95th ESA Annual Meeting (August 1 -- 6, 2010)

OOS 5 - Long-term Warming Experiment: What We Have Learned and What is Unknown

Monday, August 2, 2010: 1:30 PM-5:00 PM
310-311, David L Lawrence Convention Center
Jianwu Tang
Jerry M. Melillo and Yiqi Luo
Jianwu Tang
Large-scale long-term manipulative experiments have been effective in studying ecosystem responses to one or more drivers under a control condition. The warming experiment mimics the global warming by increasing either soil temperature or whole-ecosystem temperature to a certain degree. The warming experiment helps us understand the change of biogeochemical cycles and ecosystems functions in response to warming, and helps validate ecosystem models that can predict the future change under the warming condition. The warming experiment has been started since early 1990’s. The published literature indicates that ecosystem responses to long-term warming are more complex that we expected. For example, soil respiration will increase with warming without much surprise. However, the sensitivity of soil respiration to warming may change over time with the mechanism of acclimation and adaptation unknown. Furthermore, the components of photosynthesis, plant respiration, and microbial respiration in response differently to warming are unclear. The coupling of carbon and nitrogen cycles under warming is far from clear. The purpose of this Session is to bring scientists conducting the warming experiment worldwide together to address what we have learned from the warming experiment, what is unknown, and what is the future direction and challenge in conducting the warming experiment. We expect to conduct synthesis work across the sites and publish a special issue of journal papers following the Session.
1:30 PM
Effects of soil warming on the carbon cycle at the Harvard Forest, Massachusetts, USA
Jerry M. Melillo, Marine Biological Laboratory; Sarah M. Butler, Marine Biological Laboratory; Rose M. Smith, Marine Biological Laboratory; Chelsea L. Vario, Marine Biological Laboratory; Andrew J. Burton, Michigan Technological University; Yumei Zhou, Shanghai Institute of Technology; Jianwu Tang, Marine Biological Laboratory; Jennifer E. Johnson, Stanford University; Jacqueline Mohan, University of Georgia
1:50 PM
Opening the black box on soil warming: Microbial response to simultaneous warming and nitrogen fertilization
Alexandra R. Contosta, University of New Hampshire; Serita Frey, University of New Hampshire; Melissa A. Knorr, University of New Hampshire
2:10 PM
Responses of an old-field ecosystem to twelve combinations of warming and precipitation
Jeffrey S. Dukes, Purdue University; Vidya Suseela, Clemson University; Susanne S. Hoeppner, Purdue University
2:30 PM
Forests of the future: Demographic responses of juvenile trees to soil warming at Harvard Forest
Jacqueline Mohan, University of Georgia; Jerry M. Melillo, Marine Biological Laboratory; Paul T. Frankson, University of Georgia; Sarah Butler, Marine Biological Laboratory; Katherine J. Lenoir, University of Georgia; Shafkat I. Khan, University of Georgia
2:50 PM
Warming responses of Arctic vegetation: Experiments and reality
Gaius Shaver, Marine Biological Laboratory
3:10 PM
3:20 PM
Responses of temperate steppe to climate warming and N enrichment along a precipitation gradient
Shiqiang Wan, Hebei University; Jianyang Xia, University of Oklahoma; Jixun Guo, Northeast Normal University; Guodong Han, Inner Mongolia Agricultural University; Keping Ma, Institute of Botany, Chinese Academy of Sciences
3:40 PM
Plant community structure and stability over ten years of warming and harvesting
Rebecca A. Sherry, University of Oklahoma; Linda L. Wallace, University of Oklahoma; Yiqi Luo, University of Oklahoma
See more of: Organized Oral Session