Landscape-scale patterns of sediment sulfur accumulation in Swedish lakes |
| |
Authors: | Richard Bindler Maria Wik-Persson Ingemar Renberg |
| |
Institution: | 1. Department of Ecology and Environmental Science, Ume? University, SE-901 87, Umea, Sweden 2. Environmental Department R?nnsk?r, Boliden Mineral AB, SE-932 81, Skelleftehamn, Sweden
|
| |
Abstract: | Sulfur has played a central role in the acidification of many lakes in Scandinavia and other regions. As part of the research
into sulfur cycling, numerous studies have analyzed the sediment record in order to develop insights into past in-lake cycling
of sulfur, particularly in the context of reconstructing past deposition rates. Although many of these studies have shown
that it is not easy to interpret the sediment record in terms of past sulfur deposition rates, analyses of sulfur in sediment
still provide valuable information on the response of lakes to anthropogenic sulfur deposition. Here, we have analyzed sulfur
in top and bottom samples from short surface cores (25–35 cm, representing ≥250 years) as well as bulk cores from ∼110 lakes
located throughout Sweden, which were collected during 1986, as well as in more-detailed profiles from six lakes. The lakes
with the highest surface sediment concentrations (9–24 mg S g−1 dry mass) and the highest calculated inventories of ‘excess’ sulfur (20–180 g S m−2) are found in southern Sweden and around one industrial area along the northeastern coast where sulfur deposition rates and
lake-water concentrations have been highest. For many lakes in the central and northern inland region it is common that the
sediment cores exhibit either no enrichment or even a decline in sulfur concentrations in near-surface sediments, which we
suggest was the pre-pollution norm for lakes. Although interpreting sulfur sediment profiles is problematic for reconstructing
deposition, a more-comprehensive spatial sampling approach shows that there is a good geographic agreement between sulfur
deposition, lake-water chemistry and sediment sulfur accumulation. |
| |
Keywords: | Sulfur Acid deposition Sweden Lake sediments |
本文献已被 SpringerLink 等数据库收录! |
|