University of California, Riverside

Environmental Sciences

Robert C. Graham

Robert C. Graham

Robert Graham Photograph

Professor of Soil Mineralogy

Academic Degrees:

  • Ph.D., North Carolina State University, 1986
  • M.S., Utah State University, 1982
  • B.S., University of California, Davis, 1976


  • Weathering, properties, and behavior of soil minerals
  • Soil genesis and geomorphology
  • Ecosystem roles of soils and weathered bedrock
  • Wildland soils
  • Morphologic and micromorphologic interpretations of soil age

Representative Publications:

  • Pietrasiak, N., Drenovsky, R.E., Santiago, L.S., Graham, R.C. 2013. Biogeomorphology of a Mojave Desert landscape - Configurations and feedbacks of abiotic and biotic land surfaces during landform evolution. Geomorphology (in press).
  • Wald, J.A., Graham, R.C., Schoeneberger, P.J. 2013. Distribution and properties of soft weathered bedrock at 1m depth in the contiguous United States. Earth Surface Processes and Landforms 38:614-626.
  • Briggs, C., J.M. Breiner, and R.C. Graham. 2012. Physical and chemical properties of Pinus ponderosa charcoal: Implications for soil modification. Soil Sci. 177:263-268.
  • Hirmas, D.R., R.C. Graham, and K.J. Kendrick. 2011. Soil-geomorphic significance of land surface characteristics in an arid mountain range, Mojave Desert, USA. Catena 87:408-420.
  • Turk, J.K., and R.C. Graham. 2011. Distribution and properties of vesicular horizons in the western United States. Soil Sci. Soc. Am. J. 75:1449-1461.
  • Hirmas, D.R., and R.C. Graham. 2011. Pedogenesis and soil-geomorphic relationships in an arid mountain range, Mojave Desert, California. Soil Sci. Soc. Am. J. 75:192-206.
  • Graham, R.C., A.M. Rossi, and K.R. Hubbert. 2010. Rock to regolith conversion: producing hospitable substrates for terrestrial ecosystems. GSA Today 20:4-9.
  • Graham, R.C., and A.T. O’Geen. 2010. Soil mineralogy trends in California landscapes. Geoderma 154:418-437.
  • Turk, J.K., and R.C. Graham. 2009. Soil carbon and nitrogen accumulation in a forested debris flow chronosequence, California. Soil Sci. Soc. Am. J. 73:1504-1509.
  • Graham, R.C., D.R. Hirmas, Y.A. Wood, and C. Amrhein. 2008. Large near-surface nitrate pools in soils capped by desert pavement in the Mojave Desert, California. Geology 36:259-262.
  • Goforth, B.R., R.C. Graham, K.R. Hubbert, C.W. Zanner, R.A. Minnich. 2005. Spatial distribution and properties of ash and thermally altered soils after high-severity forest fire, southern California. Int. J. Wildland Fire 14:343-354.

Courses Taught:

  • ENSC/SWSC 100: Introduction to Soil Science
  • SWSC/ENSC/GEO 138: Soils of Natural Ecosystems and Landforms

Graduate Program Affiliations and Research Focus Areas:


  • Fellow, Soil Science Society of America (2003)
  • UCR Doctoral Dissertation Advisor/Mentor Award (2006)
  • UC Presidential Award for Excellence in Directing Undergraduate Research (1995)


More Information

General Campus Information

University of California, Riverside
900 University Ave.
Riverside, CA 92521
Tel: (951) 827-1012

Department Information

Environmental Sciences
Geology 2460

Tel: (951) 827-5116
Fax: (951) 827-4652