OOS 11 - Multi-Factor Global Change Experiments: What Have We Learned about Terrestrial Carbon Storage and Exchange?

Tuesday, August 9, 2011: 8:00 AM-11:30 AM
14, Austin Convention Center
Organizer: Pamela H. Templer
Moderator: Andrew B. Reinmann
Interest in understanding the mechanisms controlling carbon storage and loss in terrestrial ecosystems has increased significantly recently as these ecosystems are a major, yet vulnerable sink for carbon. Climate projections indicate that mean annual temperatures will warm throughout the globe over the next century. These warmer temperatures are expected to alter precipitation in many parts of the globe, with variable changes in the intensity, timing, quantity and form of precipitation in different regions. At the same time that temperatures and precipitation are changing, terrestrial ecosystems are experiencing other alterations, such as increases in availability of nitrogen, increased concentrations of carbon dioxide in the atmosphere and changes in trophospheric ozone. Numerous studies have shown that both single- and multifactor manipulations of temperature or precipitation can lead to dramatic effects on ecosystem carbon dynamics. However, the magnitude and direction of response to these manipulations are often not predictable based on changes in individual factors due to additive vs. synergistic response patterns. The majority of mutli-factor experiments have been conducted in grass- or shrubland ecosystems, where the small stature of the vegetation makes costly global change manipulations more feasible. Fewer have been conducted in forest ecosystems, even though they are important to understand due to their role in carbon storage. Although past sessions have focused on multi-factor experiments (see “Mucking through multifactor experiments: design and analysis of multifactor studies in global change research” from the 2006 ESA meeting), several recent studies have evaluated the effects of these treatments on carbon storage and exchange that could add to our understanding of these key processes. Here we propose to lead an organized oral session at the 2011 Ecological Society of America meeting to bring together ecosystem-scale experiments and modeling efforts across a wide geographic range of ecosystem types. Our session will include two types of talks. The first set will showcase experimental efforts among many ecosystem types and the second set will focus on modeling studies. Together, these talks will show how empirical work and modeling efforts can inform each other to transform our thinking about the impacts of climate change on terrestrial carbon sinks and exchange. Through these topics, we will address questions about the effects of climate change on the hydrology, biology and chemistry of terrestrial ecosystems.
8:00 AM
Responses and feedbacks of coupled biogeochemical cycles to global change
Adrien C. Finzi, Boston University; John E. Drake, University of Western Sydney
8:20 AM
Impacts of environmental and atmospheric changes on carbon storage and exchange in upland deciduous forests: Current patterns and future possibilities
Paul J. Hanson, Oak Ridge National Laboratory; Stan D. Wullschleger, Oak Ridge National Laboratory; Richard J. Norby, Oak Ridge National Laboratory; Carla Gunderson, Oak Ridge National Laboratory
8:40 AM
Responses of net ecosystem CO2 exchange and plant biomass to warming and nitrogen addition in a temperate grass-dominated system
Hugh A.L. Henry, University of Western Ontario; Min Ku Kim, University of Western Ontario
9:00 AM
Effects of elevated temperature and additional growing season precipitation on managed grassland carbon storage and flux
Rebecca L. McCulley, University of Kentucky; Jim A. Nelson, University of Kentucky; Elizabeth A. Carlisle, University of Kentucky
9:20 AM
Carbon dynamics in an oldfield ecosystem: Was a multi-factor experiment the best approach for revealing responses to atmospheric and climatic change?
Richard J. Norby, Oak Ridge National Laboratory; Jake F. Weltzin, US Geological Survey; Paul Kardol, Swedish University of Agricultural Sciences; Colleen M. Iversen, Oak Ridge National Laboratory; Shiqiang Wan, Henan University; Charles T. Garten Jr., Oak Ridge National Laboratory; Aimee T. Classen, University of Tennessee, Knoxville
9:40 AM
10:10 AM
How do soil respiration and its sensitivity to temperature change with different warming experiments? 
Jianwu Tang, Marine Biological Laboratory; Timothy Savas, Marine Biological Laboratory; Skyler Hackley, Marine Biological Laboratory; Xi Yang, Brown University; Jerry M. Melillo, Marine Biological Laboratory; Shannon Pelini, Harvard University; Aaron Ellison, Harvard University
10:30 AM
Biochemical inventory as a tool to assay ecosystem carbon dynamics
William C. Hockaday, Baylor University; Morgan E. Gallagher, Rice University; Caroline A. Masiello, Rice University, Houston, TX; H. Wayne Polley, USDA, Agricultural Research Service; Jeff A. Baldock, CSIRO Land and Water; Lacey A. Pyle, University of Texas
See more of: Organized Oral Session
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Banner photo by Flickr user greg westfall.