Total sulfur content in the humus layer of urban polluted forest soils |
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| Authors: | R Ohtonen A M Markkola H Torvela |
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| Institution: | 1. Department of Botany, University of Oulu, Linnanmaa, 90570, Oulu, Finland
2. Department of Electrical Engineering, University of Oulu, Linnanmaa, 90570, Oulu, Finland
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| Abstract: | Total S content of the humus layer was determined from Scots pine forests in the surroundings of Oulu, an industrialized city in northern Finland. The S content nearest the city center and emission sources (zone IV; bar x=3870 μg g?1 on an organic matter basis) was about twice as high as in three background areas (80 to 170 km from the city) and about 40% higher than at the sites which were ca 20 km from the main emission sources (zone I). The estimated accumulation of S in humus layer was, on average, 0.4 to 0.6 g m?2 yr?1 in the most polluted study sites and 0.1 to 0.2, 0.2 to 0.3 and 0.4 to 0.5 g m?2 yr?1 in zones I, II, and III, respectively. |
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