Assistant Professor of Soils and the Environment
Prospective students: Graduate assistantships available, please contact Marco directly (firstname.lastname@example.org)
Postdoctoral Fellow Soil Biogeochemistry, Stanford University, 2013-2014.
Doctor of Philosophy Soil Science, Oregon State University, 2010-2013.
Lawrence Scholar Student Chemical Sciences Division, Lawrence Livermore National Laboratory, 2010-2013.
Master of Science Soil Chemistry, Oregon State University, 2008-2010.
Bachelor of Science Geoecology, University of Tübingen, 2004-2008.
Dr. Keiluweit’s research broadly focuses on the response of soil processes to climate change. The main goal of his research is to understand the effect of changing environmental conditions on fundamental ecological mechanisms that control the fate of essential elements, most importantly the cycling and storage of carbon.
Dr. Keiluweit’s research group investigates abiotic and biotic mechanisms that couple the biogeochemical cycling of C to that of other ecologically relevant elements such as Al, Fe, Mn, N, and P. In order to examine the relevance of these mechanisms across multiple scales, he combines laboratory model systems with in-field measurements. He specializes in using fine-scale in-situ microsensor techniques as well as novel, synchrotron-based imaging and spectroscopy analyses to characterize interactions among C compounds, microbes and minerals in a diverse array of soil microhabitats: litter layer, rhizosphere and deep soil. His research integrates soil science with modern microbiology, ecology, and geochemistry approaches–both in the lab and in the field–to address questions concerning the impacts of climate and land use change on soil processes and ecosystem functioning.
- Climate change impacts on soil carbon cycling and storage, specifically the influence of temperature on microbial carbon metabolism
- Plant-soil interactions, especially how rhizogenic weathering affects C dynamics in the subsoil
- The role of mineral-organic interactions (sorption, precipitation, aggregation) in soil carbon dynamics, specifically their formation and turnover.
- Redox coupling between reactive metals and carbon cycling, particularly the role of redox active metals in the abiotic and biotic breakdown of organic compounds.
Keiluweit, M., Nico, P.S., Harmon, M.E., Mao, J., Pett-Ridge, J., and Kleber, M. (2015) Long-term litter decomposition controlled by manganese redox cycling. Proceedings of the National Academy of Sciences 112(38):E5253–E5260.
Keiluweit, M., Bougoure, J., Nico, P.S., Weber, P., Pett-Ridge, J., and Kleber, M. (2015) Mineral protection of soil carbon counteracted by root exudates. Nature Climate Change 5: 588-595.
Kleber, M., Eusterhues, K., Keiluweit, M., Mikutta, C., Mikutta, R., and P.S. Nico. Mineral–Organic Associations: Formation, Properties, and Relevance in Soil Environments. Advances in Agronomy (in press)
Wiedemeier, D. B., Abiven, S., Hockaday, W.C., Keiluweit, M., Kleber, M. et al. (2014) Aromaticity and degree of aromatic condensation of char. Organic Geochemistry doi:10.1016/j.orggeochem.2014.10.002
Klüpfel, L., Keiluweit, M., Kleber, M. and M. Sander (2014) Redox properties of plant biomass-derived black carbon (biochar). Environmental Science & Technology 48, 5601–5611.
Heckman, K.A., Grandy, A.S., Gao, X., Keiluweit, M., Wickings, K., Carpenter, K., Chorover, J., and C. Rasmussen (2013) Sorptive fractionation of organic matter and formation of organo-hydroxy-aluminum complexes during litter biodegradation in the presence of gibbsite. Geochimica et Cosmochimica Acta 121:667-683
Michael C.M., Dabat-Blondeau, C., Unger, M., Sedlmair, S., Parkinson, D., Bechtel, H.A., Illman, B., Castro, J.M., Keiluweit, M., Nasse, J., and C.J. Hirschmugl (2013) Three-dimensional spectral imaging with synchrotron FTIR spectro-micro-tomography. Nature Methods 10:861-864
Liu, S.Y., Kleber, M.; Takahashi, L., Nico, P., Keiluweit, M., and M. Ahmed (2013) Synchrotron-based mass spectrometry to investigate the molecular properties of mineral-organic associations. Analytical Chemistry 85 (12):6100–6106
Keiluweit, M., Bougoure, J.J., Zeglin, L.H., Myrold, D.D., Weber, P.K., Pett-Ridge, J., Kleber, M., and P.S. Nico (2012) Nano-scale Investigation of the association of microbial nitrogen residues with iron (hydr) oxides in a forest soil O-horizon. Geochimica et Cosmochimica Acta 95:213–226
Keiluweit, M., Kleber, M., Sparrow, MA, Simoneit, B.R.T., and F.G. Prahl (2012) Solvent-extractable polycyclic aromatic hydrocarbons in biochar: Influence of Pyrolysis Temperature and Feedstock. Environmental Science & Technology 46:9333–9341
Keiluweit, M., P.S. Nico, M.G. Johnson, and M. Kleber (2010) Dynamic molecular nature of plant-biomass derived black carbon (biochar). Environmental Science & Technology 44:1247-1253
Keiluweit, M. and M. Kleber (2009) Molecular-level interactions in soils and sediments: The role of aromatic π-systems. Environmental Science & Technology 43(10):3421-3429