Influence of Storm "Kyrill" Induced Deforestation on the Silicon Supply of the Sorpe Dam (original) (raw)

Abstract

The storm "Kyrill" in 2007 fell an huge amount of timber in North Rhine-Westphalia, Germany and produced areas with uncovered soil. It is assumed that bare soil leads to an increased leaching of minerals, which could influence the Si concentration in the receiving waters. We were able to proove this by finding a slight positive correlation between the relative area of Kyrill clearances and the Si content of the draining streams on several forest covered areas on the western shore of the Sorpe dam. In catchment areas with 44 % Kyrill clearances the Si content of the draining streams increased about 1.1 mg/L (SiO2), that is about 0.25 mg/L (SiO2) for each 10 % of deforestation. This additional silicon load could possibly have a positive effect on the diatom development in the dam.

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