Sulfur cycling in forests |
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Authors: | D. W. Johnson |
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Affiliation: | (1) Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA |
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Abstract: | Sulfur is essential for the production of certain amino acids in plants. As amino acid sulfur is the major form of sulfur in trees, there is a strong relationship between organic S and organic N in tree tissue. Sulfur deficiencies occur in parts of southeastern Australia and northwestern North America, remote from pollutant inputs. Since bilogical S requirements of forests are modest (< 5 kg · ha–1 yr–1 for net vegetative increment), however, atmospheric S inputs in polluted regions (10–80 kg · ha–1 yr–1 ) often exceed not only the forest ecosystem S requirement but also its ability to biologically accumulate S. There is some increase in the SO2–4–S content of forest vegetation in response to elevated atmospheric S inputs, but this capacity is apparently easily saturated. Soil SO2–24adsorption is often the dominant feature of S cycling in polluted ecosystems and often accounts for net ecosytem S accumulations.Contribution from a symposium on the role of sulfur in ecosystem processes held August 10, 1983, at the annual meeting of the A.I.B.S., Grand Forks, ND; Myron Mitchell, convenor. |
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Keywords: | Sulfur sulfate deposition uptake soil adsorption leaching |
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