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Emission of Hydrogen Sulfide from Sulfur Dioxide-Fumigated Pine Trees ¹

Department of Plant Physiology, University of Umeå, S-901 87 Umeå, Sweden, Department of Analytical Chemistry, University of Umeå, S-901 87 Umeå, Sweden

Pine (Pinus silvestris L.) trees subjected to relatively low concentration of SO₂ in the field emit H₂S from the needles, as demonstrated by gas chromatographic analysis after preconcentration on a molecular sieve. H₂S is the only reduced sulfurous compound emitted from SO₂ fumigated leaves. The emission is light and SO₂ concentration dependent. Pine trees in the field and in laboratory experiments continue to emit H₂S several hours after the termination of prolonged SO₂ fumigation. The maximum emission rates observed from pine trees in the field and in laboratory experiments, 14 and 20 nanomoles per milligram chlorophyll per hour respectively, are about the activity expected for the sulfur assimilation pathway in the chloroplasts.