Which mechanism primarily dictates the conductivity differences in freshwater lake sediments?

💡 Explanation

When organic matter decomposes in sediment, redox gradients are established causing changes in mineral solubility and, thus, ionic concentrations within pore water because decomposition introduces reactive substances. Therefore, differences conductivity arise from organic matter decay, rather than tectonic movements, thermal gradients, or diffuse source contaminations which each act by different means.

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