Thomas Isenhart

515-294-8056
isenhart@iastate.edu

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

Teaching

NREM 130, Natural Resources and Agriculture
AEcl/Biol 312, Ecology
AEcl 418/518, Stream Ecology

Research

Dr. Isenhart’s research interests include stream, riparian, and watershed management; design and establishment of conservation buffers to improve the environmental efficiency of agriculture, land use/hydrology and stream bed and bank erosion; watershed assessment; and land use and greenhouse gas emissions.

Publications

Fisher, J.R., M.C. Quist, S.L. Wigen, A.J. Schaefer, T.W. Stewart, and T.M. Isenhart.  Accepted.  Assemblage and population level responses of stream fish to riparian buffers at multiple spatial scales.  Transactions of the American Fisheries Society.

Kim, D., T.M. Isenhart, T.B. Parkin, R.C. Schultz, and T.E. Loynachan.  In Press.  Methane flux in riparian forest buffer, warm-season and cool-season grass filter, and adjacent crop fields soils.  Journal of Environmental Quality.

Schultz, R.C., T.M. Isenhart, J.P Colletti, W.W. Simpkins, R.P. Udwatta, and P.L. Schultz.  2009.  Riparian and Upland Buffer Practices.  Chapter 8 In: H.E. Garrett, (Ed.) North American Agroforestry: An integrated Science and Practice, 2nd Ed.  American Society of Agonomy, Madison, WI.

Schilling, K.E., J.A. Palmer, E.A. Bettis III, P. Jacobson, R.C. Schultz, and T.M. Isenhart.  2009.  Vertical distribution of total carbon, nitrogen and phosphorus in riparian soils of Walnut Creek, southern Iowa.  Catena 77(3):266-273.

Helmers, M.J., T.M. Isenhart, M. Dosskey, S. Dabney, and J. Strock.  2008.  Buffers and vegetative filter strips.  Pp. 43-58 In: Gulf Hypoxia and Local Water Quality Concerns.  ASABE.  St. Joseph, MI.

Zaimes, G.N., R.C. Schultz, and T.M. Isenhart.  2008a.  Streambank soil and phosphorus losses under different riparian land-uses in Iowa.  Journal of the American Water Resources Association 44: 935-947.

Zaimes, G.N., R.C. Schultz, and T.M. Isenhart. 2008b. Total phosphorus concentrations and compaction in riparian areas under different riparian land-uses of Iowa.  J. Agric. Ecosyst. & Environ. 127:22-30.

Helmers, M.J., T.M. Isenhart, C.L. Kling, T.M. Moorman, W.W. Simpkins, and M. Tomer.  2007.  Water quality in agriculture: heterogeneity of pollutants, practices, and programs.  Choices 22(2):79-85.

Schilling, K.E., M. Tomer, P. Gassman, C. Kling, T.M. Isenhart, T. Moorman, W.W. Simpkins, and C.F. Wolter.  2007.  A tale of three watersheds: Non-point source pollution and conservation practices across Iowa.  Choices 22(2):87-95.

Duehr, J., M. Siepker, C. Pierce, and T.M. Isenhart.  2007.  Relation of riparian buffer strips to in-stream habitat, macroinvertebrates and fish in a small Iowa stream. Journal of the Iowa Academy of Science 113:49-55.

Lowrance, R., T.M. Isenhart, W.J. Gburek, F.D. Shields, Jr., P.J. Wigington, Jr., and S.M. Dabney.  2006.  Landscape Management Practices.  Chapter 7 In: M. Schnepf and C. Cox (Eds.) Environmental Benefits of Conservation on Cropland: The Status of Our Knowledge.  Soil and Water Conservation Society.  Ankeny, IA.

Zaimes, G.N., R.C. Schultz, and T.M. Isenhart.  2006.  Riparian land uses and precipitation influences on stream bank erosion in Central Iowa.  Journal of the American Water Resources Association 42(1):83-97.

Herring, J.P., R.C. Schultz, and T.M. Isenhart.  2006.  Watershed scale inventory of existing riparian buffers in Northeast Missouri using GIS.  Journal of the American Water Resources Association 42(1):145-155.

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 Systems 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.