Abstract
The data of studies and calculations showing the high floristic similarity of the pine forests of the Russian Plain located in the southern part of Pinus sylvestris L. area. Especially high similarity is observed in the indigenous fraction of the flora. The similarity of floras in the adventive fraction is insignificant. Taking into account the forecast of a possible, in the near future, floristic homogenization due to the species of the adventive fraction, we calculated an estimation index, which indicates an opposite process of homogenization — differentiation. Given the division of advents into groups according to the introduction time, we calculated the estimated index separately for archaeophytes and kenophytes. It was revealed that in pairs of pine forests located relatively close to each other, archaeophytes enhance differentiation, and kenophytes enhance the homogenization of flora. Differential taxa (families, genera, and species) are found only in one of all the studied pine forests, that determine the characteristics of the studied floras. Endemic species have been established that give originality to the flora of the studied pine forests.
Highlights
Pine forests, on the southern limit of Pinus sylvestris, are widespread in the steppe and forest-steppe zones
In order to identify floristic similarities and differences, to establish the peculiarities of florogenesis due to the adventive fraction of the flora, we studied the pine forest flora of the Russian Plain: Usmansky and Khrenovsky (40210 hectares) located in the forest-steppe subzone of the Oka-Don lowland
The Jaccard coefficient was calculated both for the pine forests flora as a whole and separately for indigenous (КJind) and adventive (KJadv) species, dividing the latter into archaeophytes (KJarch) and kenophytes (KJken)
Summary
Pine forests, on the southern limit of Pinus sylvestris, are widespread in the steppe and forest-steppe zones. According to forecasts made regarding adventiv species of the flora of the Central Black Earth Region of Russia, [3] percentage of this fraction will steadily increase This is facilitated by climate change, increased anthropogenic transformation of landscapes and, as a result, the formation of derived landscapes with altered zonal communities. The same climatic features, characterized by sharp fluctuations in the conditions of a subarid climate, the difference in the historical and geological processes of the formation of territories, the features of anthropogenic impact can limit some and catalyze the penetration of other adventiv species. This process, the opposite of homogenization, is called differentiation
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