[Esip-envirosensing] Oct. 4th Envirosensing Cluster Call: Speaker Info!

Gearon, James H. jhgearon at iu.edu
Fri Sep 30 11:00:33 EDT 2022

Dear Envirosensors!

This is a friendly reminder of the monthly cluster call this coming Tuesday, 4 October, at 5:00 pm EDT (2:00 pm PDT).

We will welcome Sander Denham, a Ph.D candidate from the O’Neill School of Public and Environmental Affairs at Indiana University, Bloomington who will give a presentation:

Using sapflux sensors to explore water-use strategies of deciduous tree species during periods of hydrologic stress.

Sander O. Denham

Indiana University, Bloomington

Bio: Sander Denham is a Ph. D candidate in the O’Neill School of Public and Environmental Affairs at Indiana University—Bloomington working in the Novick Lab. She received a B. Sc in Geography and Planning from Appalachian State University and a dual M. Sc. in Forest Science with a focus on Forest Ecology and Management from North Carolina State University and University of Helsinki. Her research explores vegetation-climate feedbacks with particular interest in how different species in eastern deciduous forests of the US respond to various environmental stress (e.g., drought). She received a predoctoral fellowship from the National Institute of Food and Agriculture using a novel approach leveraging near-surface digital imagery and eddy-covariance flux tower data to investigate the effects of species variability in phenological timing on water and carbon cycling.

Abstract: Hydraulic stress in plants occurs under conditions of low water availability (soil moisture; θ) and/or high atmospheric-demand for water (vapor pressure deficit; D). Different species are adapted to respond to hydraulic stress by functioning along a continuum where at one end they close stomata to maintain a constant leaf water potential (ΨL) (isohydric species), and at the other they allow ΨL to decline (anisohydric species). Differences in water use along this continuum are most notable during hydrologic stress, often characterized by low θ and high D; however, θ and D are often, but not necessarily coupled at timescales of weeks or longer, and uncertainty remains about the sensitivity of different water use strategies to these variables. Quantifying the effects of both θ and D on canopy conductance (Gc) can be accomplished by estimating tree-level Gc using hourly sap flow observations. We performed this analysis for widely distributed canopy-dominant species along the iso-anisohydric spectrum growing along a hydroclimatological gradient from three sites in the eastern United States: a mesic forest in western North Carolina, and two xeric forests in southern Indiana and Missouri. Each site experienced at least one year of substantial drought conditions. Our results suggest that sensitivity of Gc to θ varies across sites and species, with Gc sensitivity being greater in dry than in wet sites, and greater for isohydric compared to anisohydric species. However, once θ limitations are accounted for, sensitivity of Gc to D remains relatively constant across sites and species. While D limitations to Gc were similar across sites and species, ranging from 16-34% reductions, θ limitations to Gc ranged from 0-40%.

Open to all who are interested: ZOOM LINK HERE!<https://esipfed-org.zoom.us/j/85237873060?pwd=YXJpSldadkdGR3hGL1EwR3NQcTVFUT09>

Topic: Envirosensing
Time: Oct 4, 2022 05:00 PM Eastern Time (US and Canada)
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Your Envirosensing Cluster Committee,

Jake, Scotty, Martha, and Joseph
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