OOS 47 - From Leaf to Biosphere: The Effects of a Warming Climate on Tropical Rain Forests

Friday, August 12, 2011: 8:00 AM-11:30 AM
17A, Austin Convention Center
Organizer: Tana E. Wood
Co-organizers: Molly A. Cavaleri and Sasha C. Reed
Moderator: Tana E. Wood
Tropical forests play a large role in the global carbon cycle as well as the world’s climate. They contain ~25% of Earth’s terrestrial biomass, are responsible for a third of terrestrial net primary production, and exchange more carbon and energy with the atmosphere than any other biome. Accordingly, climate-induced effects on tropical rain forests could dramatically affect atmospheric CO2 concentrations and feedback to affect climate change. Nevertheless, due to the diversity of the tropical biome and a paucity of manipulative studies, we have a relatively poor understanding of how increasing temperatures will affect tropical rain forest structure and function. Over the last decade, discussions of the primary forces affecting tropical rain forests have been heated, with all sides giving valid evidence for and against contradicting theories. The diversity of trajectories in tropical forests may be as diverse as the forests themselves, and the primary drivers of change may depend on multiple different limiting and interacting factors. While it is very important to understand the effects of multiple drivers simultaneously, we propose that a way forward is to begin to focus on individual drivers first. We aim to bring speakers together to address the issue of how increasing temperature could affect tropical rain forests, and we have assembled a speaker list that will allow us to address this question from the microbial- to the biome-scale. For example, speakers will consider the temperature sensitivity of heterotrophic respiration, tree growth and mortality responses to seemingly subtle temperature changes, and how interactions between climate and nutrient cycles could regulate above- and belowground responses to climate change. In addition, these original research presentations will contribute to a larger, coherent theme, focusing on the question of how we may expect increasing temperature to affect tropical forest organisms, biogeochemical cycles, and overall ecosystem health. We hope to use this collection of speakers to consider and highlight new research directions that both build upon the work presented as well as highlight novel avenues of investigation. Together these talks will provide a comprehensive exploration of how tropical forests are currently responding to temperature increases, will help with predictions of how these forests may respond in the future, and will highlight key factors controlling their response. We hope this session will offer insight into how and why increasing temperatures affect tropical forests, and that it will prove rewarding for scientists, decision makers, and land managers alike.
8:00 AM
Tropical soil microbial community response to experimental warming
Devin Wixon, University of Wisconsin, Madison; A. Peyton Smith, University of Wisconsin-Madison; Teri C. Balser, University of Florida-Gainesville
8:40 AM
Climate and nutrient regulation of the tropical forest carbon cycle
Cory C. Cleveland, University of Montana; Alan R. Townsend, University of Colorado at Boulder; Silvia Alvarez-Clare, The University of Montana; Mercedes MMC Bustamante, Universidade de Brasilia; George B. Chuyong, University of Buea; Solomon Dobrowski, University of Montana; Pauline Grierson, The University of Western Australia; Kyle E. Harms, Louisiana State University; Benjamin Z. Houlton, University of California, Davis; Alison R. Marklein, University of California - Davis; William J. Parton, Colorado State University; Stephen Porder, Brown University; Sasha C. Reed, U.S. Geological Survey; Carlos Sierra, Max-Planck-Institute for Biogeochemistry; Whendee L. Silver, University of California, Berkeley; E.V.J. Tanner, University of Cambridge; Philip G. Taylor, Duke University; William R. Wieder, University of Colorado, Boulder
9:00 AM
Physiological clues to the responses of tropical rainforest trees to a warming climate
Shaun C. Cunningham, Monash University; Jennifer Read, Monash University
9:20 AM
Modeling the complex effects of climatic variation on tropical rainforest carbon cycling
Ann E. Russell, Iowa State University; William J. Parton, Colorado State University; Steven F. Oberbauer, Florida International University
9:40 AM
9:50 AM
The response of tropical forest function and carbon cycling to warming: Insights from an elevation transect study in the Andes and Amazon
Yadvinder Malhi, University of Oxford; Patrick Meir, University of Edinburgh; Norma Salinas, Universidad San Antonio Abad del Cusco; Javier Silva-Espejo, Universidad San Antonio Abad del Cusco; Cecile Girardin, University of Oxford; Michael Zimmerman, James Cook University; Luiz EO Aragao, University of Exeter; Daniel B. Metcalfe, Swedish University of Agricultural Sciences; Filio Farfan-Amezquita, Universidad San Antonio Abad del Cusco; Walter Huaraca-Huasco, Universidad San Antonio Abad del Cusco; Liliana Durand, Universidad San Antonio Abad del Cusco; Marlene Mamani, Universidad San Antonio Abad del Cusco; Adan JQ Ccahuana, Universidad San Antonio Abad del Cusco; Christopher Doughty, University of Oxford; William Farfan, Wake Forest University; Karina Garcia, Wake Forest University; Amanda Robertson, University of Alaska; Kenneth J. Feeley, Fairchild Tropical Botanical Garden; Michael Bird, James Cook University; Miles R. Silman, Wake Forest University
10:10 AM
10:30 AM
Tropical forest carbon balance in a warmer world: A critical review spanning microbial- to ecosystem-scale processes
Tana E. Wood, USDA Forest Service; Molly A. Cavaleri, Michigan Technological University; Sasha C. Reed, U.S. Geological Survey
10:50 AM
Temporal patterns of net CO2 exchange for a tropical semi-deciduous forest of the southern Amazon Basin
George L. Vourlitis, California State University; Francisco de Almeida Lobo, Universidade Federal de Mato Grosso; Peter A. Zeilhofer, 3Programa de Pós-Graduação em Física Ambiental; Jose de Souza Nogueira, Universidade Federal de Mato Grosso
11:10 AM
Increasing liana abundance and biomass in tropical forests: Emerging patterns and putative mechanisms
Stefan A. Schnitzer, University of Wisconsin - Milwaukee; Frans Bongers, Wageningen University
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