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Journal Article
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.
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.
V. Hernandez-Santana, Zhou, X., Helmers, M. J., Asbjornsen, H., Kolka, R., and Tomer, M., Native prairie filter strips reduce runoff from hillslopes under annual row-crop systems in Iowa, USA, Journal of HydrologyJournal of Hydrology, vol. 477, pp. 94-103, 2013.
M. Perez-Suarez, Castellano, M. J., Kolka, R., Asbjornsen, H., and Helmers, M., Nitrogen and carbon dynamics in prairie vegetation strips across topographical gradients in mixed Central Iowa agroecosystems, Agriculture, Ecosystems, and Environment, vol. 188, p. 11, 2014.
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.
J. Gutierrez-Lopez, Asbjornsen, H., Helmers, M., and Isenhart, T., Regulation of soil moisture dynamics in agricultural fields using strips of native prairie vegetation, Geoderma, vol. 226, pp. 238-249, 2014.
M. J. Helmers, Zhou, X., Asbjornsen, H., Kolka, R., Tomer, M. D., and Cruse, R. M., Sediment removal by prairie filter strips in row-cropped ephemeral watersheds, Journal of environmental quality, vol. 41, pp. 1531-1539, 2012.
H. Asbjornsen, Hernandez-Santana, V., Liebman, M., Bayala, J., Chen, J., Helmers, M., Ong, C. K., and Schulte, L. A., Targeting perennial vegetation in agricultural landscapes for enhancing ecosystem services, Renewable Agriculture and Food Systems, vol. 29, pp. 101-125, 2014.
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.
M. J. Helmers, Zhou, X., Asbjornsen, H., and Kolka, R., Water quality benefits of perennial filter strips in row-cropped watersheds, 2011.