Australian researchers took a look at four street trees used in South Australia to determine how will they remove pollution: Eucalyptus polyanthemos, Lophostemon confertus, Callistemon salignus, and Platanus orientalis.
Highlights from their study, “The Potential Role of Urban Forests in Removing Nutrients from Stormwater” include:
• Presence of street trees reduced nitrogen and phosphorus unplanted controls.
• Street trees in the study receiving stormwater generally grew larger.
• Differences between tree species in nutrient removal performance were not large.
• It is relatively easy to reduce phosphorus in leachate, while nitrogen is more difficult.
The Potential Role of Urban Forests in Removing Nutrients from Stormwater, Denman, E. C., VicRoads; and May, P. B. and Moore, G. M., The University of Melbourne, Journal of Environmental Quality by The American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America, Inc. (2015). doi:10.2134/jeq2015.01.0047