The research site is a highly equipped climate change experiment for studying the separate and interactive effects of a single extreme drought (2014) and chronic (multi-year) manipulation of precipitation (drought and water addition in summer since 2015). Scientific focus: We study (a) plant diversity, (b) net primary productivity, (c) fine-scale plant species assembly, (d) litter decomposition, (e) soil arthropod diversity, (f) nematode diversity, (g) fungal diversity, (h) plant root biomass and activity, (i) organic carbon storage, and soil respiration.