Wednesday, August 8, 2007: 8:00 AM-11:30 AM
C3&4, San Jose McEnery Convention Center
OOS 25 - Ecosystem responses to experimental warming and other global climate change factors
This session will present research results from warming and global change experiments. To develop predictive understanding of climate warming impacts on terrestrial ecosystems, many warming experiments have been conducted in the past two decades and in a variety of ecosystems. The longest field study, addressing soil warming at Harvard Forest, has been ongoing since 1991. The Network of Ecosystem Warming Studies (NEWS) organized by the international consortium, Terrestrial Ecosystem Response to Atmospheric and Climate Change (TERACC) includes at least 35 experimental sites. Stimulated by new funding opportunities, more warming experiments with other climate change factors have recently been initiated. As the ongoing warming experiments continue and new multi-factor experiments have been established, many experimental results are available to examine effects of warming and other factors on ecosystem function and community structure across a wide spectrum of time and space scales. In addition, modeling studies actively examine the complexity of ecosystem responses to climate change. Presentations on these topics by representatives of research groups working in diverse ecosystems are brought together here to foster synergistic interaction among researchers using warming experiments in climate change research. Studies reported here have used warming experiments alone or in combination with modification of other climate factors (such as elevated CO2, altered precipitation, and/or increased N inputs), or have used modeling to integrate experimental studies of global change impacts on ecosystems.
Organizer:Xuhui Zhou, University of Oklahoma
Co-organizer:Yiqi Luo, University of Oklahoma
Moderator:Xuhui Zhou, University of Oklahoma
8:00 AMOOS 25-1Effects of warming on ecosystems: What don't we know?
Christopher B. Field, Carnegie Institution of Washington, Nona R. Chiariello, Stanford University
8:20 AMOOS 25-2Annual grassland response to altered precipitation and temperature: Genes, species, and ecosystem
Margaret S. Torn, Berkeley Lab and UC Berkeley, Samuel B. St.Clair, UC Berkeley, David Ackerly, Berkeley Lab and UC Berkeley, Gary L. Andersen, Berkeley Lab, Stephanie M. Bernard, Berkeley Lab, Eoin L. Brodie, Berkeley Lab, Cristina Castanha, Berkeley Lab, Mary K. Firestone, Berkeley Lab and UC Berkeley, Marc L. Fischer, Berkeley Lab, Donald J. Herman, UC Berkeley, Francesca M. Hopkins, Berkeley Lab, Sarah A. Placella, UC Berkeley, Rohit Salve, Berkeley Lab
8:40 AMOOS 25-3Understanding belowground processes in a multifactor world: Interactive effects of atmospheric carbon dioxide, temperature, and soil moisture
Aimee T. Classen, Oak Ridge National Laboratory, Charles T. Garten Jr., Oak Ridge National Laboratory, Richard J. Norby, Oak Ridge National Laboratory, Jake F. Weltzin, University Of Tennessee
9:00 AMOOS 25-4Non-additive effects of day- and night-time warming on ecosystem C fluxes in a temperate steppe
Shuli Niu, Chinese Academy of Sciences
9:20 AMOOS 25-5Interactive effects of warming and altered rainfall timing on ecosystem processes in tallgrass prairie
John M. Blair, Kansas State University, Philip A. Fay, USDA ARS, Alan K. Knapp, Colorado State University, Melinda D. Smith, Yale University, Jonathon D Carlisle, Kansas State University
9:40 AM Break
9:50 AMOOS 25-6"Night"-warming a misnomer: Whole ecosystem gas exchange also affected by concomitantly warmer mornings for reconstructed prairie ecosystems
Jillian W. Gregg, Terrestrial Ecosystems Research Associates
10:10 AMOOS 25-7Warming and rainfall redistribution alters tree-grass interactions in oak savanna
Mark G. Tjoelker, Texas A&M University, David D. Briske, Texas A&M University, Astrid Volder, Texas A&M University
10:30 AMOOS 25-8Transient and cumulative impacts of experimental increases in temperature and N-deposition in subalpine meadows
Richard A. Gill, Washington State University
10:50 AMOOS 25-9Heating the tundra: Experimental warming results from the International Tundra Experiment (ITEX)
Greg H. R. Henry, University of British Columbia

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