In the course of geobotanic studies in a selected region in the Western Parts of Krkonoše Mountains, it was recorded in the environment of soil two antithesical processes. On the one side in autochtonous soil, on local position indirectly antrophic influenced by imisis leads to the acidification of soil. In the space of years 1968 - 1989 it was recorded in 100 specimens of soil an average decline pH of rhizosfere autochtonous ecosystems about a value of 0,4 (from an average of pH 4,5 on 4,1). On the other side in the local position the influence of man, in the surroundings of paths and roads, chalets and their ruins leads to basification and eutrofization. This phenomenon causes the use of dolomite dimestones and crus of melaphyr to harden of paths and roads unsuitable use the slem clearance and recultivation of alochtonical soils. Increase of value pH of rhizosphere ( ap to 7,9) CaO, MgO, P₂O₅ etc. condicinal occerrence of synantrop flora and vegetation destroy ecosystems of Krkonoše Mountains.