The University of Arizona

College of Agriculture and Life Sciences

SNRE Seminar Speaker Series with Dr. Laura Meredith

Wednesday, September 15, 2021

The next SNRE seminar is Wednesday, Sepptember 15!
Speaker: Dr. Laura Meredith, UA SNRE
Title: Soil-microbe-plant feedbacks to ecosystem drought in an experimental tropical rainforest
Date:  Wednesday, September 15, 2021
Time:  3:00-4:00 pm 
Location:  ENR2, S107 or Zoom :
Forest droughts are projected to increase in frequency and duration with climate change, with significant potential impacts to ecosystem function and global carbon budgets. Biological responses and feedbacks to drought involving plants, microbes, and their interactions, will strongly influence the resilience of forests and impact on the global system. In the 2019-2020 Biosphere 2 Water, Atmosphere, and Life Dynamics (B2 WALD) experiment, we use the world’s largest controlled growth facility—the Biosphere 2 Tropical Rainforest (TRF)—to experimentally evaluate the response of carbon and water cycling in tropical ecosystems to severe drought. We imposed controlled drought and rewet conditions and meanwhile tracked the response of multiple ecosystem compartments (i.e., soil, root, stem, leaf, atmosphere) using online gas fluxes and sensors, offline multi-omics approaches, and stable isotope tracing methods including atmospheric 13CO2 pulse labeling, deep water D-H2O labeling, and position-specific labeling of volatile organic compounds (VOCs) 13C precursors. In this presentation, I will share our emerging results on the sensitivity of plant and microbial function to drought and how biological interactions contribute to forest resiliency. 

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