[Enviro-lunch] Today (09/26): Dinesh Adhikari from LLNL

[Yang Yang]

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Hello Everyone, please join us Today for this week's Enviro-Lunch talk by Dinesh Adhikari from LLNL, at 11 am to noon in room SE2-224.

Coupled biogeochemical cycles of iron and organic carbon:
Investigation on organic carbon and iron-mineral synthesized complexes
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Soil organic carbon (SOC) is one of the largest carbon (C) reservoir on the earth surface, containing about twice the amount of C in the atmosphere. Understanding SOC residence time is crucial for accurately modeling global C dynamics. Widely occurring iron (Fe) oxide minerals can strongly bind with SOC and play in important role in C stability. Under aerobic condition, Fe-SOC association can potentially provide physicochemical protection to SOC and inhibit its degradation. However, transient or permanent anaerobic condition in soils promotes Fe redox reactions, which may compromise the stability of Fe-bound SOC. Therefore, understanding the fate of Fe-bound SOC during anaerobic/aerobic incubation and redox reactions of Fe is important for predicting SOC residence time in soil.

We investigated the fate and transformation of mineral-associated SOC during Fe reduction (anaerobic) and during aerobic incubation. Our results highlight that the C/Fe ratio and mineral type played an important role with broad implications on the stability of SOC. Findings from our study will be valuable in the development of the process-based model for C cycles and prediction of its response to climate change.


Bio: I am a Postdoctoral Researcher at Lawrence Livermore National Laboratory working under Jennifer Pett-Ridge. At LLNL, my work focuses on understanding how microbe-mineral interactions regulate cellular-C persistence in soil. I am currently working on an experiment using microbial isolates with defined traits in combination with defined minerals, to determine the impact of microbial traits and mineralogy on the composition and stability of mineral-associated OC. My graduate research was mainly focused on understanding the fate of Fe-mineral associated SOC during anaerobic Fe reduction and aerobic incubation. My email is Adhikari2 at llnl.gov<mailto:Adhikari2 at llnl.gov> if you want to reach me.

When: Thursday 09/26, 11am - noon



Where: SE2-224



We look forward to seeing you,



Yang, Jennifer and Jing



Organizers for Fall 2019: Yang Yang and Jennifer Alvarez

Faculty coordinator: Asmeret Asefaw Berhe

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