Thomas Isenhart

Department of Natural Resource Ecology & Management
339 Science II, Iowa State University
Ames, Iowa 50011-3221
Office: 515-294-8056
FAX: 515-294-2995

e-mail: isenhart@iastate.edu

Degrees:
B.S. in Botany and Environmental Studies, Iowa State University, 1983
M.S. in Water Resources, Iowa State University, 1988
Ph.D. in Water Resources, Iowa State University, 1992

Research:
Dr. Isenhart's research interests include stream ecosystem management, design and establishment of landscape buffers to improve the environmental efficiency of agriculture, biogeochemistry of nitrogen in agroecosystems, transformation and fate of nitrate in freshwater systems, and the physical and chemical interactions between groundwater and surface water.

Teaching:
Research Methods in Ecology (A Ecl 580)
Natural Resource Management in Agricultural Landscapes (NREM 130).

Selected Publications:
Schultz, R.C., T.M. Isenhart, W.W. Simpkins, and J.P. Colletti. 2004. Riparian forest buffers in agroecosystems – lessons learned from the Bear Creek Watershed, central Iowa, USA. Agroforestry 61:35-50.

Marquez, C.O., V.J. Garcia, C.A. Cambardella, R.C. Schultz, and T.M. Isenhart. 2004. Aggregate-size stability distribution and soil stability. Soil Sci. Soc. Am. J. 68:725-735.

Zaimes, G.N., R.C. Schultz, and T.M. Isenhart. 2004. Stream bank erosion adjacent to riparian forest buffers, row-cropped fields, and continuously grazed pastures along Bear Creek in central Iowa. J. Soil and Water Conserv. 59(1):19-27.

Isenhart, T., W. Crumpton, D. Lemke, J. Baker, and S. Melvin. 2003. Wetlands for water quality in agricultural landscapes: The Iowa Conservation Reserve Enhancement Program. In: Kolpin, Dana and John D. Williams (Editors). Agricultural Hydrology and Water Quality. AWRA’s 2003 Spring Specialty Conference Proceedings. American Water Resources Association, Middleburg, Virginia, TPS-03-1, CD-ROM.

Simpkins W.W., T. R. Wineland, T. M. Isenhart, and R. C. Schultz. 2003. Hydrologic setting controls NO3--N removal in groundwater beneath multi-species riparian buffers. In: Kolpin, Dana and John D. Williams (Editors). Agricultural Hydrology and Water Quality. AWRA’s 2003 Spring Specialty Conference Proceedings. American Water Resources Association, Middleburg, Virginia, TPS-03-1, CD-ROM.

Tufekcioglu A., J.W. Raich, T.M. Isenhart and R.C. Schultz. 2003. Biomass, carbon and nitrogen dynamics of multi-species riparian buffers within an agricultural watershed in Iowa, USA. Agroforestry Systems 57:187-198.

Tomer, M.D., D.E. James, and T.M. Isenhart. 2003. Optimizing the placement of riparian practices in a watershed using terrain analysis. J. Soil and Water Conserv. 58(4):198-206.

Lee, K.H., T.M. Isenhart, and R.C. Schultz. 2003. Sediment and nutrient removal in an established multi-species riparian buffer. J. Soil and Water Conserv. 58(1):1-8.

Bharati, L., K.H. Lee, T.M. Isenhart, and R. C. Schultz. 2002. Soil-water infiltration under crops, pasture and established riparian buffer in Midwestern USA. Agroforestry Systems 56:249-257.

Dornbush, M. E., T. M. Isenhart and J. W. Raich. 2002. Quantifying fine-root decomposition: An alternative to buried litterbags. Ecology 83(11):2985-2990.

Simpkins, W.W., T.R. Wineland, R.J. Andress, D.A. Johnston, G.C. Caron, T.M. Isenhart and R.C. Schultz. 2002. Hydrogeological constraints on riparian buffers for reduction of diffuse pollution: examples from the Bear Creek Watershed in Iowa, USA. Water Science and Technology 45(5):61-68.

Lee, K.H., T.M. Isenhart, R.C. Schultz and S.K. Mickelson. 2000. Multispecies riparian buffers trap sediment and nutrients during rainfall simulations. J. Environ. Qual. 29:1200-1205.

Tufekcioglu, A., J.W. Raich, T.M. Isenhart and R.C. Schultz. 2001. Soil respiration in riparian buffers and adjacent croplands. Plant and Soi. 229:117-124.

Isenhart, T.M., R.C. Schultz, and J.P. Colletti. 1997. Watershed restoration and agricultural practices in the Midwest: Bear Creek in Iowa. Chapter 15 In: J.E. Williams, M.P. Dombeck, and C.A. Woods (Eds.). Watershed Restoration: Principles and Practices. American Fisheries Society.
Crumpton, W.G., T.M. Isenhart and P.D. Mitchell. 1992. Nitrate and organic N analyses with second derivative spectroscopy. Limnology and Oceanography 37(4):907-913.

Isenhart, T.M. and W.G. Crumpton. 1989. Transformation and loss of nitrate in an agricultural stream. Journal of Freshwater Ecology 5:123-129.