[Enviro-lunch] TODAY 12pm: Kristin Steger

[Nate Bogie]

[image: cid:image003.png at 01D39939.E12AA3D0]



Hello Everyone,

Please join us for a talk *today* by Dr. Kristin Steger, 12-1pm in Room
SE2-302.





*Kristin Steger*

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



[image: pic_download]



*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
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