Xerothermic grasslands are veritable botanical gems of the Ponidzie region, located in the upland zone of Poland. Most of these exceptional plant communities have been formed as a result of deforestation, in habitats characterized by specific climatic, hydrological and soil conditions. The result of the natural reserve protection of the xerothermic grassland, however, is opposite to the desired result. The survival of the xerothermic grassland depends on the change in the approach to their protection. Xerothermic grasslands are an excellent example of the difficulties with maintaining very valuable, but semi-natural and anthropogenic communities, related to a large extent to traditional, extensive forms of agriculture. Similar problems occur in the case of gladiolus meadows in lower subalpine forest zones or of once-mown molinion meadows in river valleys.
The sensibility of landscapes in the area of transition between pleistocen's terraces and bottom of river's valley is described in article. The part of Nida's valley was taken as an example. Presented area is a belt of mixing impacts connected with two fully different landscape's types. These mixing („fighting”) result distinct spatial and seasonal variability of water hardness and water reaction. The great sensibility of these landscape is manifested very slow recovery soil's and vegetation's features, after activity of antropogenie factor, to earlier state.