COS 21
Biogeochemistry: New Paradigms In Biogeochem Cycling II

Tuesday, August 6, 2013: 8:00 AM-11:30 AM
L100A, Minneapolis Convention Center
8:00 AM
 Estimating nitrogen fixation rates and controls in a tropical dry forest
Maria G. Gei, University of Minnesota; Jennifer S. Powers, University of Minnesota
8:20 AM
 Forest calcium depletion and biotic retention along a natural gradient of soil nitrogen
Steven Perakis, US Geological Survey; Emily R. Sinkhorn, Oregon State University; Christina Catricala, US Geological Survey; Thomas D. Bullen, U.S. Geological Survey; John Fitzpatrick, U.S. Geological Survey; Justin Hynicka, Oregon State University; Kermit Cromack Jr., Oregon State University
8:40 AM
 Variation in soil oxygen across an aquatic-terrestrial interface
Terry D. Loecke, University of Kansas; Amy J. Burgin, University of Nebraska - Lincoln
9:00 AM
 An ecosystem approach to understanding soil C in humid tropical forests: influences of minerals, microbes, and roots
Steven J. Hall, University of California-Berkeley; Whendee L. Silver, University of California, Berkeley
9:20 AM
 Soil denitrification fluxes and oxygen dynamics in three contrasting northeastern North American forests
Jennifer L. Morse, Portland State University; Fred Beall, Canadian Forest Service; Irena F. Creed, Western University; Eric Enanga, University of Western Ontario; Ivan J. Fernandez, University of Maine; Peter M. Groffman, Cary Institute of Ecosystem Studies
9:40 AM
9:50 AM
10:10 AM
 The role of ndividual tree nutrient demand and tree functional types in tropical rainforest nutrient limitation
Cleo B. Chou, Princeton University; Lars O. Hedin, Princeton University; Stephen W. Pacala, Princeton University
10:30 AM
 Widespread and ecologically meaningful rock nitrogen contributions to terrestrial ecosystems
Scott L. Morford, University of California, Davis; Benjamin Z. Houlton, University of California, Davis; Randy A. Dahlgren, University of California, Davis
10:50 AM
 Extraction of dissolved organic carbon from carbonate-rich lake sediments
Sean A. Marczewski, University of Minnesota; James B. Cotner, University of Minnesota - Twin Cities
11:10 AM
 Biogeochemical controls of symbiotic N2 fixation across broad spatial scales: An evaluation of four hypotheses
Sarah A. Batterman, Princeton University; Duncan N. L. Menge, Princeton University; Lars O. Hedin, Princeton University