Архив метки: formation

DYNAMICS OF THE ECOLOGICAL STATE OF SOILS AND FLORA AFTER A FOREST FIRE IN THE EUROPEAN PART OF RUSSIA

Arid Ecosystems

Grigorievskaya A.Ya., Gorbunova Yu.S., Devyatova T.A. DYNAMICS OF THE ECOLOGICAL STATE OF SOILS AND FLORA AFTER A FOREST FIRE IN THE EUROPEAN PART OF RUSSIA // Arid ecosystems. 2021. V.27. № 3 (88). P. 37-44.

The 10-year dynamics of the catalase activity of leached chernozem was studied in order to determine the intensity and direction of redox processes in the post-pyrogenic ecosystem located in the forest-steppe of the European part of Russia. The results of studying the Pinus sylvestris formation with the coordinates of the background north latitude are presented (N 52° 30ʹ 39.2ʺ, E 38° 57ʹ 30.3ʺ), pyrogenic (N 52° 30ʹ 37.3ʺ, E 38° 57ʹ 28ʺ) areas after a forest fire in 2010. The species composition of plants in forest formations was revealed by laying test plots 20×20 m2 in size, within which 10 counting areas 1×1 m in size were described. The tiers were set according to the height of trees and grass stand. The plant communities are named by the method of listing the dominants established by the coverage. Abundance was counted according to O. Drude’s scale. Three phases of the restoration of the pyrogenic formation were identified: 1 – the phase of the ruderal phytocenosis (2010-2012), 2 – the phase of transformation of the ruderal phytocenosis (2014-2017), 3 – the initial phase of the restoration of the forest phytocenosis (2018-2020). Analysis of the catalase activity of the soil and the structural ecobiomorphological characteristics of the flora gives an opinion on the temporal aspect of the restoration of the forest ecosystem in the forest-steppe zone after a forest fire under conditions of moisture deficit. The absolute values of the regression coefficient of catalase activity in leached chernozem sharply decrease in the studied series of soils from background (0.42) to pyrogenic (0.15) and increase 10 years after the fire (0.23). Analysis of catalase activity and flora structure reflect the 10-year dynamics of the formation of a forest ecosystem with pyrogenic disturbance.

Keywords: flora, formation, pyrogenic and background site, catalase activity.

DOI: 10.24411/1993-3916-2021-10161

PHYTO-DIVERSITY CONGITION OF PYROGENIC FORMATIONS OF USMANSKY FOREST IN VORONEZH REGION

Arid Ecosystems

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