Description
This is a station of eminently botanical importance due to the presence of rare or uncommon floristic species in Trentino.
The Polsa Pond is an almost oval-shaped marsh located in correspondence with an outcrop of marly rocks that are not very permeable to water and allow the water table to surface. Within it, peaty clay deposits of great scientific interest have been found.
Most of the surface is occupied by Carex elata, which forms dense tufts several tens of centimetres high, separated by small depressions in which water stagnates for almost the entire year, and, in areas that are generally always submerged, by phragmites bog grass (Phragmites australis). In places where the water depth exceeds one metre, there are a few pools of Potamogeton natans and Lemna minor. At the outer edge of the sedge bed, where the amount of water is less, there is a thin strip of wet meadows with Scirpus sylvaticus and Carex acutiformis, where splendid blooms of Dactylorhiza incarnata can be observed.
During recent inspections, the presence of theYellow-bellied toad(Bombina variegata) was ascertained in two areas of ephemeral water stagnation at the edge of the fragmiteto.
