Biogeochemical exposure pathways in soil-water systems

The biogeochemical mass budget of various macro- and microelements for this catchment is shown in Table 4. 

The possible explanation of these results is related to the construction of dikes in this area a few years prior to the experiment. This changed the biogeochemical cycles of many nutrients in natural ecosystems too. Furthermore, the input of nutrients with flooded waters was not taken into account. 

As a result of microbial formation of metal-organic complexes with fulvic acids in soils of Tropical Rain Forest ecosystems, the surface and sub-surface runoff waters are enriched in some heavy metals like manganese and copper. A similar tendency has been shown for boron, strontium and fluorine. 

---