Skip to main content

X-ray computed tomography to incorporate redox conditions into soil carbon turnover models


EMSL Project ID
48704

Abstract

We propose to parameterize the tendency of a given soil structure (structure = the combination of diffusive domains and the surrounding spatial void pattern within a given soil volume, Figure 1) to promote the development of biogeochemically distinct subregions harboring independent microbial metabolic redox regimes. Both variables (domain size and pattern of voids) are considered as quantifiable through XCT. We intend to take advantage of the ability of EMSL's Nikon (Metris) XTH 320/225 kV XCT System to interrogate soil volumes of a physical size (24 x 18 cm) that can be considered relevant for upscaling to the pedon and ultimately, landscape scale. These "mesoscale" investigations are conducted in conjunction with micron-scale investigations of microbial metabolic response that are currently underway as part of a joint DOE-TES project "Spatial variation in microbial processes controlling mineralization within soils and sediments" (PI: Scott Fendorf).

Project Details

Project type
Limited Scope
Start Date
2014-12-01
End Date
2015-01-31
Status
Closed

Team

Principal Investigator

Markus Kleber
Institution
Oregon State University

Team Members

Thomas Wanzek
Institution
Oregon State University

Peter Nico
Institution
Lawrence Berkeley National Laboratory

Marco Keiluweit
Institution
University of Massachusetts Amherst

Scott Fendorf
Institution
Stanford University

Related Publications

Wanzek T., M. Keiluweit, T. Varga, A. Lindsley, P.S. Nico, S. Fendorf, and M. Kleber. 2018. "The Ability of Soil Pore Network Metrics to Predict Redox Dynamics Is Scale Dependent." Soil Systems 2, no. 66:1-25. PNNL-SA-141472. doi:10.3390/soilsystems2040066