[Enviro-lunch] Reminder: Enviro-lunch (2/28, M): Dr. Kate Heckman from USDA

Mon Feb 28 10:21:15 PST 2022

Hello all,

Please join us today (2/28) for our Enviro-linch seminar series. Today, our guest speaker is Dr. Kate Heckman from USDA who will present her research about carbon cycling in forests and grasslands. Please join us between 12-1 pm (PST) via zoom.

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

Title: Climate and physicochemical controls on C cycling in forests and grasslands of the conterminous USA

See you all soon.

Regards,

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, February 22, 2022 10:51 AM
To: enviro-lunch at lists.ucmerced.edu <enviro-lunch at lists.ucmerced.edu>
Subject: [Enviro-lunch] Enviro-lunch (2/28, M): Dr. Kate Heckman from USDA

[image.png]

Hello all,

Next Monday (2/28) Dr. Kate Heckman from USDA will present her research about carbon cycling in forests and grasslands. Please join us between 12-1 pm (pacific) via zoom.

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

Title: Climate and physicochemical controls on C cycling in forests and grasslands of the conterminous USA

Abstract: Mechanisms of soil organic matter (SOM) stabilization regulate turnover of SOM by making biodegradation energetically or physically unfavorable. Though similar mechanisms of SOM stabilization are at work across a wide diversity of soils, which soil conditions determine their relative importance is just beginning to be elucidated. We utilized soil cores from 35 National Ecological Observatory Network (NEON) experimental plots, covering a wide diversity of ecosystem and soil types, to examine the influence of physicochemical parameters on soil C abundance and turnover, and their relative importance in comparison to climatic variables. Soils from three depths at each site were density fractionated into free/light, occluded and heavy fractions. Carbon and radiocarbon abundance were examined among fractions and in the context of climatic variables (e.g. temperature, precipitation, moisture balance) and soil physiochemical variables (e.g. texture, pH, exchangeable cations, reactive metals). The abundance and persistence (i.e. stability or mean residence time) of C differed among fractions and with depth, as expected. Organic matter abundance in surface horizons was more closely associated with climate variability than that of subsurface horizons. Perhaps the most interesting result of this study is the strong bifurcation in soil organic matter cycling characteristics in arid versus humid environments.

Bio:

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•       BA in Biology & Environmental Science in 2004 from Drury University in Springfield, Missouri.

•       PhD in Soil, Water & Environmental Science in 2010 from University of Arizona in Tucson, Arizona.

•       2011-2015: Postdoc focused on the application of radiocarbon to earth system sciences with an emphasis on temperate mineral soils. Employed by the USDA Forest Service and stationed remotely as a Visiting Scientist at Lawrence Livermore National Laboratory.

•       2015-current: Research Scientist for the USDA Forest Service, Northern Research Station, in Houghton, Michigan. Directs a radiocarbon research program for the Forest Service, mostly focused on assisting and leading research associated with the application of radiocarbon analysis to C cycle and climate change questions. Personal research assignment focused on the biogeochemistry of mineral soils, specifically regarding mechanisms of soil organic carbon stabilization.

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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