The aim of this competence field is the operation of terrestrial observation platforms for the continuous observation of the various terrestrial subsystems (i.e. atmosphere, hydrosphere, pedosphere, biosphere). The long-term data is used for improving our understanding of the complex influences of climate change and land use change on terrestrial ecosystems. An important aspect is also the combination of the long-term observation platforms with dedicated larger scale experiments and integrated modelling to move forward our understanding of the functioning of terrestrial systems and the complex interactions and feedback mechanisms between its different compartments.