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Absorption and Translocation of Sulfur Dioxide by Seedlings of Four Forest Tree Species¹

ABSTRACT

Rates of absorption of SO₂ and of translocation of absorbed sulfur were determined in sugar maple (Acer saccharum Marsh.), bigtooth aspen (Populus grandidentata Michx.), white ash (Fraxinus americana L.), and yellow birch seedlings [Betula alleghaniensis Britton (Betula lutea Michx. f.)]. Bigtooth aspen, a sensitive species, had the highest absorption rate with no prefumigation and sugar maple, a tolerant species, had the lowest. After 20 hours or more of prefumigation with 1,965 µg/m³ (0.75 ppm) SO₂, the rate of sulfur absorption was reduced in all species except white ash, a species intermediate in sensitivity. The relationship between species sensitivity and absorption rate thus changed with the prefumigation treatment. The foliar sulfur content of all species increased with SO₂ fumigation. Sulfur-35 absorbed from the atmosphere as ³⁵SO₂ was concentrated mainly in the leaves shortly after fumigation, but by the eighth day had been translocated throughout the plants. Amounts of sulfur translocated to roots varied with species.

Key Words: air pollution • sugar maple • bigtooth aspen • white ash • yellow birch • ³⁵SO₂

¹ Research supported by the College of Agricultural and Life Sciences, University of Wisconsin, Madison, WI 53706.

² Plant Physiologist, U. S. Department of Agriculture, Forest Service, Northeastern Forest Exp. Sta., Forest Insect & Disease Lab., Delaware, OH 43015; and A. J. Riker, Professor, Department of Forestry, Univ. of Wis., respectively.

Received for publication December 9, 1974.