Embedded into the TERENO project, IMK-IFU has installed 3 lysimeter networks with a total of 36 undisturbed intact grassland soil cores (diameter 1m, depth 1.5m) at three grassland sites differing in altitude (860m, 770m, 600m), in South-Bavaria, Germany. Lysimeters were partly translocated from higher elevation to lower elevation and other soil cores stay at original sites as controls. With decreasing altitude, mean annual temperature increases (up to 2.5°C) and mean annual precipitation slightly decreases. In addition to the space for time in-situ climate change approach the total of 36 lysimeters are split into treatments of intensive and extensive grassland management. Soil greenhouse gas exchange (N2O, CH4, CO2) exchange are measured mainly by a new developed automatic chamber robot system in high temporal resolution.
Main research interest of this in-situ climate change experiment is to detect impacts of changes in climate on grassland soil hydrology, C and N turnover and associated losses in gaseous (CO2, N2O, CH4) and liquid form (DOC, DIC, DON, DIN) as well as biodiversity. Since September 2011 KIT is operating 36 lysimeters arranged in hexagons with a central service unit storing data loggers and other steering and sampling devices (6 in Graswang, 12 in Rottenbuch and 18 in Fendt) The lysimeters have an area of 1 m² and a weight of about 3 t, which is varying due to changes of soil water content.
Contact person: Ralf Kiese, Rainer Gasche