Article Figures & Data
Figures
- Figure 1.
Distribution of tree numbers among species by dbh class.
- Figure 2.
Distribution of average annual per-tree benefits (top) and costs (bottom) among species by dbh class.
- Figure 3.
Distribution of benefit-cost ratios (BCR) among species by dbh class.
Tables
- Table 1.
Tree numbers, locations, and average annual number of visits and hours spent performing tree work.
Species No. trees Front yard % Parkway % Cutout % Visits/yr Hours/yr Hackberry 4,454 87.0 12.3 0.7 1,233 1,266 Camphor 1,276 74.5 20.8 4.6 207 127 Modesto ash 8,024 95.6 3.6 0.9 1,965 3,405 Ginkgo 3,462 59.7 9.3 31.1 515 400 Sweetgum 2,892 90.9 2.6 6.5 928 1,366 Southern magnolia 928 33.8 6.0 60.2 218 165 Pistache 10,199 72.5 16.9 10.6 2,946 2,464 Plane 2,038 25.6 55.5 18.8 272 136 Pear* 7,265 81.4 5.6 13.0 1,850 1,323 Zelkova 5,190 91.5 7.7 0.8 1,152 954 Totals 45,728 11,286 11,606 ↵*56% Bradford, 28% Aristocrat, 9% Capital, 7% other.
Energy Air quality CO2 Stormwater Aesthetics Total Hackberry 118.30 19.82 7.05 8.23 27.69 181.09 Camphor 54.29 7.62 2.85 6.71 11.29 82.75 Modesto ash 97.83 52.61 7.67 11.19 5.67 174.96 Ginkgo 51.51 2.79 5.43 3.27 35.18 98.18 Sweetgum 79.88 10.16 6.29 5.24 31.38 132.95 Southern magnolia 79.44 2.42 2.81 2.79 6.15 93.61 Pistache 65.31 10.27 2.82 3.34 11.03 92.76 Plane 136.76 25.76 4.80 7.59 11.33 186.24 Pear 34.00 2.98 1.95 1.47 14.19 54.59 Zelkova 89.25 8.26 4.69 3.37 18.47 124.05 Prune Remove Plant Root-related Storm/liability IPM/other Total Hackberry 29.30 1.43 0.01 0.88 0.76 0.29 32.67 Camphor 8.34 1.78 1.05 0.14 — 0.09 11.40 Modesto ash 45.22 0.83 0.01 1.43 0.37 0.93 48.80 Ginkgo 6.56 3.42 2.18 0.75 0.24 0.14 13.28 Sweetgum 49.70 0.90 0.03 2.14 0.62 0.92 54.31 Southern magnolia 17.38 1.13 0.03 0.95 0.70 0.19 20.38 Pistache 25.06 1.54 0.39 0.44 0.19 0.16 27.78 Plane 6.14 0.59 0.51 0.27 0.02 0.13 7.66 Pear 18.55 1.27 0.20 0.53 0.26 0.12 20.94 Zelkova 16.01 2.60 0.78 1.09 0.42 0.24 21.14 - Table 4.
Average annual pruning costs and their distribution by type (GP < 20 is general pruning of trees < 20 cm dbh, where GP includes crown cleaning, thinning, and reduction).
% visited $/visit $/tree % of total pruning expenditure Train Raise Other GP < 20 GP 20-46 GP > 46 Hackberry 23.8 123 29 0.1 7.1 7.7 6.6 50.0 28.5 Camphor 11.4 73 8 2.5 16.6 10.1 21.3 40.7 8.9 Modesto ash 20.0 226 45 0.0 0.6 9.2 0.1 0.2 89.9 Ginkgo 8.5 77 7 1.3 21.6 27.7 21.8 27.4 0.2 Sweetgum 25.1 198 50 0.0 2.1 15.8 2.2 45.8 34.1 Southern magnolia 20.0 87 17 0.1 25.6 24.5 12.7 37.1 0.0 Pistache 24.7 102 25 0.4 8.0 18.8 13.3 59.4 0.0 Plane 9.8 63 6 1.0 11.2 11.3 29.8 21.1 25.6 Pear 21.2 88 19 0.7 6.9 14.8 27.4 50.2 0.0 Zelkova 15.3 104 16 0.4 10.3 9.6 29.2 48.8 1.6 Species Benefit Cost Net benefit B/C Plane 186.24 7.66 178.57 24.3 Ginkgo 98.18 13.28 84.90 7.4 Camphor 82.75 11.40 71.36 7.3 Zelkova 124.05 21.14 102.91 5.9 Hackberry 181.09 32.67 148.42 5.5 Southern magnolia 93.61 20.38 73.23 4.6 Modesto ash 174.96 48.80 126.16 3.6 Pistache 92.76 27.78 64.98 3.3 Pear 54.59 20.94 33.65 2.6 Sweetgum 32.95 54.31 78.64 2.4
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