Publications

2011
M. E. Jarchow and Liebman, M., “Maintaining multifunctionality as landscapes provide ecosystem services”, Frontiers in Ecology and the Environment, vol. 9, pp. 262-262, 2011.
M. J. Helmers, Zhou, X., Asbjornsen, H., and Kolka, R., “Water quality benefits of perennial filter strips in row-cropped watersheds”, 2011.
2010
R. M. Maher, Asbjornsen, H., Kolka, R. K., Cambardella, C. A., and Raich, J. W., “Changes in soil respiration across a chronosequence of tallgrass prairie reconstructions”, Agriculture, ecosystems & environment, vol. 139, pp. 749-753, 2010.
M. Perez-Bidegain, Helmers, M. J., and Cruse, R., “Modeling phosphorus transport in an agricultural watershed using the WEPP model”, Journal of Environmental Quality, vol. 39, pp. 2121-2129, 2010.
X. Zhou, Helmers, M. J., Asbjornsen, H., Kolka, R., and Tomer, M. D., “Perennial filter strips reduce nitrate levels in soil and shallow groundwater after grassland-to-cropland conversion”, Journal of environmental quality, vol. 39, pp. 2006-2015, 2010.
2009
A. M. Roberts, Helmers, M. J., and Fillery, I. R. P., “The adoptability of perennial-based farming systems for hydrologic and salinity control in dryland farming systems in Australia and the United States of America”, Crop and Pasture Science, vol. 60, pp. 83-99, 2009.
2008
G. Arbuckle J Jr, Helmers, M. J., Liebman, M. Z., and Schulte, L. A., “From vulnerability to resiliency: Iowa agriculture in the age of biorenewables”, 2008.
S. Secchi, Tyndall, J., Schulte, L. A., and Asbjornsen, H., “High crop prices and conservation: Raising the stakes”, Journal of Soil and Water Conservation, vol. 63, p. 68A-73A, 2008.PDF icon Secchi et al. 2008 JSWC.pdf (968.32 KB)
H. Asbjornsen, Shepherd, G., Helmers, M., and Mora, G., “Seasonal patterns in depth of water uptake under contrasting annual and perennial systems in the Corn Belt Region of the Midwestern US”, Plant and Soil, vol. 308, pp. 69-92, 2008.
L. A. Schulte, Asbjornsen, H., Atwell, R. C., Hart, C., Helmers, M., Isenhart, T., Kolka, R., Liebman, M., Neal, J., O'Neal, M., Schultz, R., Secchi, S., Thompson, J., Tomer, M., and Tyndall, J., “Targeted conservation approaches for improving water quality: Multiple benefits for expanded opportunities”, Iowa State University, Ames, Iowa, PMR 1002, 2008.PDF icon Schulte et al. 2008 ISUExt.PMR1002.pdf (2.12 MB)
2007
M. Perez-Bidegain, “Modeling phosphorus transport using the WEPP model”, Iowa State University, 2007.
R. Matthew Maher, “Soil respiration and plant growth across a chronosequence of tallgrass prairie reconstructions”, 2007.
M. Renee Cheatham, “Species and functional diversity effects on productivity and nutrient uptake: implications for designing sustainable agricultural systems in the Midwest”, 2007.
H. Asbjornsen, Mora, G., and Helmers, M. J., “Variation in water uptake dynamics among contrasting agricultural and native plant communities in the Midwestern US”, Agriculture, ecosystems & environment, vol. 121, pp. 343-356, 2007.
2006
L. A. Schulte, Asbjornsen, H., Liebman, M., and Crow, T. R., “Agroecosystem restoration through strategic integration of perennials”, Journal of Soil and Water Conservation, vol. 61, p. 164A-169A, 2006.
G. William Shepherd, “A comparative agroecosystems analysis of soil water and root dynamics under six different vegetative cover types”, 2006.

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