Natural valorization of degraded swamp-originating meadows of Lower Silesia (Extension of the Oświt method)

Abstract

Swamp-originating meadows constituting indirect habitats between living peatlands and classical grasslands may be difficult to evaluate. An indiscriminate application of the oświt (2000) method for their valorization does not fully reflect their value, because of flora which is different from flora found in living peatlands (in particular, the invasion of less hygrophilous flora). Based on the research carried out in the years 2005-2010 on eight swamp-originating meadow complexes, the scale was elaborated which enabled to more accurately valorize these habitat and floristically changed areas. The quantities of valorization values obtained by use of the author's method rely on the occurrence frequency of a given species (a number of posts in a given area), taking into consideration moisture requirements (the moisture indicator). In the author's method values were also given for species not taken into account by oświt (2000). In addition, positive points were given for dying out species, and negative points for invasive species.

Invasive populations of Spiraea tomentosa (Rosaceae) are genetically diverse but decline during succession in forest habitats

“…tomentosa is found in wet meadows, wet forests and bogs. It has rapidly become a major threat to habitats of high conservation value (Podlaska 2014b; Wiatrowska & Danielewicz 2016), and several studies have reported significant impacts on native species composition and diversity (Podlaska 2014a,b; Wiatrowska & Danielewicz 2016; Balkenhol et al . 2018).…”