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Tables
- Table 1.
Sampling distribution summary data: average age since planting and average tree lawn widths by genus for four tree genera planted in Cincinnati, Ohio, since 1980.
Genus Average observed Time since planting (yrs) Tree lawn width, m (ft) Gleditsia 176 11 1.6 (5.3) Koelreuteria 93 11 1.4 (4.6) Quercus 181 10 2.3 (7.4) Zelkova 161 9 2.1 (6.8) Totals 611 — — Mean 153 10.1 2.0 (6.5) Median — 9.0 1.9 (6.2) Std. dev. — 3.6 0.5 (1.8) - Table 2.
Presence and absence of roots under sidewalks with cracked and intact sidewalk blocks by genera and across genera.
Genus Chi-square* Sample size for genera Root presence under sidewalk Number observed Intact blocks Cracked blocks Gleditsia 16.4 176 No 54 46.3% 53.7% Yes 122 17.2% 82.8% Koelreuteria 4.3 93 No 64 39.1% 60.9% Yes 29 17.2% 82.8% Quercus 7.7 181 No 139 41.7% 58.3% Yes 42 19.1% 81.0% Zelkova 7.9 161 No 94 30.9% 69.2% Yes 67 11.9% 88.1% All genera 37.4 611 No 351 39.0% 61.0% Yes 260 16.2% 83.9% ↵*Chi-square values, significance levels, and sample sizes are valid for each genus. All probability levels using the Fisher Exact Test two-sided P values are significant at the 0.01 levels or better except for Koelreuteria, which was significant at the 0.05 levels.
- Table 3.
Oxygen concentrations as partial pressure (kPa) for sample tubes in cracked and intact sidewalk blocks and adjacent areas at two depths (two-year average). Depth, crack, site, and depth × site interaction effects are significant at the 0.01 level or greater.
Depth (cm) Crack Sample site Tree lawn Sidewalk Park 15 Yes 17.4 17.4 18.1 15 No 16.7 15.6 18.3 30 Yes 16.6 17.3 17.8 30 No 13.8 16.1 16.3
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