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Sulfur burial in and loss from the sediments of Little Rock Lake, Wisconsin

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Abstract:

Lake sediments often are regarded as accurate records of changes in climatic conditions, rates of atmospheric deposition of substances to the lake, or other processes occurring within lakes. In this study, the sedimentary record of sulfur was examined in Little Rock Lake, Wisconsin. This lake received experimental sulfate additions from 1985 through 1990, and a mass balance showed that 35% (425 kg) of experimental sulfur additions were buried in the sediments. Sediment cores collected before and after sulfur additions confirmed that burial of 180–360 kg of sulfur occurred during the 6 years of experimental sulfur additions. However, cores collected in 1992 and 1996 contained less sulfur than cores taken in 1990 and suggested that sulfur incorporation in sediments is not permanent. To examine seasonal sulfur loss from sediments, sulfur inventories in the top 4 cm of sediments were measured in multiple cores before and after fall overturn. At water depths greater than 5 m, surface sediments retrieved after fall overturn had significantly less sulfur than did those collected before overturn. The small seasonal release from the sediments (25 kg S in 1996) might be caused by organic matter decomposition or sulfide oxidation.

Les sédiments lacustres sont souvent considérés comme des témoins fidèles des changements dans les conditions climatiques, dans les taux de précipitation atmosphérique de substances et dans plusieurs autres processus en opération dans les lacs. Notre étude examine la présence du soufre dans les sédiments du lac Little Rock, au Wisconsin. Ce lac a reçu des apports expérimentaux de sulfates de 1985 à 1990 et un bilan massique montre que 35% (425 kg) du soufre ajouté est enfoui dans les sédiments. Une comparaison de carottes de sédiments récoltées avant et après l'ajout de soufre confirme l'enfouissement de 180–360 kg de soufre durant les 6 ans de l'expérience. Cependant, des carottes récoltées en 1992 et en 1996 contiennent moins de soufre que celles prises en 1990, ce qui laisse croire que l'incorporation du soufre dans les sédiments n'est pas permanente. Des mesures du soufre dans les 4 cm supérieurs des sédiments dans un grand nombre de carottes avant et après le brassage d'automne ont permis d'évaluer la perte saisonnière de soufre des sédiments. Aux profondeurs supérieures à 5 m, les sédiments superficiels contiennent significativement moins de soufre après le brassage d'automne qu'avant. La faible libération saisonnière de soufre par les sédiments (25 kg S en 1966) est peut-être le résultat de la décomposition de la matière organique ou de l'oxydation des sulfures.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: July 1, 2001

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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