Article Figures & Data
Figures
- Figure 1.
A. and B. Field shots of Gleditsia triacanthos inermis ‘Majestic’ (O3 resistant). Compare with C. and D. Field shots of ‘Imperial’ (O3 sensitive). Note upper leaf surface stipple and leaf drop on ‘Imperial.’ A. and C. were taken on August 17,1983 and B. and D. on September 14, 1983.
- Figure 2.
The relationship between ozone tolerance and gas exchange rates of 5 honeylocust (Gleditsia triacanthos inermis) cultivars on 2 representative sampling dates in 1983. Each point on the graph represents the mean of 16 readings per cultivar. The 5 cultivars used and the ozone injury score for each cultivar are as follows: ‘Shademaster’ = 5, ‘Skyline’ = 4, ‘Majestic’ = 0, ‘Imperial’ = 18, and ‘Sunburst’ = 2.
Tables
- Table 1 The number of hours that the ozone concentration in New Brunswick exceeded 0.12 ppm and the highest 1-hour ozone levels recorded during the growing season, 1981-1983.
Month 1981 1982 1983 No. hours 0.12 ppm Highest conc. (ppm) No. hours 0.12 ppm Highest conc. (ppm) No. hours 0.12 ppm Highest conc. (ppm) June 4 .138 5 .168 29 .177 July 1 .131 18 .160 12 .151 August 1 .122 2 .143 30 .197 - Table 2 The ozone injury scores of 5 honeylocust cultivars determined in the field and the mean diameter growth increment for 1981-1983.
Cultivar Ozone injury score Diameter increase (cm) 1981 1982 1983 Shademaster 4 4 5 1.06 Skyline 0 2 4 1.14 Majestic 4 0 0 1.25 Imperial 12 20 18 0.90 Sunburst 0 2 2 1.01
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