Cornell University

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Linking microbial carbon use efficiency and the formation of mineral-organic associations: An integrations of substrate chemistry, microbial physiology, and mineral saturation deficit

Thursday, November 16, 2017 at 12:20pm to 1:10pm

Emerson Hall, 135

Recent experimental work has elevated the importance of microbial processing for the stabilization of fresh carbon inputs within the soil mineral matrix. Enhancing our understanding of soil carbon and nitrogen dynamics therefore requires a better understanding of how efficiently microbial metabolism can process low molecular weight carbon substrates (carbon use efficiency, CUE) under environmentally relevant conditions. One approach is the ecophysiological study of soil isolates in liquid media culture consisting of soil-extracted solubilized organic matter (SESOM). We are using SESOM from an Oa horizon under hemlock hardwood vegetation in upstate New York as liquid media for the growth of 12 isolates from the Oa and B horizon of the same site. Here we seek to test the uptake rates as well as CUE of 5 different low molecular weight substrates spanning compound class and nominal oxidation state by isolates differing in phylogeny and physiology. Building off of these results, we hope to test how different initial organic loadings of an illitic clay fraction from the same site impact stabilization rates of added substrate C and N.  

Event Type



Crop and Soil Sciences (CSS), Sustainability


CSS, CSS sips, SCS

Contact E-Mail

Contact Name

Janice Thies

Contact Phone



Taylor Cyle

Speaker Affiliation

PhD Student, Soil and Crop Sciences, Cornell University

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