[Enviro-lunch] Enviro-Lunch THURSDAY 12pm: Kristin Steger

[Jing Yan]

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Hello Everyone,
Please join us for a talk on Thursday by Dr. Kristin Steger, 12-1pm in Room SE2-302.


Kristin Steger
 Visiting Scientist, Department of Viticulture and Enology, University of California, Davis

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The Cosumnes River floodplain: soil carbon dynamics, bacterial diversity and restoration benefits


Abstract:
Active floodplains can store large amounts of organic carbon (SOC) in subsoils, and our study focussed on the assessment of SOC pools associated with alluvial floodplain soils that were affected by human-induced changes and in situ SOC mineralisation due to land use change. Our test site at the Cosumnes River provides a unique opportunity to distinguish natural and human-induced effects, because the periods of increased sedimentation and land use change are well documented, and both started in the 1850s.
Using different methodological approaches (analysis of stable carbon isotopic ratios, radiocarbon dating and total mercury analysis), our results underline the importance of within catchment sediment dynamics that need to be taken into account in regional to global SOC budgets. Historic data give evidence that large amounts of sediment were transported into the floodplains of most rivers of the Central Valley and deposited over organically rich topsoil, which promoted the stabilization of SOC.
In addition to soil carbon dynamics, I am going to present preliminary results about bacterial community structure and the strong effect of soil depth on the diversity. Moreover, we examined several metrics of restoration benefits to investigate the variation with restoration age and restoration method. Our results suggest that a combination of planting and enhanced floodplain connectivity will be most successful in restoring riparian benefits.

Bio:
Kristin Steger
BSc and MSc, Biotechnology, Technical University Berlin (Germany), 1998
PhD, Environmental Microbiology, Swedish University of Agricultural Sciences, Uppsala, 2006
Postdoctoral researcher, Limnology, Uppsala University (Sweden), 2006-2010
Guest Professor, Indo-German Centre for Sustainability, Indian Institute of Technology Madras, Chennai, 2011-2012
Visiting Scientist, Institute for Modelling Hydraulic and Environmental Systems, Stuttgart University (Germany), 2013-2014
Visiting Scientist, Department of Viticulture and Enology, University of California, Davis, 2015-present


When: Feb. 1st, 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 Spring 2018: Nate Bogie and Jing Yan
Faculty coordinator: Asmeret Asefaw Berhe


Jing Yan
Postdoctoral Scholar, Soil Physics Lab, School of Natural Sciences,
University of California, Merced

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