Last update: 2007-02-20 17:19:14

Kent C. Keller

Washington State University
Department of Geology
Pullman, WA 99164-2812
Telephone: 509-335-3040
FAX: 509-335-7816


  • Ph.D., University of Waterloo, Earth Science (Hydrogeology), 1988;
  • B.S., Stanford University, Geology (Distinction; Phi Beta Kappa), 1977.
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    Professional Positions:
  • Assistant and Associate Professor, Department of Geology, Washington State University, 1988-present;
  • Visiting Professor, Hydrology Program, New Mexico Institute of Mining and Technology, 1994-1995;
  • Consulting Researcher, Sedimentary Resources Division, Saskatchewan Research Council, Saskatoon, Saskatchewan, 1985-1987;
  • Consultant, Water and Sanitation for Health Project, U.S. Agency for International Development, 1982-1983.

  • Research Interests and Activities:
    C. Kent Keller has been working at the Hubbard Brook Experimental Forest since 1995 studying flow and geochemistry of the "Sandboxes", experimental ecosystems established in 1983 to study nitrogen fixation by forest species. Keller is Principal Investigator on the project, Vadose-Hydrogeologic Study of the Effect of Plants on Chemical Weathering (funded by NSF), with primary responsibility (with graduate students Rachel O’Brien and Dan Strobridge) for datasets on porewater chemistry and vadose water potential, water content, and temperature in the Sandboxes, as well as Sandbox discharge and selected water-chemical parameters on that discharge, from 1996-present. General research interests in the biogeochemistry of and carbon cycling in the vadose zone.

    Selected Publications:

    Bacon, D.H. and C.K. Keller. 1999. Soil respiration and georespiration distinguished by transport analyses of vadose CO2, 13CO2, and 14CO2. Submitted for Publication.

    Berner, R. A., J.-L. Rao, S. Chang, R. O’Brien and C. K. Keller. 1999. Seasonal variability of adsorption and exchange equilibria in soil waters. Aquatic Geochemistry 4: 273-290.

    Keller, C. K. and R. O’Brien. 1999. The lithosphere as a global sink: an evaluation using Sandbox ecosystems. (In Preparation)

    Keller, C. K. and D. Strobridge. 1999. Measurement and modeling of vadose zone hydrodynamics in Sandbox ecosystems. (In Preparation)

    O’Brien, R. C. K. Keller and R. A. Berner. 1999. Chemical weathering in experimental ecosystems: bicarbonate patterns. (In Preparation)

    Crum, R., E.M. Murphy and C.K. Keller. 1996. A non-adsorptive method for the isolation and fractionation of natural dissolved organic carbon. Water Research 30(5):1304-1311.

    O’Brien, R., C.K. Keller and J. Smith. 1996. Multiple tracers of shallow ground-water flow and recharge in hilly loess. Ground Water 34(4):675-682.

    Keller, C.K. and B.D. Wood. 1993. Possibility of chemical weathering before the advent of vascular land plants. Nature 364:223-225.

    Wood, B.D., C.K. Keller and D.L. Johnstone. 1993. In-situ measurement of microbial activity and microbial production of CO2 in the unsaturated zone. Water Resources Research 29(3):647-659.

    Severson, K.J., D.L. Johnstone, C.K. Keller and B.D. Wood. 1992. Hydrogeologic parameters affecting vadose-zone microbial distributions. Geomicrobiology Journal 9:197-216.

    Keller, C.K. and G. van der Kamp. 1992. Slug tests with storage due to entrapped air. Ground Water 30(1):2-7.

    Geyer, D.J., C.K.Keller, J.L. Smith and D.L. Johnstone. 1992. Subsurface fate of nitrate as a function of depth and landscape position in Missouri Flat Creek watershed, USA. Journal Contam. Hydrology 11(2):127-148.

    Keller, C.K. 1991. Hydrogeochemistry of a clayey till II. Sources of CO2. Water Resources Research 27(10):2555-2564.

    Keller, C.K., G. van der Kamp and J.A. Cherry. 1991. Hydrogeochemistry of a clayey till, I. Spatial variability. Water Resources Research 27(10):2543-2554.

    Title at Hubbard Brook:
    Principal Investigator