Effects of Roadside Deposition on Growth and Pollutant Accumulation by Willow (Salix miyabeana)
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Roadside plants have the potential to accumulate pollutants and safeguard waterways. To assess growth and pollutant accumulation of roadside plants, the willow Salix miyabeana was grown (a) in a greenhouse on soil collected at different distances from an interstate highway to test the longer-term effects of pollutant deposition as manifested in soil, and (b) in the field on reference soil placed at different distances from that highway to test the shorter-term effects of proximity to pollutant sources during a single growing season. In the first experiment, relative growth rate (RGR) increased 150 % with distance of soil collection from the roadway, from a baseline near the highway to 100 m away. Relative nitrogen and phosphorus accumulation rates were positively correlated with RGR (P <0.0001), and total contents of zinc, strontium, copper, nickel, cadmium, and lead in new shoots were also positively correlated with RGR (P <0.05). Thus more rapidly growing plants accumulated more N, P, and metals. Reduced growth for plants grown on soils collected near the roadway was associated with very high tissue concentrations of sodium and soil concentrations of chloride, implicating the deposition of deicing agents in this northern temperate roadside ecosystem. In contrast, S. miyabeana showed the opposite pattern on reference soil in the field, with RGR decreasing 31 % as distance from the roadside increased. The latter trend appears to have resulted from greater soil moisture and reduced shading near the highway. We suggest that reducing road salt applications will promote growth and pollutant accumulation by roadside vegetation.
KeywordsRoadside ecosystems Highway runoff Mitigation Road salt Metals Plant mineral composition
We thank Christopher Borne and Ieva Roznere for their field and lab assistance; and Joseph Graney, David Collins, Jonathan Schmitkons, and Jason Johnson of the Binghamton University Department of Geological Sciences for their assistance with metal analysis. Dr. Graney also provided helpful comments on the manuscript. This research was supported by a grant from the Wallace Research Foundation.
Conflicts of Interest
The authors have no conflicts of interest involved in publishing this article.
- Allen, S. E. (1989). Analysis of vegetation and other organic materials. In S. E. Allen (Ed.), Chemical analysis of ecological materials (3rd ed., pp. 46–60). Oxford, England: Blackwell Scientific Publications.Google Scholar
- Epstein, E., & Bloom, A. J. (2005). Mineral nutrition of plants: principles and perspectives (2nd ed.). Sunderland: Sinauer Associates Inc.Google Scholar
- Forman, R. T. T., Sperling, D., Bissonette, J. A., Clevenger, A. R., Cutshall, C. D., Dale, V. H., Fahrig, L., France, R., Goldman, C. R., Heanue, K., Jones, J. A., Swanson, F. J., Turrentine, T., & Winter, T. C. (2003). Road ecology: Science and solutions. Washington D.C.: Island Press.Google Scholar
- Green, I.D., Boughey, K., Diaz, A. (2014). Potentially toxic metals in historic landfill sites: implications for grazing animals. Water Air & Soil Pollution, 225 (9): article 2110.Google Scholar
- Hamilton, R. S., & Harrison, R. M. (Eds.). (1991). Highway pollution. Studies in Environmental Science 44. Amsterdam: Elsevier Science & Technology Books.Google Scholar
- Lacasse, N. L., & Rich, A. E. (1964). Maple decline in New Hampshire. Phytopathology, 54(9), 1071–1075.Google Scholar
- New York State Department of Transportation (2010). 2010 Traffic volume report. https://www.dot.ny.gov/divisions/engineering/technical-services/hds-respository/Traffic%20Volume%20Report%202010.pdf. Accessed 19 Aug 2014.
- Organisation for Economic Cooperative Development (1994). Environmental impact assessment of roads. Report prepared by an OECD scientific expert group (pp. 188). Paris: OECD.Google Scholar
- United States Climate Data. (2014). Climate Binghamton - NY. Your Weather Service Version 2.2 beta. http://www.usclimatedata.com/climate/binghamton/new-york/united-states/usny0124/2009/8. Accessed 20 June 2014
- United States Department of Transportation, Federal Highway Administration (2011). Highway statistics series: Highway statistics 2011, Table HM-12. http://www.fhwa.dot.gov/policyinformation/statistics/2011/hm12.cfm. Accessed 19 Aug 2014.