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Journal Article
M. J. Helmers, Zhou, X., Asbjornsen, H., and Kolka, R., Water quality benefits of perennial filter strips in row-cropped watersheds, 2011.
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.
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.
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.
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.
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.
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.
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.
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.
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.