Arboriculture & Urban Forestry 46(5): September 2020 Respondents were asked to rank tree species selec- tion criteria on a scale of 1 “Not at all important” to 5 “Very important” (Petter et al. 2020). They were also asked to select their top 3 most important criteria out of the same list and rank them in order of importance. A Borda count was then used to calculate which crite- ria were ranked the highest (Van Erp and Schomaker 2000). Three points were assigned for a ranking of one, two for a ranking of two, and one for a ranking of three (i.e., 1 = 3, 2 = 2, 3 = 1) to provide a hierarchy of their overall rankings (Van Erp and Schomaker 2000). These were compared to each other, as well as open-ended responses, to illicit greater detail regard- ing how managers prioritize tree species selection. RESULTS Respondents had a mean experience level of 15.5 years. The group was generally experienced, how- ever, there was a wide range of experience, from 1 to 53 years. The first quartile occurred at 6 years, the second at 13.5 years, and the third at 22.5 years. Over- all there were generally small numbers of trees planted by municipalities. The mean number of trees planted by municipalities was between 41 to 60 trees per year, while the median range was 11 to 20 trees per year. The first quartile occurred at 0 to 10 trees, the second at 11 to 20 trees, and the third at 51 to 60 trees. Five respon- dents reported planting five hundred or more trees. Twenty respondents (29%) reported having a tree planting budget of $1000 or less (Table 1). Only 5 municipalities reported having a tree planting budget over $50,000. Of those municipalities reporting bud- gets over $50,000, one reported having a budget between $70,001 and $80,000. The other 4 reported having a budget greater than $90,000. Of the respondents, 54.4% reported that a particu- lar tree species was unavailable at a nursery 5% of the time or less. Our results showed that 11.8% of respon- dents indicated that a tree species is unavailable at a nursery 31% of the time or greater (Figure 1). Most respondents reported using under 5 nurseries to source their tree species. Over 50% of respondents sourced their trees from 1 to 3 nurseries. One respondent indi- cated that they source trees from twelve different nurs- eries (Table 2). In 2016, managers across the PNW reported 236 different species (or cultivars), 49 genera, and 23 families among their top 5 most commonly planted tree species. This was a drastic increase to the top 5 Figure 1. Respondents were asked to report the percent of times they were unable to locate a desired tree species at a nursery. ©2020 International Society of Arboriculture 375 Table 1. Tree planting budgets of municipalities. Budget in $ 0-1000 Frequency 20 1001-2000 2001-3000 3001-4000 4001-5000 5001-6000 6001-7000 7001-8000 8001-9000 9001-10,000 10,001-20,000 20,001-30,000 30,001-40,000 40,001-50,000 50,001-60,000 60,001-70,000 70,001-80,000 80,001-90,000 90,000 or more 8 7 2 9 3 2 1 1 1 6 2 1 1 0 0 1 0 4 Percent 29.0 11.6 10.1 2.9 13.0 4.3 2.9 1.4 1.4 1.4 8.7 2.9 1.4 1.4 0.0 0.0 1.4 0.0 5.8 Table 2. Number of tree nurseries used to source trees. Number of nurseries 1 Frequency 8 2 3 4 5 6 7 10 12 16 16 8 15 2 1 1 1 23.5 23.5 11.8 22.1 2.9 1.5 1.5 1.5 Percent 11.8
September 2020
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