In the mountain conditions which are characterized by negligible amount of shallow groundwater, the typical representative is an experimental plot Zábrod - the meadow on Šumava Mountain. Here the water retention is considered as significant factor influencing hydrological cycle and phyto-mass production. Deficiency of water can cause warming, extremality of precipitation and production reduction. On the contrary lack of warm can cause only production shortage. High exchange of entropy at transpiration evaporation is a typical feature of hydrological cycle stability against harmful perturbation influence, and vice versa low entropy production signalizes its extremality.