M. Kreiling^1,2. ¹United States Geological Survey, Upper Midwest Environmental Sciences Center, 2630 Fanta Reed Road, La Crosse Wisconsin, 54603, ²River Studies Center, University of Wisconsin-La Crosse, 1725 State Street, La Crosse Wisconsin, 54601