KISKUN LTER was established in 1995, together with the Hungarian LTER Network. Its study area is the Kiskunság Sand Ridge and its periphery, 14000 km2 altogether, 17% of the area of Hungary. The primarily sandy area is extremely heterogeneous. It consists of arable lands, planted forests, meadows, abandoned fields, settlements, alkaline lakes, wetlands, and species rich remnants of forest steppe. It is also very varying in time: ploughing and setting aside, extensive plantation of alien trees, drainage, wild fires, biological invasions, and fast demographic movements have been happening in the last 100 years, and beyond all those, the area is particularly sensitive to the climate change.