Site Assessment Tool Field Tested In Eight Cities

Source: Bryant C. Scharenbroch, David Carter, Margaret Bialecki, Robert Fahey, LukeScheberl, Michelle Catania, Lara A.Roman, Nina Bassuk, Richard W.Harper, Les Werner, Alan Siewert, Stephanie Miller, Lucy Hutyra, Steve Raciti, “A rapid urban site index for assessing the quality of street tree planting sites,” Urban Forestry & Urban Greening

Stevens Point, WI (September 6, 2017) – Urban trees experience site-induced stress and this leads to reduced growth and health. To help urban forest managers to better match species tolerances and site qualities, a rapid assessment tool has been developed and field tested.

A site assessment tool can be useful to urban forest managers to improve the matching of species tolerances to site qualities, and to assess the efficacy of soil management actions.

 

Toward this goal, a rapid urban site index (RUSI) model was created and tested for its ability to predict urban tree performance.

The RUSI model is a field-based assessment tool that scores 15 parameters in approximately five minutes. This research was conducted in eight cities throughout the Midwest and Northeast USA to test the efficacy of the RUSI model.

The RUSI model accurately predicted urban tree health and growth metrics (P < 0.0001; R2 0.18–0.40). While the RUSI model did not accurately predict mean diameter growth, it was significantly correlated with recent diameter growth. Certain parameters in the RUSI model, such as estimated rooting area, soil structure and aggregate stability appeared to be more important than other parameters, such as growing degree days.

Minimal improvements in the RUSI model were achieved by adding soil laboratory analyses. Field assessments in the RUSI model were significantly correlated with similar laboratory analyses. Other users may be able to use the RUSI model to assess urban tree planting sites (<5 min per site and no laboratory analyses fee), but training will be required to accurately utilize the model.

Future work on the RUSI model will include developing training modules and testing across a wider geographic area with more urban tree species and urban sites.

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