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Water, Air, and Soil Pollution

, Volume 113, Issue 1–4, pp 141–154 | Cite as

Mercury and Methylmercury in Upland and Wetland Acid Forest Soils of a Watershed in NE-Bavaria, Germany

  • D. Schwesig
  • G. Ilgen
  • E. Matzner
Article

Abstract

Mercury (Hg) and methylmercury (CH3Hg+) are global pollutants, but little information is available on their distribution and mobility in soils and catchments of Central Europe. The objective of this study was to investigate the pools and mobility of Hg and CH3Hg+ in different forest soils. Upland and wetland forest soils, soil solutions and runoff were sampled. In upland soils the highest contents of total-Hg were found in the Oh layer of the forest floor (>400 ng g-1) and the storage of non geogenic total-Hg (calculated for 60 cm depth) was about 120 mg/m2. The storage of total-Hg was one order of magnitude lower in wetland soils as compared to the upland soils. By far the largest proportion of total-Hg in soils was bound in immobile fractions. The depth gradients of CH3Hg+ did not correspond to those of total-Hg and the highest contents of CH3Hg+ in upland soils were observed in the litter layer of the forest floor and in the Bsv horizon. The CH3Hg+ content of the wetland soils was generally much higher in comparison with upland soils. CH3Hg+ in solution was found in the forest floor percolates of upland soils and in wetland soils, but not in soil solutions from mineral soil horizons. Gaseous losses of Hg as well as methylation of Hg are likely in wetland soils. The latter might be highly relevant for CH3Hg+ levels in runoff.

forest soils mercury methylmercury runoff soil solution wetland 

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Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • D. Schwesig
    • 1
  • G. Ilgen
    • 1
  • E. Matzner
    • 1
  1. 1.>Bayreuth Institute of Terrestrial Ecosystem Research (BITOEK)University of BayreuthBayreuthGermany

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