Growth response of green and white ash seedlings to ozone, sulfur dioxide, and simulated acid rain. [Fraxinus pennsylvanica Marsh]

Journal Article · Thu Dec 01 04:00:00 EST 1988 · Forest Science; (USA)

OSTI ID:7098479

Chappelka, A H; Chevone, B I; Burk, T E ^[1]

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1. Auburn Univ., AL (USA)

Nine-week-old green (Fraxinus pennsylvanica Marsh.) and white (F. americana L.) ash were exposed to O{sub 3} and/or SO{sub 2} (control, 0.10 ppm O{sub 3}, 0.08 ppm SO{sub 2}, or 0.10 ppm O{sub 3} + 0.08 ppm SO{sub 2}) for 4 h d{sup {minus}1}, 5 d wk{sup {minus}1} in combination with simulated rain (pH 3.0, 4.3 or 5.6, 1 h d{sup {minus}1}, 2 d wk{sup {minus}1} at 0.75 cm h{sup {minus}1}) for 6 weeks, under controlled laboratory conditions, with rain applied either just before or after fumigation. Across all rain treatments, white ash biomass was suppressed by the application of O{sub 3} and cumulative shoot elongation of green ash exposed to O{sub 3} and/or SO{sub 2} was less than controls. The combination of O{sub 3} + SO{sub 2} did not affect the growth of either species more than the pollutants applied alone. Leaf area ratio (LAR) and root to shoot ratio (RSR) exhibited quadratic responses to rain pH in green ash, across all pollutant treatments. Significant pollutant {times} pH interactions occurred in leaf weight ratio (LWR) in green ash and LAR and RSR in white ash. Significant linear increases in LAR and decreases in RSR, with decreasing pH, were observed for O{sub 3} and SO{sub 2}-treated white ash. These findings are discussed relative to implications of the effects of gaseous pollutants in combination with acid rain on green and white ash growth.

• OSTI ID: 7098479
• Journal Information: Forest Science; (USA), Journal Name: Forest Science; (USA) Vol. 34:4; ISSN FOSCA; ISSN 0015-749X
• Country of Publication: United States
• Language: English

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63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
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OXYGEN COMPOUNDS
OZONE
PLANT GROWTH
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SIMULATION
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TOXICITY
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