Die Bedeutung der Aggregierung für die Nährstoffsorption in Böden

The role of structure for nutrient sorptivity of soils The influence of the aggregation in 2 differently textured and structured soils (Haplumbrept and Chromudert) on the cation exchange capacity CEC was investigated. The results clearly demonstrated, that from the total soil (< 2 mm), natural and disturbed aggregates (Ø 5–8 mm) and the separated outer and inner part of those aggregates, the undisturbed aggregates had the lowest CEC. Furthermore, the aggregate skin was more chargeable than the inner part, due to a higher amount of silt and clay in that part. Because of higher bulk densities of the aggregates and theoretically increased tortuosity, the solution of elements in percolating water, especially in clay soils, is limited to the interaggregate pores. Thus, measured differences between the element distribution in different compartments can be explained.