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  Study sites of sulpho-rendzinas in NW Russia
 

    Soil-forming conditions:

  • Humid moderately-cold climate;
  • Outcrops of Lower Permian gypsum;
  • Karst topography;
  • Oligotrophic open-wood communities atypical for the northern taiga; diversity of habitats with rare and endangered plants, including gypsophyte and arctic-alpine species.

 
Gypsum rock in the taiga landscape.                  Taking samples of sulphorendzina.


Plants on sulphorendzinas (from left to right): gypsophyte Gypsophila uralensis, arctic-alpine species Dryas punctata, insectivorous plant Pinguicula vulgaris and orchid Calypso bulbosa.

The prevalence of gypsum amongst parent rocks causes oligotrophization of taiga communities and appearance of open woodlands. Sulpho-rendzinas i.e. soils that are formed directly on gypsum dominate in the soil cover (examples of their profiles are shown below). Their neighbours are peat soils at the bottom of sinkholes and soils on glacial deposits underlain by gypsum.

     

    

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 laboratory analyses - findings - world occurrence

 

 
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