Ecological and biological aspekt new locality of Drosera anglica Huds. near Końskich

Abstract

The work concerns the occurrence conditions Drosera anglica. (EN) within the site located 10  km  from the village of au nord   Końskie near   the Czarna River. The species is very dispersed but in a few places the density was 5-10 of specimens per 1m2. This species grows within a patch which is poor in terms of its flora. No significant expansion of trees or shrubs has been noted. This is related to quite a high level of water. Such conditions are favourable to the development of another species under threat of extinction, Rhynchospora alba. Plant-based patches with participation of sundew are heterogeneous in terms of syntaxonomy.  Presence of species has been observed, e.g. from the classes of Phragmitetea and Scheuchzerio-Caricetea nigrae. Soil analyses indicate that the soils under observation are not very acidic, with average content of CaO and ash content which is optimal for this species with the ratio of C:N which indicates a temporary mire. The content of heavy metals is in norm and poses no threat to the surroundings (Pb 64-65 ppm, Cd 2.7-2.9 ppm). Wide ranges in the analysed samples refer to chromium. They do not have an adverse effect on the development of Drosera anglica. A very crucial threat is the consequence of succession, competition and hydrological conditions.