[Enviro-lunch] Reminder : Enviro-Lunch Today (4/4) with Dr. Hannah Naughton from Lawrence Berkeley National Lab on soil redox processes

Mon Apr 4 10:22:59 PDT 2022

Hello all,
Please join us today  (4/4) for our Enviro-lunch seminar series between 12-1 pm (pacific) via zoom. Today our guest speaker is Dr. Hannah Naughton from Lawrence Berkeley National Laboratory who will be presenting her research on redox processes in soils.

https://ucmerced.zoom.us/j/175736103

Title: Determining landscape drivers of redox anomalies in upland and floodplain soils

See you all soon!

Manisha and KJ
________________________________
From: Enviro-lunch <enviro-lunch-bounces at lists.ucmerced.edu> on behalf of Kyungjin Min <kjmin.21 at gmail.com>
Sent: Tuesday, March 29, 2022 11:16 AM
To: enviro-lunch at lists.ucmerced.edu <enviro-lunch at lists.ucmerced.edu>
Subject: [Enviro-lunch] Enviro-Lunch (4/4): Dr. Hannah Naughton from Lawrence Berkeley National Lab on soil redox processes

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Hello all,

Next Monday (4/4) Dr. Hannah Naughton from Lawrence Berkeley National Laboratory will present redox processes in soils. Please join us between 12-1 pm (pacific) via zoom.

https://ucmerced.zoom.us/j/175736103

Title: Determining landscape drivers of redox anomalies in upland and floodplain soils

Abstract: Soils vary vastly in architecture and chemical composition at the landscape scale (km) and microscale (cm), resulting in variable responses to hydrologic events.  Within aerobic upland soils, high organic matter and limited oxygen diffusion result in local anoxia ranging in spatial scale from microns to centimeters.  These redox anomalies can heavily skew predictions of carbon and greenhouse gas cycling made based on bulk soil information.  I will explain how soil structure-imposed redox gradients control soil carbon quality and potential for preservation in upland soils using laboratory soil reactors and then highlight similar findings in a series of hydrologically unique sites along a subalpine floodplain.  Because soil structure occurs over small scales relative to those at which ecosystem processes like carbon and nitrogen fluxes are modeled, I will explain how these and other biogeochemical patterns resulting from structured soil may be underrepresented in landscape models.  Finally, I will introduce an experimental design testing whether remotely sensible landscape features can proxy for soil structure and thus help predict soil redox heterogeneity and function.  Here I discuss my ongoing research at a hillslope meadow in the East River valley in Colorado testing for the presence of anaerobic microsites associated with plant roots and topographic position – two factors known to affect soil architecture and wetness, which both control soil redox heterogeneity.  This work seeks to illuminate new drivers of redox anomaly hot spots in soils with the ultimate goal of tying remotely sensible features of plant community and topography to soil redox heterogeneities for improving carbon stock and cycling predictions.

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Bio: Hannah is an NSF Postdoctoral Research Fellow working in the Climate and Ecosystem Sciences Division at Lawrence Berkeley National Laboratory under Dr. Eoin Brodie.  Her expertise is in soil biogeochemistry with a focus on microbial carbon processing.  She studies how the physical heterogeneity of soil environments affects local chemistry and ability of microorganisms to decompose and respire organic carbon, thus linking the terrestrial and atmospheric carbon cycles.  Hannah’s ultimate goal is to improve predictions of microbial carbon processing from spatially and temporally short timescales using field and laboratory work to landscape scales using machine learning and remote sensing.

Hannah received a Ph.D. in Earth System Science from Stanford University in 2020 after completing an M.S. degree in Conservation Ecology from the University of Michigan, Ann Arbor, in 2014 with a focus on biodiversity and ecosystem function.  Her alma mater is the College of William & Mary, where she received a B.S. in Chemistry and Biology in 2012.  She has assistant-taught inorganic, physical and organic chemistry in addition to soil science courses and has mentored teachers, high school and undergraduate students in both research and professional development contexts.  Outside of lab, she enjoys playing the piano, climbing and walking through nature.

Sincerely,

co-host: KJ Min & Manisha Dolui

Faculty coordinator: Asmeret Asefaw Berhe

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Spring 2022 Enviro-Lunch Schedule

date

speaker

title

1/31

Mariela Garcia Arrendondo
@ Umass-Amherst

Root-mediated weathering

2/7

Michael Philben
@ Hope College

Rethinking carbon and nitrogen isotope fractionation during soil organic matter decomposition

2/14

Alyssa Griffin*
@ UC Davis

The role of coastal marine sediments in carbon cycling from local to global scales

2/21

Presidents’ day

2/28

Katherine Heckman
@ USDA

Density fractionation and soil carbon stabilization

3/7

Bhavna Arora
@ LBNL

Reactive transport modeling

3/14

Darian Smercina
@ PNNL

Free N fixing under switchgrass (Linking microbial scale processes to ecosystem function)

3/21

spring break

3/28

Meng Zhao
@ Stanford U

Plant-water relationship (evapotranspiration) modeling

4/4

Hannah Naughton
@ LBNL

Root vs. topographic generation of redox anomalies on a subalpine hillslope and floodplain

4/11

Michael Rowley
@ LBNL

Ca-mediated soil organic carbon stabilization

4/18

Weiyu Li*
@ Stanford U

Data-driven hydraulic modeling

4/25

Daniel Zuleta

@ Smithsonian Institute

Tree mortality in tropical ecosystems

5/2

Genevieve Noyce
@ Smithsonian Institute

Greenhouse gas emissions from wetland with climate change

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