Soil fauna diversity is classified into different functional groups and fills various positions in soil food webs. The aim of our lab and field experiments is to identify and analyze ecologically important processes, which are controlled by soil fauna activity. Our results serve as basis for assessing ecological services by soil fauna in terms of sustainable soil management. Furthermore, we go for the identification of structural shifts within the soil fauna diversity under future environmental changes and land use systems. Our aim is to reveal possibilities, which soil fauna might have to adapt to future conditions.