Thursday, August 7, 2008: 8:00 AM-11:30 AM
202 A, Midwest Airlines Center
OOS 18 - Ecohydrology: Integrating Current Knowledge of Water Flux Along the Soil-Plant-Atmosphere Continuum
The terrestrial water cycle functions across multiple spatial scales simultaneously, linking together the dynamics of soil-plant-atmosphere (SPA) processes and controls. These processes include water transport within the vadose soil zone and between soil and root systems, transport within plant vascular systems, and plant or soil water exchange with the atmosphere. Controls on these processes depend on biotic and abiotic interactions as affected by climatic and edaphic conditions, as well as species-specific anatomical and physiological responses to their environments. Studies focused on specific ecohydrological processes or controls have broad applicability for modeling; however, resource limitations often prevent cohesive, multidisciplinary studies that span across the SPA continuum. As such, individual research can be quite disconnected from the entire SPA continuum, which can lead to incomplete or inappropriate analyses and thereby hinder development of critical elements in models, model refinement, and validation. This session strives to bring those researchers together to integrate current knowledge from different perspectives into a holistic picture that could ultimately enhance progress toward better regional or global models that rely on understanding water flux at various scales. The session talks will loosely follow mechanisms and controls of water flux from soils through plants to the atmosphere, including modeling talks that link together processes governing water flux across scales. The session will be informative for all those studying water flux from aspects ranging across cellular to ecosystem scales.
Organizer:Jeffrey M. Warren, Oak Ridge National Laboratory
Co-organizers:Frederick C. Meinzer, USDA Forest Service
Stan D. Wullschleger, Oak Ridge National Laboratory
Moderator:Stan D. Wullschleger, Oak Ridge National Laboratory
8:00 AMThe role of soil-water transport dynamics in the spatial distribution of plant-available water
John M. Norman, University of Wisconsin - Madison, Christine Molling, University of wisconsin - Madison
8:20 AMHydraulic redistribution of soil water by roots and fungal symbionts
José I. Querejeta, Centro de Edafología y Biología Aplicada del Segura (CEBAS-CSIC), Louise M. Egerton-Warburton, Chicago Botanic Garden, Michael F. Allen, University of California Riverside
8:40 AMHydro-physiological response to drought by trees developed under elevated CO2
Jeffrey M. Warren, Oak Ridge National Laboratory, Richard J. Norby, Oak Ridge National Laboratory, Stan D. Wullschleger, Oak Ridge National Laboratory
9:00 AMLeaf hydraulic regulation of water flux in Douglas-fir
David R. Woodruff, USDA Forest Service, Frederick C. Meinzer, USDA Forest Service, Barbara Lachenbruch, Oregon State University, Katherine McCulloh, Oregon State University, Jeffrey M. Warren, Oak Ridge National Laboratory, Daniel M. Johnson, USDA Forest Service
9:20 AMEcosystem metabolic variability associated with meteorology, physiology, phenology, and water supply
Darrel Jenerette, University of California Riverside, Russell Scott, United States Department of Agriculture, Agricultural Research Service, Greg Barron-Gafford, University of Arizona, Travis E. Huxman, University of Arizona
9:40 AMBreak
9:50 AMDiurnal and seasonal variation in canopy transpiration among evergreen and deciduous species
Chelcy Ford, USDA Forest Service, Robert M. Hubbard, USDA Forest Service, Brian D. Kloeppel, University of Georgia, James M. Vose, USDA Forest Service
10:10 AMImproving models of ecosystem water use in time and space by incorporating hydraulic controls over canopy stomatal conductance
Brent E. Ewers, University of Wyoming, D. Scott Mackay, SUNY-Buffalo, Michael M. Loranty, SUNY-Buffalo, Julia L. Angstmann, University of Wyoming, Sudeep Samanta, Woods Hole Research Center, Kusum Naithani, University of Wyoming, Bhaskar Mitra, SUNY-Buffalo
10:30 AMModelled changes in tree water use and primary production in response to predicted climate change in a temperate woodland, south-eastern Australia
Melanie Zeppel, University of Technology, Sydney, Catriona Macinnis-Ng, University of Technology, Sydney, Derek Eamus, University of Technology, Sydney
10:50 AMPlant eco-physiological response patterns to summer drought, elevated CO2, and warming in a semi-natural temperate heath ecosystem
Kristian Rost Albert, University of Copenhagen, Teis N. Mikkelsen, Risø National Laboratory for Sustainable Energy, Technical University of Denmark, Helge Ro-Poulsen, University of Copenhagen, Anders Michelsen, University of Copenhagen
11:10 AMThe response of co-occurring species to seasonal and protracted drought
William T. Pockman, University of New Mexico, Enrico A. Yepez, University of New Mexico, Jennifer Plaut, University of New Mexico, Judson P. Hill, University of New Mexico, James R. Elliott, University of New Mexico, Jennifer E. Johnson, University of New Mexico, Eric E. Small, University of Colorado, Nate G. McDowell, Los Alamos National Laboratory

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See more of The 93rd ESA Annual Meeting (August 3 -- August 8, 2008)