A large exclosure established in 1968 has been instrumented with measuring towers inside and outside with a constant measuring of temperature, moisture, wind, solar radiation, snow depth etc. above tree canopy and at 2 m height, as well as in soil at different depths. Snow depth manipulation is combined with this a grazing experiment. Simulated acid rain and/or heavy metal pollution irrigation with replicated factorial design since 1991 (this includes increased vs. ambient precipitation experiment as well). Common garden experiments with arctic treeline trees. Replicated warming experiment in pine forest (10 pairs of 7 m2 plots).