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
Released Data Link
Team
Principal Investigator
Team Members
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