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Tables
- Table 1.
Ozone 12-hour treatment meansz, SUM0y, SUM06x, and the number of hours above 120 ppb.
Treatment Subambient (CF) Ambient (NF) 2.0X ambient (2.0X) 12-hour mean (ppb) 26.9 ± 7 41.7 ± 6 92.5 ± 15 SUM0 (ppm-h) 4.0 ± 2 5.6 ± 2 10.4 ± 3 SUM06 (ppm-h) 0 1.1 ± 1 8.1 ± 5 No. hr > 120 ppb 0 0 28.7+ 12 - Table 2.
Percentage of the leaves injured (PLI) and Horsfall-Barratt (H-B) rating for foliar injury for 6 red maple cultivars exposed to 4 acute levels of ozone.
Cultivar PLIz H-B rating Autumn Blazey 1.9abx 1.5b Autumn Flame 0.3b 1.1c Fairview Flame 3.4a 1.6ab Franksred (Red Sunset™) 1.8ab 1.4b Northfire 4.0a 1.8a October Glory 2.9a 1.6ab Ozone Concentration (ppb) 0w 0.0 1.0 100 0.9 1.3 200 2.5 1.6 300 6.2 2.1 Significancev L*** Q** ↵z Cv. X O3 not significant; hence, only main effects are reported. PLI and H-B rating data were transformed using an arc-sin transformation before analysis. Retransformed mean values are presented. H-B ratings: 1 = 0%, 2 = 1% to 3%, 3 = 3% to 6% of the leaf area injured.
↵y PLI and H-B rating are across ozone concentrations.
↵x Mean separation within rows by Duncan’s multiple range test, P = 0.05.
↵w PLI and H-B rating are across cultivars.
↵v Linear or quadratic response significant at the 1 % (**) or 0.1 %(***) level.
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