Professor of Soil Chemistry
Degree: Ph. D. 1983, Cornell University
Location: 108 Deering Hall
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Professional Interests: Organic matter chemistry, phosphorus soil chemistry, ion cyclotron mass spectrometry
Teaching: PSE 469 Soil Microbiology, PSE 580/581 Scientific Communication I/II
Research: My current research efforts focus on (1) chemically characterizing soil organic matter using ultrahigh resolution mass spectrometry and (2) determining the molecular-level chemical mechanisms governing dissolved organic matter and phosphorus reactions with soil mineral surfaces. Interest in carbon cycling in soils has recently increased greatly due to the effects of both carbon dioxide and methane on global climate. Carbon sequestration in soils has been proposed as a strategy to moderate increasing levels of both gasses in the atmosphere. Understanding the chemistry of soil organic matter is important for understanding the factors that stabilize carbon in soils. In addition, this knowledge is key to understanding biogeochemical mechanisms of phosphorus cycling through both agricultural and forested ecosystems. These studies will contribute to a more accurate understanding of how management systems can be used to enhance the bio-availability of phosphorus and reduce adverse environmental impacts due to excessive phosphorus loading to soils.
Recent Publications [available through ResearchGate]:
Coward, E.K., T. Ohno, and D.L. Sparks. 2019. Direct evidence for temporal molecular fractionation of dissolved organic matter at the iron oxyhydroxide interface. Environ. Sci. Technol. 53:642-650.
Ohno, T., and G.M. Hettiarachchi. 2018. Soil chemistry and the One Health Initiative: Introduction to the special section. J. Environ. Qual. 47:1305-1309.
Caricasole, P., P.G. Hatcher, and T. Ohno. 2018. Biodegradation of crop residue-derived organic matter is influenced by its heteroatomic stoichiometry and molecular composition. Appl. Soil Ecol. 130:21-25.
Patel, K., C. Tatariw, J.D. MacRae, T. Ohno, S.J. Nelson, and I.J. Fernandez. 2018. Soil C and N responses to snow removal and concrete frost in a northern coniferous forest. Can. J. Soil Sci. 98:436-447.
Ohno, T., R.L. Sleighter, and P.G. Hatcher. 2018. Adsorptive fractionation of corn, wheat, and soybean crop residue derived water-extractable organic matter on iron (oxy)hydroxide. Geoderma 326:156-163.
Chase, A.J., M.S. Erich, and T. Ohno. 2018. Bioavailability of phosphorus on iron (oxy)hydroxide not affected by soil amendment-derived organic matter. Agric. Environ. Lett. 3:170042.
Coward, E., T. Ohno, and A. Plante. 2018. Adsorption and molecular fractionation of dissolved organic matter on iron-bearing mineral matrices of varying crystallinity. Environ. Sci. Technol. 56:1036-1044.
Ohno, T., K.A. Heckman, A.F. Plante, I.J. Fernandez, T.B. Parr. 2017. 14C mean residence time and its relationship with thermal stability and molecular composition of soil organic matter: A case study of deciduous and coniferous forest types. Geoderma 308:1-8.
Chassé, A.W. and T. Ohno. 2016. Higher molecular mass organic matter molecules compete with orthophosphate for adsorption to iron (oxy)hydroxide. Environ. Sci. Technol. 50:7461-7469.
Ohno, T., R.L. Sleighter, P.G. Hatcher. 2016. Comparative study of organic matter chemical characterization using negative and positive mode electrospray ionization ultrahigh resolution mass spectrometry. Anal. Bioanal. Chem. 408:2497-2504.
Boeira de Oliveira, C.M., M.S. Erich, L.C. Gatiboni, T. Ohno. 2015. Phosphorus fractions and organic matter chemistry under different land use on humic Cambisols in Southern Brazil. Geoderma Region. 5:140-149.
Chassé, A.W., T. Ohno, S.R. Higgins, A. Amirbahman, N. Yildirim, and T.B. Parr. 2015. Chemical Force Spectroscopy Evidence Supporting the Layer-by-Layer Model of Organic Matter Binding to Iron (oxy)Hydroxide Mineral Surfaces. Environ. Sci. Technol. 49:9733-9741.
Parr, T.B., C.S. Cronan, T. Ohno, S.E.G. Findlay, S.M.C. Smith, and K.S. Simon. 2015. Urbanization changes the composition and bioavailability of dissolved organic matter in headwater streams. Limnol. Oceanogr. 60:885-900.
Parr, T.B., T. Ohno, K.S. Simon, C.S. Cronan. 2014. comPARAFAC: A library and tools for rapid and quantitative comparison of dissolved organic matter components resolved by PARAFAC analysis. Limnol. Oceanogr. Methods. 12:114-125.