OOS 37 - Droughts and Downpours: The Effect of Experimentally Altered Precipitation Patterns on Plant Function and Community Structure

Thursday, August 11, 2011: 8:00 AM-11:30 AM
14, Austin Convention Center
Organizer: Vikki Rodgers
Co-organizer: Susanne S. Hoeppner
Moderator: Vikki Rodgers
The impact of current climate variability and projected future climate change on plant function, community structure, and ecosystem functioning is a topic of global concern and wide public interest. The amount and timing of precipitation is one of the critical climate factors that affects plant growth and governs the distribution and functioning of ecosystems on a global scale. Therefore, it is important to gain a collective understanding of the impacts that changes in water availability have on different vegetation types across various scales of interest. In recent years, technological advances and a greater availability of field monitoring equipment have enabled researchers to conduct larger numbers of complex, manipulative climate change experiments in the field. This session will bring together researchers from a wide variety of rainfall manipulation and climate change experiments across different regions and habitats to discuss and compare their findings on how plants will respond to altered water availability. By considering experiments that vary precipitation amounts as well as those that vary its temporal distribution, we will investigate how responses to warming interact with precipitation dynamics to affect critical ecological responses, from the scale of individual plants, to community composition, to nutrient cycling and ecosystem functioning. In this session, we will present salient findings from 7 different rainfall manipulation experiments (the Boston Area Climate Experiment; the Penn State Climate Change Experiment; the EVENT Experiment; the Konza Prairie LTER; the Kruger National Park rainfall manipulation in South Africa; the Prairie Heating and CO2 Enrichment Experiment; the Tolfa Allumiere rain manipulation experiment; and the Sevilleta LTER.) The talks in this organized session will be arranged from genotype level responses to ecosystem level responses to highlight the differences of scales at work in plant-water relations. In synthesizing these results, we hope to achieve a geographically broad overview of the effects of water availability on plant communities that transcends individual ecosystems/sites and can be used to discern general trends and highlight the implications of these findings to earth stewardship concerns.
8:00 AM
Genotypes of a dominant tallgrass species vary in their response to changes in precipitation means and variability
Meghan L. Avolio, University of Utah; Melinda D. Smith, Colorado State University
8:40 AM
Mortality, leaf drop, and growth: Tree seedling drought stress and warming responses in the Boston Area Climate Experiment
Susanne S. Hoeppner, Purdue University; Grace Pold, University of Massachusetts, Amherst; Jeffrey S. Dukes, Purdue University
9:00 AM
Growth and physiological responses of deciduous tree seedlings to three years of increased temperature and precipitation treatments
Rebekah Wagner, Pennsylvania State University; Margot W. Kaye, Pennsylvania State University; Jason Kaye, Pennsylvania State University; Marc Abrams, The Pennsylvania State University
9:20 AM
Sensitivity of plant functions (i.e. growth, photosynthesis, phenology) and community composition in temperate grassland to severe drought
Anke Jentsch, University of Bayreuth; Julia Walter, University of Bayreuth; Kerstin Grant, University of Bayreuth; Laura Nagy, University of Bayreuth; Juergen Kreyling, University of Bayreuth; Carl Beierkuhnlein, University of Bayreuth
9:40 AM
9:50 AM
Interactive effects of drought grazing and fire on grasslands community dynamics: a cross-continental comparison
Sally E. Koerner, Duke University; Scott L. Collins, University of New Mexico
10:10 AM
Precipitation dynamics in a mixed grass prarie: Manipulations and interactions with warming and CO2
Jana L. Heisler-White, TriHydro, Inc; Jack A. Morgan, USDA-ARS; Elise G. Pendall, University of Wyoming; Dana Blumenthal, Rangeland Resources Research Unit; David G. Williams, University of Wyoming
10:30 AM
Linking water and carbon in Mediterranean ecosystems: The MIND project and beyond
Franco Miglietta, CNR-IBIMET; Giorgio Alberti, University of Udine; M. Francesca Cotrufo, Colorado State University; Ilaria Inglima, Second University of Naples; Hrvoje Marjanović, Forest Research Institute Jastrebarsko; Daniel R. LeCain, USDA-ARS; Alessandro Zaldei, CNR-IBIMET; Alessandro Peressotti, University of Udine
10:50 AM
Differential responses of pinon and juniper in a rainfall manipulation experiment in central New Mexico, USA
William T. Pockman, University of New Mexico; Jennifer Plaut, University of New Mexico; Robert E. Pangle, University of New Mexico; Jean-Marc Limousin, University of New Mexico; Patrick J. Hudson, University of New Mexico- Albuquerque; Enrico A. Yepez, University of New Mexico; Nathan Gehres, University of New Mexico; Amanda L. Boutz, University of New Mexico; Scott L. Collins, University of New Mexico; Nate McDowell, Pacific Northwest National Laboratory
11:10 AM
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