Stem and Foliage Elongation of Young Loblolly Pine as Affected by Ozone
Abstract:The rate, timing, and pattern of shoot and foliage elongation on the main stem of 3-year-old loblolly pine exposed to two levels of ozone were examined in the Piedmont of North Carolina. Shoot growth rates were generally greater in plots which received charcoal-filtered air (CF) than in plots which were exposed to ozone at three times ambient levels (3X). The pattern and duration of height growth were unaffected by ozone. Main stem elongation occurred continuously from late March to September and was 90% complete by mid-August in both treatments. Foliage elongated continuously from early April to early November. First and second flush foliage elongation rates were significantly greater in CF plots. Foliage elongation rates for subsequent flushes were similar for the two treatments. Except for the fifth flush, the number of fascicles produced was consistently greater in CF plots. As with shoot growth, the pattern and duration of foliage elongation on the main stem did not appear to be affected by ozone. For. Sci. 38(2):324-335.
Document Type: Journal Article
Affiliations: Plant Pathologist, USDA Forest Service, Research Triangle Park, NC
Publication date: 1992-04-01
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