Meet the External Collaborators

Richard Schultz, Ph.D.

242 Sciences II
Ames, IA 50011
(515) 294-7602
rschultz@iastate.edu

Professional interests include riparian ecology, management and restoration, especially in agricultural landscapes, hydrology and soils, agroforestry. Research emphasis focuses on the design and function of riparian management systems that reduce the movement and remediate the impact of non-point source pollutants from croplands and pastures to adjacent streams. Presently we are also studying the impact of riparian buffers on stream bank stability and quantifying the proportion of stream sediment that originates from bank erosion and surface erosion. Most of our buffer designs use perennial woody and forb species that are functionally effective and provide potential alternative income to land owners. An area of study includes quantifying the biomass production potential of buffers for carbon sequestration and use in the burgeoning bio-energy field. Please visit our web site at: http://www.buffer.forestry.iastate.edu/.

Publications

• Berges, S.A., L.A. Schulte Moore, T.M. Isenhart, and R.C. Schultz. 2010. Bird species diversity in riparian buffers, row crop fields and grazed pastures within agriculturally dominated watersheds. Agroforestry Systems 79:97-110.
• Kim, D.G., T.M. Isenhart, T.B. Parkin, R.C. Schultz, and T.E. Loynachan. 2010. Methane flu in cropland and adjacent riparian buffers with different vegetation covers. Journal of Environmental Quality 39:97-105.
• Knight, K.W., R.C. Schultz, C.M. Mabry, and T.M. Isenhart. 2010. Natural riparian forest buffers with and without planted grass filter as buffers of concentrated flo from row crop fields. Journal of the American Water Resources Association 46(2):311-322.
• Webber, D.F., S.K. Mickelson, S.I. Ahmed, J.R. Russell, W.J. Powers, R.C. Schultz, and J.L. Kovar. 2010. Livestock grazing and vegetative filter strip buffer effects on runoff sediment, nitrate, and phosphorus losses. Journal of Soil and Water Conservation 65(1):34-41.
• Berges, S.A., L.A. Schulte, T.M. Isenhart, and R.C. Schultz. "Bird species diversity in riparian buffers, row-crop fields and grazed pastures of two agriculturally dominated watersheds." In M.A. Gold and M.M. Hall (eds.). 2009. Agroforestry Comes of Age: Putting Science into Practice. Proceedings, 11th North American Agroforestry Conference. 287-296.
• Isenhart, T.M. D-G. Kim, and R.C. Schultz. "Emission of the greenhouse gas nitrous oxide from riparian forest buffers, warm-season and cool-season grass filters, and crop fields." In M.A. Gold and M.M. Hall (eds.). 2009. Agroforestry Comes of Age: Putting Science into Practice. Proceedings, 11th North American Agroforestry Conference. 143-153.
• Knight, K.W., R.C. Schultz, C.M. Mabry, and T.M. Isenhart. "Riparian forests with and without grass filters as buffers of concentrated flow from crop fields." In M.A. Gold and M.M. Hall (eds.). 2009. Agroforestry Comes of Age: Putting Science into Practice. Proceedings, 11th North American Agroforestry Conference. 365-375.
• 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 doi:10.1016/j.catena.2009.02.006
• Schultz, R.C., R.P. Udawatta, T.M. Isenhart, J.P. Colletti, and W.W. Simpkins. "Riparian and upland buffer practices."
• In Garrett, H.E. (ed.). 2009. North American Agroforestry: An Integrated Science and Practice. 2nd Edition. Agronomy Society of America, Madison, Wis. Chapter 8.
• Willett, C.C., S.A. Berges, R.N. Lerch, and R.C. Schultz. "Streambank erosion rates of small Missouri streams." In M.A. Gold and M.M. Hall (eds.). 2009. Agroforestry Comes of Age: Putting Science into Practice. Proceedings, 11th North American Agroforestry Conference. 17-26.
• Herring, J., R.C. Schultz and T.M. Isenhart. 2006. Watershed-scale inventory of existing riparian buffers in northeast Missouri using GIS. Journal of American Water Resources Association 42:145-155.
• 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 American Water Resources Association 42:83-97.
• Abdelkadir, A. and R.C. Schultz. 2005. Water harvesting in a 'runoff-catchment' agroforestry system in the dry lands of Ethiopia. Agroforestry Systems 63:291-298
• 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. Journal of Soil and Water Conservation 59:19-27.
• Tufekcioglu, A., J.W. Raich, T.M. Isenhart, and R.C. Schultz. 2003. Biomass, carbon and nitrogen dynamics of multi-species riparian buffer zones within an agricultural watershed in Iowa, USA. Agroforestry Systems 57:187-198.
• 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 buffer zones within an agricultural watershed in Iowa, USA. Agroforestry Systems 57:187-198.
• Lee, Kye-Han, Thomas M. Isenhart, and Richard C. Schultz. 2003 Sediment and nutrient removal in an established multi-species riparian buffer. Journal of Soil and Water Conservation 58: 1-8.
• Lee, Kye-Han, Thomas M. Isenhart, and Richard C. Schultz. 2002. Sediment and nutrient removal in an established multi-species riparian buffer. (Accepted) Journal of Soil and Water Conservation.
• Bharati, L. K-H Lee, T.M. Isenhart, and R. C. Schultz. 2002 Riparian zone soil-water infiltration under crops, pasture and established buffers. (Accepted) Agroforestry Systems.
• Lowrance, R., S. Dabney, R. Schultz. 2002. Improving water and soil quality with conservation buffers. J. Soil and Water Conservation 57:36A-43A.
• Simpkins, W.W., T. R. Wineland, R. J. Anders, D. A. Johnston, 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. Journal of Water Science and Technology 45:61-68.
• Tufekcioglu, A., J.W. Raich, T.M. Isenhart and R.C. Schultz. 2001. Soil respiration within riparian buffers and adjacent crop fields. Plant and Soil 229:117-124.
• Schultz, R.C., J.P. Colletti, T.M. Isenhart, C.O. Marquez, W.W. Simpkins and C.J. Ball. 2000. Riparian forest buffer practices. Chapter 7 pp 189-282; in: Garrett, H.E., W.J. Rietveld and R.F. Fisher (eds.) North American Agroforestry: An integrated science and practices. American Society of Agronomy, Madison, WI. 402 pp.
• Lee, K. T.M. Isenhart, R.C. Schultz, and S.K. Mickelson. 2000 Multi-species riparian buffer system in Central Iowa for controlling sediment and nutrient losses during simulated rain. J. Environ. Qual. 29: 1200-1205.
• Lee, K., T.M. Isenhart, R.C. Schultz, and S.K. Mickelson. 1999. Sediment and nutrient trapping abilities of switchgrass and bromegrass buffer strips. Agroforestry Systems 44:121-132.
• Marquez, C.O., C.A. Cambardella, T.M. Isenhart, and R.C. Schultz. 1999. Assessing soil quality in a riparian buffer strip system by testing organic matter fractions. Agroforestry Systems 44: 133-140.
• Tufekcioglu, A., J. W. Raich, T.M. Isenhart, and R. C. Schultz. 1999. Fine root dynamics, coarse root biomass, root distribution and soil respiration in a multispecies riparian buffer in Central Iowa, USA. Agroforestry Systems 44:163-174.
• Isenhart, T.M., R.C. Schultz and J.P. Colletti. 1998. Watershed restoration and agricultural practices in the Midwest: Bear Creek of Iowa. Chapter 19, pp 318-334. In: Williams, J.E., C.A. Wood and M.P. Dombeck, Eds. Watershed Restoration: Principles and Practices. American Fisheries Society, Bethesda, MD. 561 pp.
• Schultz, R.C. and J.R. Thompson. 1997. Effect of density control and undercutting on root morphology of 1+0 bareroot hardwood seedlings: five-year field performance of root-graded stock in the central USA. New Forests 13: 301-314.
• Reichenbacker, R.R., E. R. Hart, and R.C. Schultz. 1996. Artificial defoliation effect on Populus growth, biomass production, and total nonstructural carbohydrate concentration. Environmental Entomology: 25: 632-642.
• Schultz, R.C., J.P. Colletti, R. R. Faltonson. 1995. Agroforestry opportunities for the United States of America. Agforestry Systems 31:117-132.
• Schultz, R.C., J.P. Colletti, T.M. Isenhart, W.W. Simpkins, C.W. Mize and M.L. Thompson. 1995. Design and placement of a multi- species riparian buffer strip system. Agroforestry Systems 31:117- 132.
• Schultz, R.C., J.P. Collett, W. W. Simpdins, C.W. Mize, and M.L. Thompson. 1995. Composition, placement, and design of a multi-species riparian buffer strip. Agroforestry Systems 29:201-226.
• Schultz, R.C., T.M. Isenhart, and J.P. Colletti. 1995. Riparian buffer systems in crop and rangeland. Pages 13-27 in Agroforestry and Sustainable Systems: Symposium Proceeding. USDA-Forest Service General Technical Report RM-GTR-261.
• Thompson, J.R. and R.C. Schultz. 1995. Root system morphology of Quercus rubra L. planting stock and 3-year field performance in Iowa. New Forests 9:225-236.
• Schultz, R.C., J.P. Colletti, R.R. Faltonson. 1995. Agroforestry opportunities for the United States of America. Agroforestry Systems 31:117-132.
• Schultz, R.C., J.P. Colletti, W.W. Simpkins, C.W. Mize, M.L. Thompson. 1995. Composition, placement, and design of a multi- species riparian buffer strip. Agroforestry Systems 29:201-226.
• Rule, L.C., J.P. Colletti, T.P. Liu, S.E. Jungst, C.W. Mize, and R.C. Schultz. 1994. Agroforestry and forestry-related practices in the Midwestern United States. Agroforestry Systems 26:1-10.
• Schultz, R.C., T.M. Isenhart, and J.P. Colletti. 1994. Riparian buffer systems in crop and rangelands. In: Agroforestry and Sustainable Systems: Symposium Proceedings. USDA For. Ser. Gen Tech Rpt RM-GTR-261. pp13-28.
• Meilan, R.R. Horgan, J.K. Heald, C.E. LaMotte, and R.C. Schultz. 1993. Identification of the cytokinins in red pine seedlings. Plant Growth Regulation 13:169-178.
• Colletti, J.P., R.B. Hall and R.C. Schultz. 1991. Hickory Grove an Iowa example of short-rotation woody crops in Agroforestry. Forestry Chronicle 67:258-262.
• Schultz, R.C. and J. R. Thompson. 1990. Nursery practices that improve hardwood seedling root morphology. Tree Planter's Notes 41:21-32.

Extension Bulletins

• Stewards of our Streams: Riparian buffer systems. Pm-1626a, April, 1996. Iowa State University Extension, Ames, Iowa
• Stewards of our streams: Buffers strip design, establishment and maintenance. Pm-1626b, April 1997. Iowa State University Extension, Ames, Iowa.
• Stewards of our streams: Maintenance of riparian buffers. Pm1626c, March, 2002. Iowa State University Extension, Ames, Iowa
• Riparian buffers for agricultural land. Agroforestry Notes (AF Note- 3). January, 1997. National Agroforestry Center, Lincoln, Nebraska.
• How to design a riparian buffer for agricultural land. Agroforestry Notes (AF Note-4). January, 1997. National Agroforestry Center, Lincoln, Nebraska.
• A riparian buffer design for cropland. Agroforestry Notes (AF Note- 5). January, 1997. National Agroforestry Center, Lincoln, Nebraska.