457-11
Poster Number 2036
See more from this Division: SSSA Division: Wetland SoilsSee more from this Session: Wetland Soils: II (includes student competition)
Solute flow patterns, which are based on pore structure, have been used to constrain soil structure by modeling the distribution of microbial communities and SOM mineralization rates. However, little scalable information is available about the relation between soil structure and the ability of the total soil environment to supply electron acceptors for carbon mineralization (oxidation).
Here we investigate the possibility to use indirect information about in situ metabolic activity to define the pore network and the resulting structural organization of the soil. To this end, we installed replicate platinum redox probes (n = 6 per depth increment) in a Willamette Valley soil with an epiaquic moisture regime and monitored redox potentials over time. The existence of scalable relationships between pore network characteristics (assessed using 3D computed tomography) and the distribution of metabolically distinct subunits (identified through their redox status) were investigated and will be discussed.
See more from this Session: Wetland Soils: II (includes student competition)