Temporal Variability of Cadmium in a Mollic Fluvisol of the Elbe River

摘要

High Cd concentrations have been proven in soil solution at three depths in a Mollic Fluvisol at the Elbe River. Cd concentration in soil solution especially at 25 and 60 cm soil depth, and partly in 100 cm soil depth and groundwater exceeded the critical limits of 5 μg l~(-1) set by the German Soil Conservation Law (Fig. 1). Cadmium can be mobilized which is consequently a potential risk for the environment. Factors controlling the dynamics of Cd in soil solution and groundwater are altering with different soil conditions. DOC and pH-value are the most important factors controlling the temporal variability of Cd. DOC and pH-value including the "hydro-thermal milieu" (Temp+Moi) explain 77% of the temporal variability of Cd in soil solution and groundwater given by field measurements in a Mollic Fluvisol at the Elbe River. The mobilization of Cd and other heavy metals is influenced by many factors. This case study has shown the combinations of controlling factors enhance the stability index of the temporal variability of Cadmium.