Tuesday, August 3, 2010: 1:30 PM-5:00 PM
303-304, David L Lawrence Convention Center
OOS 16 - Global Change and Alpine Ecosystems: the Experience So Far and Looking Ahead
The session will present the state of the art of observational, experimental and modelling approaches used to study the impacts of global change drivers (climate, land use, atmospheric N deposition, elevated CO2 and biotic invasions) on alpine ecosystems. The session brings together workers on long-term projects from many parts of the world (North and South America, Asia and Europe). Long-term experimental manipulation and observation-based studies focusing on ecosystem structure and function will be presented first, followed by ecosystem level integration of trace gas flux observations; modelling studies will lead up to a panel discussion and synthesis (one or two talk-slot length). The session will begin with presentations of two long-term experimental warming experiments in alpine tundra: the first will introduce an IR warming experiment on Niwot Ridge, and the second report on work carried out on experimental warming and grazing by using open-top chambers on the Tibetan Plateau. Then the role of land use in the shaping of structure and functioning of Himalayan Kobresia sedge heaths will be discussed, followed by a talk on long-term impacts of grazing management on alpine pastures in the Pyrenees. An overview of the impacts of N deposition on the Niwot Ridge tundra structure and functioning will be followed by a talk about the Swiss alpine free-air CO2 enrichment experiment. An overview of observed alien species in alpine ecosystems worldwide will close the first part. In the scond part, speakers will discuss the ecosystem level integration of CO2 and H2O exchanges observed on Niwot Ridge, and below-ground organisms and processes along and their importance in the light of global change drivers. Finally, a talk about modelling approaches applied to alpine ecosystems will close the organised part of the session. Two additional slots are left free for the conference organisers to add additional talks, or allow a moderated panel discussion and synthesis.
Organizer:Laszlo Nagy, EcoScience Scotland
Moderator:Laszlo Nagy, EcoScience Scotland
1:30 PMOOS 16-1Treeline dynamics and its relation to climate variability in the Qingba Mts, central China
Quanfa Zhang, Wuhan Botanical Garden, the Chinese Academy of Sciences
1:50 PMOOS 16-2Alpine Treeline Warming Experiment: Testing alpine and subalpine species and population responses to climate change
Lara M. Kueppers, University of California, Merced
2:10 PMOOS 16-3A multi-method investigation of global change on the Tibetan Plateau: Ecosystem effects of warming, precipitation and grazing across meadow, shrubland and steppe communities
Julia A. Klein, Colorado State University, Joseph Bump, Michigan Technological University, John Harte, University of California, Berkeley, Kelly A. Hopping, Colorado State University, Jia Hu, Colorado State University, Shichang Kang, Chinese Academy of Sciences, Xinquan Zhao, Northwest Institute of Plateau Biology, Chinese Academy of Sciences
2:30 PMOOS 16-4The quest for naturalness in alpine biomes: Kobresia pastures in Tibet
Georg Miehe, Philips Universitaat Marburg
2:50 PMOOS 16-5Impacts of nitrogen deposition on alpine ecosystem structure and function
William D. Bowman, University of Colorado
3:10 PM Break
3:20 PMOOS 16-6Alpine vegetation under atmospheric change
Christian Körner, University of Basel, Erika Hiltbrunner, University of Basel, Nicole Inauen, University of Basel, Daniel Scherrer, University of Basel
3:40 PMOOS 16-7Plant invasions in alpine habitats: insights into altitudinal patterns and mechanisms from the dandelion invasion in the Chilean Andes
Lohengrin A. Cavieres, Universidad de Concepción, Instituto de Ecología y Biodiversidad (IEB), Aníbal Pauchard, Universidad de Concepción, Instituto de Ecología y Biodiversidad (IEB)
4:00 PMOOS 16-8Ecosystem level integration of CO2 and H2O exchanges observed on Niwot Ridge
Peter D. Blanken, University of Colorado, Boulder, Mark Williams, University of Colorado, John F. Knowles, University of Colorado, Kurt M. Chowanski, University of Colorado Boulder
4:20 PMOOS 16-9Plant-soil interactions and carbon dynamics in mountain ecosystems
Richard D. Bardgett, Lancaster University, Sue E. Ward, Lancaster University, Gerlinde B. De Deyn, Netherlands Institute of Ecology, Nick J. Ostle, Centre for Ecology and Hydrology
4:40 PMOOS 16-10Global change impact on mountain plant diversity: Modelling insights from the Swiss Alps
Antoine Guisan, Université de Lausanne, J. Pottier, Université de Lausanne, L. Pellissier, Université de Lausanne, A. Dubuis, Université de Lausanne, Christophe F. Randin, Université de Lausanne, Robin Engler, Université de Lausanne, M. Anzini, Université de Lausanne, L. Maiorano, Université de Lausanne, Pascal Vittoz, Université de Lausanne

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