Absorption and Translocation of Sulfur Dioxide by Seedlings of Four Forest Tree Species
1975
Jensen, K. F. | Kozlowski, T. T.
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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