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This article in JEQ

  1. Vol. 4 No. 3, p. 379-382
    Received: Dec 9, 1974



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

  1. K. F. Jensen and
  2. T. T. Kozlowski2



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.

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