The analysis of the dynamics of phyto-diversity over 10 years of the Pinus sylvestris L. formation in the Usman forest of the Voronezh region on the territory of Russia is carried out. We used formalized methods for processing the data array when describing 140 accounting sites of 1 m2 on two test sites in the background and pyrogenic formations of P. sylvestris. Accounting for abundance was conducted according to O. Drude. The pyrogenic factor, along with temperature, light, humidification, and edaphic conditions, has a strong effect on the phyto-diversity of forest ecosystems. Four phases of succession of pyrogenic phytocenoses with determination of time intervals between them have been established. The first phase of 2010 is a pioneer group, random plant species are noted, separated among themselves; second phase 2011–2014 – the pioneer group is being transformed, plants are being introduced, they are breeding, consort relations between organisms are appearing, a weed-ruderal erigeron-pine community (Pinus sylvestris – Erigeron canadensis) has been recorded; third 2015–2018 – the initial phase is herb-shrub, there is a restructuring of the structure of the plant community, which is expressed in the replacement of the dominants of the phytocenosis tiers; the fourth phase begins in 2019 – the formation of the forest phytocenotic group is associated with dimming and, as a result, a change in temperature. The characteristic of anthropotolerant groups is given. In the ratio of species in the background and pyrogenic areas to the total number, the replenishment of species diversity in pyrogenic areas is observed. The obtained values of the regression coefficient for anthropotolerant groups emphasize the sensitivity of the flora to the pyrogenic effects of especially synanthropophytes and hemiapophytes.
Keywords: formation, flora, pyrogenic factor, phases of succession, Usmansky pine forest, Pinus sylvestris L
Article published in number 3 for 2022 DOI: 10.25750/1995-4301-2022-3-192-198
ISSN 1995-4301
Select viewing options
