Severity of SO2-lnduced Leaf Necrosis on Caribbean, Scots, and Virginia Pine Seedlings

D. M. Umbach, D. D. Davis

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Caribbean pine, an economically important tree of tropical lowlands, is at risk of SO2exposure in certain locales. Twenty-week old seedlings of Caribbean, Scots, and Virginia pine were exposed to 0.5, 1.0, and 2.0 ppm SO2(1300, 2600, and 5200 μm−3, respectively) for 1, 2, 4, and 8 h in modified controlled-environment chambers. Severity of SO2-induced leaf necrosis for each species was related to SO2concentration and exposure duration using a regression model. The three dose-response relationships differed in detail, but Caribbean pine seedlings were generally as sensitive to SO2as seedlings of the two highly sensitive temperate species. In addition, 173 4-wk-old Caribbean pine seedlings were exposed to 0.5 ppm SO2for 4 h. Over one-half of these seedlings exhibited some necrosis and over one-sixth had more than 5 percent of leaf surface necrotic. It is concluded that Caribbean pine seedlings are highly sensitive to acute doses of SO2.

Original languageEnglish (US)
Pages (from-to)1019-1021
Number of pages3
JournalJournal of the Air Pollution Control Association
Issue number9
StatePublished - Sep 1986

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • General Environmental Science
  • Pollution
  • General Earth and Planetary Sciences


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