Tree species selection on a city scale grouped by ISA Certified Arborist® (No = not a certified arborist; Yes = is a certified arborist).
| ISA Certified Arborist®1 | U | Z | r | P | ||
|---|---|---|---|---|---|---|
| No | Yes | |||||
| 10-20-302 | 4 | 6 | 197 | −4.03 | −0.51 | < 0.01 |
| Canopy cover3 | 6 | 6 | 426 | −1.88 | −0.22 | 0.06 |
| Tree list4 | 6 | 6 | 518 | −0.43 | −0.05 | 0.67 |
| Plant same5 | 4 | 2 | 781 | 2.58 | 0.31 | 0.01 |
| Species change6 | 4 | 5 | 384 | 1.77 | −0.22 | 0.08 |
| Community engagement7 | 6 | 6 | 544 | −0.38 | −0.05 | 0.70 |
| Tree inventory8 | 4 | 5 | 430 | −0.97 | −0.12 | 0.33 |
↵1Cell entries are medians from 1, “strongly disagree” to 7, “strongly agree” (8, “no opinion” coded as missing).
↵2“I strive to plant no more than 10% of a species, 20% of a genus, or 30% of a family” (n = 62; no = 38; yes = 24).
↵3“Increasing canopy cover in the city I live in is important” (n = 71; no = 46; yes = 25).
↵4‘“My city’s street tree list strongly influences what I plant” (n = 70; no = 46; yes = 24).
↵5“My city generally plants the same 3 to 5 tree species year to year” (n = 70; no = 44; yes = 26).
↵6“The tree species my city plants have changed a lot over the course of my career” (n = 67; no = 43; yes = 24).
↵7“Community engagement is a critical component of my department’s success” (n = 71; no = 46; yes = 25).
↵8“I use the tree inventory to influence the trees I select” (n = 65; no = 40; yes = 25).