Arboriculture & Urban Forestry 47(5): September 2021 Species N inventories N species N trees Inverse SDI Shannon-Weiner_H Evenness eH Genus N inventories N genera N trees Inverse SDI Shannon-Weiner_H Evenness eH Table 5. Diversity statistics for street tree species and genera. Statewide 2017 154 2020 75 89 14,376 12.36 3.03 0.28 22.93 75 45 14,376 5.54 2.26 0.24 10.54 57 6,933 8.78 2.67 0.32 15.85 164 32 6,603 4.08 1.91 0.25 7.49 205 Multiple inventories 2014 132 57 7,735 8.65 2.66 0.31 15.58 142 32 7,291 4.04 1.89 0.25 7.40 Newer 32 98 27,949 13.95 3.17 0.29 25.62 32 98 27,949 6.68 2.41 0.26 11.98 Older 32 79 25,880 9.02 2.74 0.24 17.11 32 41 25,880 4.43 2.00 0.21 8.24 Inverse SDI at the species level were found to be cor- related more with evenness than with the number of species and genera (Pearson’s R, P < 0.05)(Table 6). For the 32 municipalities with multiple inventories, evenness values (Buzas and Gibson 1969) were found to have increased for the species and genus distribu- tions between the newer and older inventories (Table 5). In addition, for the newer inventories, the Inverse SDI at the species level and Inverse SDI and Shannon- Wiener Diversity Index at the genus level were found to be correlated more with evenness than with the number of species and genera, and the Shannon-Wiener Diversity Index at the species level and effective diver- sity at both the species and genus levels were found to be correlated more with the number of species and genera than with evenness (Pearson’s R, P < 0.05)(Table 6). Finally, diversity statistics were correlated with relative abundance percentages for prevalent street tree species and genera. At the species level, for the 75 inventories comprising the statewide assessment, and for the newer inventories from the 32 municipal- ities with multiple inventories, the percentages of Norway maple were found to be negatively correlated with the Inverse SDI, the Shannon-Wiener Diversity Index, effective diversity, and evenness (Pearson’s R, P < 0.05)(Table 7). Conversely, for the 75 inventories comprising the statewide assessment, the percentages of London planetree and pin oak (Quercus palustris) at the species level were found to be positively cor- related with the Inverse SDI, effective diversity, and evenness; for the newer inventories from the 32 municipalities with multiple inventories, the percent- age of London planetree was found to be positively correlated with the Inverse SDI, effective diversity, and evenness, and the percentage of Japanese tree lilac (Syringa reticulata) was found to be positively correlated with the Inverse SDI, the Shannon-Wiener Diversity Index, effective diversity, and evenness. At the genus level, for the 75 inventories comprising the statewide assessment, and for the newer inventories from the 32 municipalities with multiple inventories, the percentages of maple were found to be negatively correlated with the Inverse SDI, the Shannon-Wiener Diversity Index, effective diversity, and evenness (Pearson’s R, P < 0.05)(Table 7). Conversely, for the 75 inventories comprising the statewide assessment, and for the newer inventories from the 32 municipal- ities with multiple inventories, the percentages of oak and cherry were found to be positively correlated with the Inverse SDI, the Shannon-Wiener Diversity Index, effective diversity, and evenness. DISCUSSION Statewide relative abundance percentages between this statewide assessment and the 2014 statewide assessment (Cowett and Bassuk 2014) indicate fewer ©2021 International Society of Arboriculture
September 2021
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