[Enviro-lunch] Today 11/29: Marjorie Schulz

[Jing Yan]

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Hello Everyone,
Please join us for a talk Today. Nov. 29 by Marjorie Schulz, 12-1pm in Room SE2-302.


Talk Title:
Looking deep to understand SOM-mineral relationships: Rhizospheres and Biofilms

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Abstract:
Soil organic matter (SOM) in deep (>30 cm) soil is microbially processed. Integration of microbial carbon into a long-term carbon pool is not well understood but known to be related to associations with short range ordered (SRO) minerals and/or soil aggregates. However, there remains a significant knowledge gap; we do not yet understand the processes occurring at the microbe-mineral interface. Soil microbial processes have been studied mostly through bulk measurements such as soil respiration and enzymatic assays. Where the microbes inhabit and interact with soil minerals is not well established. Scanning electron microscopy (SEM) images demonstrate that SOM mineral interfaces are commonly microbial biofilms and their remnants illustrating the importance of biofilm production in generating SOM. These images also show that fungi and biofilms weather primary mineral grains, that soil organo-cutans are biofilms, and that biologic precipitation of SRO minerals occurs in biofilms, likely co-precipitating with organic compounds. This work shows how SEM can be used without extensive sample preparation to image SOM.

Bio:
Jorie has a BA in geology from Knox College and an MS in geology from University of Missouri. She has worked at the USGS since 1987, first in the branch of Marine Geology with a project studying Fe-Mn crusts. She transferred to National Research Program of the Water Division in 1990 to work with Art White on mineral dissolution rates. This project used soil chronosequences to studying long term dissolution rates of primary minerals. The work in soil chronosequences has continued to the present giving Jorie an appreciation of the effect of time. She is currently a lead scientist on a project titled, Biogeochemistry of soils: carbon/water/rock interaction in the critical zone.

When: Nov. 29, Thursday, 12pm - 1pm

Where: SE2-302

Coffee will be provided, please bring your own mugs.

We look forward to seeing you,

Nate & Jing

Organizers for Fall 2018: Nate Bogie and Jing Yan
Faculty coordinator: Asmeret Asefaw Berhe



Jing Yan
ES-LES-QSB Postdoctoral Fellow, Soil & Environmental Physics Lab
Life and Environmental Sciences
School of Natural Sciences
University of California, Merced

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