OOS 34 - Evaluating Lags and Legacies of Drought Recovery

Thursday, August 10, 2017: 8:00 AM-11:30 AM
Portland Blrm 256, Oregon Convention Center
Jessica S. Guo, Northern Arizona University
Drew M. P. Peltier, Northern Arizona University
Jessica S Guo, Northern Arizona University
Droughts can result in cascading, complex, and difficult-to-study impacts on individual plant physiology and ecosystem function. As drought-related perturbations of ecosystems become more frequent, our understanding of plant responses to drought stress will become increasingly valuable. A large body of work evaluates the carbon and hydraulic consequences of drought at multiple hierarchical and temporal scales. An emerging theme of this research is that plant responses to drought may be complex, lagging the drought signal on the order of hours to years. Hysteretic drought responses can also lead to delayed recovery after alleviation of drought conditions. Recent studies of both experimental and natural droughts have yielded insight into these types of temporal patterns of response and recovery in plant carbon and hydraulic status. Nonetheless, there remains mechanistic uncertainty in lags and legacies along the spectrum of drought responses, up to and including drought mortality. Non-structural carbohydrates and their role in mitigating or exacerbating responses to drought conditions are a key area of research. Lagged drought effects may also be a function of embolism refilling or other transport limitations that have been recently elucidated. This session seeks to bring together the latest research on mechanisms underlying the responses of plants to drought across time scales as well as the consequences of plant physiology for ecosystem-level responses to changing climate.
8:00 AM
 What drives drought recovery? A global perspective
Christopher Schwalm, Northern Arizona University; William R. L. Anderegg, University of Utah; Anna M. Michalak, Carnegie Institution for Science; Joshua B. Fisher, California Institute of Technology; Franco Biondi, University of Nevada; George W. Koch, Northern Arizona University; Marcy E. Litvak, University of New Mexico; Kiona Ogle, Northern Arizona University; John D. Shaw, USDA Forest Service; Adam Wolf, Princeton University; Deborah Huntzinger, Northern Arizona University; Kevin Schaefer, National Snow & Ice Data Center; Yaxing Wei, Oak Ridge National Laboratory; Yuanyuan Fang, Carnegie Institution for Science; Daniel J. Hayes, University of Maine; Maoyi Huang, , Pacific Northwest National Laboratory; Atul Jain, University of Illinois; Hanqin Tian, Auburn University
8:20 AM
 Drought legacies increase ecosystem sensitivity to future drought
Melinda D. Smith, Colorado State University; Alan K. Knapp, Colorado State University; David L. Hoover, USDA-ARS; Meghan L. Avolio, National Socio-Environmental Synthesis Center; Andrew Felton, Colorado State University; Kevin R. Wilcox, University of Oklahoma
8:40 AM
 Drought impact on forest carbon dynamics, allocation and fluxes across tropical forests
Christopher Doughty, Northern Arizona University; Yadvinder Malhi, University of Oxford; Sam Moore, Oxford; Terhi Riutta, University of Oxford
9:00 AM
 Reconstructing drought legacies in the North American monsoon climate system using tree ring stable isotopes
Russell K. Monson, University of Arizona; Paul Szejner, University of Arizona; Soumaya Belmecheri, University of Arizona; Kiyomi Morino, University of Arizona; William (Ed) Wright, University of Arizona; Flurin Babst, University of Arizona; Malcolm Hughes, University of Arizona; Steven Leavitt, University of Arizona; Valerie Trouet, University of Arizona; James Ehleringer, University of Utah
9:20 AM
  Ecological memories in daily net ecosystem exchange of carbon (NEE) across the globe
Yao Liu, Northern Arizona University; Christopher Schwalm, Woods Hole Research Center; Kimberly E. Samuels-Crow, Northern Arizona University; Kiona Ogle, Northern Arizona University
9:40 AM
9:50 AM
 Acclimation to long-term drying and warming and consequences for tree water dynamics
Charlotte Grossiord, Los Alamos National Laboratory; Sanna Sevanto, Los Alamos National Laboratory; Henry D. Adams, Oklahoma State University; Adam D. Collins, Los Alamos National Laboratory; Todd E. Dawson, University of California Berkeley; Lee T. Dickman, Los Alamos National Laboratory; Patrick J. Hudson, University of New Mexico- Albuquerque; William T. Pockman, University of New Mexico; Alberto Vilagrosa, CEAM Foundation; Nate G. McDowell, Los Alamos National Laboratory
10:10 AM
 Limitations on gas exchange recovery following natural drought in evergreen woodlands
Robert Skelton, University of California Berkeley; Timothy J Brodribb, University of Tasmania; Scott AM McAdam, University of Tasmania; Patrick Mitchell, CSIRO; David D. Ackerly, University of California Berkeley; Todd E. Dawson, University of California Berkeley; Sally Thompson, University of California Berkeley
10:30 AM
 The multiple roles of wood rays during water limitation
Sebastian Pfautsch, University of Sydney; Maurizio Mencuccini, Autonomous University of Barcelona
10:50 AM
 How the chemistry of xylem apoplast influences recovery from water stress
Francesca Secchi, University of Turin; Chiara Pagliarani, Universita' di Torino; Valentino Casolo, Universita' di Udine; Maciej A. Zwieniecki, UC Davis
11:10 AM
 Water for carbon and carbon for water: The intimate link between carbohydrates and water in plants
Anna Sala, University of Montana; Aurora Lela Bayless, University of Montana; Beth Roskilly, University of Montana; Gerard Sapes, University of Montana