Grigoryevskaya A.Ya., Devyatova T.A.,  Gorbunova Yu.S.,  Sorokina N.A. PHYTO-DIVERSITY CONGITION OF PYROGENIC FORMATIONS OF USMANSKY FOREST IN VORONEZH REGION // Arid ecosystems. 2019. V. 25. № 4 (81). P. 42-51. | PDF

We present the results of Pinus sylvestris and Betula pendula formations (N 51° 48’ 30.1’’, E 39° 23’ 58.4’’) research made in 2015-2016 after the forest fire of 2010. The description of these formations has been started in 2012. The methods of the plant community structure analysis are important for cognition of their yearly ecological condition and detecting of plants sustainability to the pyrogenic factor. On the example of the background and pyrogenic associations of these formations we provide the data on the beginning of recovery of the phytocenosis structure and flora, dominants changes in the layers, projective cover increase and forest phytocenosis forming. We registered the decrease of species diversity and projective cover for weeds. The present list of flora has 84 species of 75 genera, 33 families and 2 divisions: Pinophyta and Magnoliophyta. The leading families are Poaceae with 12 species (14.1%), Asteraceae with 8 species (9.4%), and Fabaceae with 6 species (7%). The small spectrum of these leading families proves the high pyrogenic disturbance of the flora. The dominance of the rhizome plants (42 species or 44.6%) and small amount of sod grasses (4 species or 4.8%) indicate the advantage of the forest phytocenotic group. The xerophytic group (15 species or 7.9%) indicates the heightened illumination and lowered moisturizing of the formations after the fire. We revealed 8 geo-elements and 14 areas. European geo-element with 53 species (63.1%) and 12 areas types is the dominant.

Keywords: flora, formation, pyrogenic and background phytocenosis, association.

DOI: 10.24411/1993-3916-2019-10072