Friday, August 10, 2007: 8:00 AM-11:30 AM
Almaden Blrm I, San Jose Hilton
COS 153 - Nutrient cycling: Limiting resources, interactions, and ecosystem restoration
8:00 AMCOS 153-1Ecosystem response to the urban atmosphere in the Sonoran desert
Sharon J. Hall, Arizona State University, Ryan Sponseller, Arizona State University, Nancy Grimm, Arizona State University, Jason P. Kaye, Pennsylvania State University, Jonathan Allen, Arizona State University
8:20 AMCOS 153-2Soil nutrient pools and dynamics across a gradient of human influence
Rachel C. Davies, Arizona State University, Sharon J. Hall, Arizona State University
8:40 AMCOS 153-3Phosphorus and cation losses as a function of soil age and climate in the Hawaiian Islands
Stephen Porder, Brown University, Oliver A. Chadwick, University of California, Santa Barbara, George E. Hilley, Stanford University
9:00 AMCOS 153-4Ecosystem impacts of invasion by an N-fixing tree in Hawaii: Sure, ecosystem nitrogen stocks increase, but what about stocks of phosphorus?
Flint Hughes, USDA Forest Service, Amanda Uowolo, USDA Forest Service
9:20 AMCOS 153-5Hawaiian agriculture prior to Cook: Sources of nutrients to windward agricultural systems
Peter M. Vitousek, Stanford University, Molly A. Palmer, Stanford University, Oliver A. Chadwick, University of California, Anthony S. Hartshorn, University of California, Thegn N. Ladefoged, Auckland University, Michael W. Graves, University of New Mexico, Ka`eo Duarte, Kamehameha Schools
9:40 AM Break
9:50 AMCOS 153-6Spatial variation in the coupling of nitrogen and phosphorus uptake in stream ecosystems
John D. Schade, St. Olaf College, Camille McNeely, Eastern Washington University, Steve A. Thomas, University of Nebraska-Lincoln, Jill R. Welter, College of St. Catherine, Jacques C. Finlay, University of Minnesota, Mary E. Power, University of California, Berkeley
10:10 AMCOS 153-7Soil and plant 15N values reveal ecosystem nitrogen dynamics and indicate niche partitioning for soil nitrogen among plant species
Ansgar Kahmen, UC Berkeley, Wolfgang Wanek, University of Vienna, Nina Buchmann, ETH Zurich, Switzerland
10:30 AMCOS 153-8Competition for nitrogen across a rainfall gradient: Interaction between nitrogen and water can lead to coexistence on a single limiting resource
Katherine A. Everard, Imperial College, Silwood Park, Claire De Mazancourt, McGill University, Eric W. Seabloom, Oregon State University, W. Stanley Harpole, University of California, Irvine

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