Arboriculture & Urban Forestry 47(5): September 2021 Table 3. Statewide relative abundance percentages (weighted) for street tree species and genera in New York State. Species Acer platanoides (Norway maple) Gleditsia triacanthos (honeylocust) Pyrus calleryana (Callery pear) Acer rubrum (red maple) Acer saccharum (sugar maple) Acer saccharinum (silver maple) Malus spp. (crabapple) Tilia cordata (littleleaf linden) Platanus × acerifolia (London planetree) Quercus palustris (pin oak) Genus Acer (maple) Quercus (oak) Pyrus (pear) Gleditsia (honeylocust) Tilia (linden) Prunus (cherry) Picea (spruce) Malus (apple) Platanus (planetree) Fraxinus (ash) 2020 17.64 5.71 5.65 5.01 4.79 4.39 3.60 3.18 2.98 2.72 35.35 7.22 5.74 5.68 4.36 4.22 3.75 3.61 3.29 2.70 2017 19.80 5.03 5.63 5.23 8.47 4.94 2.28 2.61 6.09 3.87 40.91 8.44 6.36 4.76 4.09 3.09 2.70 2.26 6.30 3.29 2014 20.65 5.21 4.72 5.29 9.89 5.79 2.45 2.69 5.72 2.77 44.14 7.03 5.36 4.96 4.09 2.84 2.99 2.47 5.79 3.35 203 ∆ −3.01 0.50 0.94 −0.29 −5.10 −1.40 1.16 0.49 −2.74 −0.05 −8.78 0.20 0.38 0.72 0.27 1.38 0.76 1.13 −2.50 −0.66 to 52.57% of all street trees in the 2014 assessment, and the 6 most prevalent street tree genera statewide accounted for 62.58% of all street trees in this assess- ment as compared to 71.37% of all street trees in the 2014 assessment. Consistent with these results are results for the 32 municipalities with inventories conducted at multiple points in time (Table 4). In these municipalities, for both the newer and older inventories, Norway maple was found to be the most prevalent street tree species, and maple was found to be the most prevalent street tree genus. Additionally, between the newer and older inventories, the mean percentage of Norway maple declined from 21.97% to 17.10% (a 22.14% reduc- tion), and the mean percentage of maple declined from 47.54% to 35.86% (a 24.57% reduction). Other street tree species exhibiting declines in these munic- ipalities include sugar maple, silver maple, and green ash (Fraxinus pennsylvanica), and other street tree genera exhibiting declines include planetree and ash. Conversely, street tree species exhibiting increases include honeylocust, Callery pear, crabapple, and northern red oak (Quercus rubra), and street tree gen- era exhibiting increases include oak, cherry, spruce (Picea spp.), and pear. The 6 most prevalent street tree species accounted for 55.83% of all street trees in the newer inventories and 67.59% in the older inven- tories (a 17.40% reduction). The 6 most prevalent street tree genera accounted for 72.49% of all street trees in the newer inventories and 80.87% in the older inventories (a 10.36% reduction). Despite less prevalence found for Norway maple and maple in the 75 inventories comprising this state- wide assessment as compared to the 2014 statewide assessment, the weighted statewide percentage of Norway maple for the 75 inventories exceeded Santa- mour’s 10% rule for species, and the weighted state- wide percentage of maple exceeded his 20% rule for genus. Of the 75 inventories, 73 (97.33%) exceeded the 10% rule for species, and 72 (96.00%) exceeded the 20% rule for genus. In nearly all cases, this was attrib- utable to the abundance of Norway maple and maple. However, in a few cases, honeylocust and sugar maple exceeded 10% of all street tree species, and honeylo- cust, oak, and planetree exceeded 20% of all street tree genera. Similarly, for the 32 municipalities with inventories conducted at multiple points in time, despite reductions found for the prevalence of Norway ©2021 International Society of Arboriculture
September 2021
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