Plants of the calcifilic flora exposition of the N.V. Tsitsin Main Botanical Garden of the Russian Academy of Sciences, listed in the regional Red Data Books of Central Russia

. The results of conservation of plants of the exposition of the calciphilous flora of the Main Botanical Garden of the Russian Academy of Sciences, listed in the regional Red Data Books of Central Russia, are shown. For 12 years, in the culture of GBS RAS, in the conditions of Moscow, 118 calciphilous species listed in the regional Red Books, represented by 77 genera from 34 families, were studied. Among them, in terms of introduction resistance, resistant ones prevail - 46% and highly resistant - 35.5%, weakly resistant - 13.5%, unstable - 5%. The main groups according to ecological confinement are considered: obligate (25%) and facultative (75%) calciphilic species. The experiment proved the importance of using special agricultural techniques for the successful adaptation of representatives of this group. In total, an average of 70% of calciphilous taxa of regional protected lists were tested. The representation of calciphilic species in the regional Red Data Books of Central Russia is different and is due to the natural features of the distribution of their classical habitats. In the regions of the Chernozem region, this figure ranges from 55% in the Belgorod region to 24% in the Tambov region. In the Non-Chernozem region: Bryansk, Ryazan, Tula regions, calciphilic species in relation to the total number of protected species also represent a significant part - 25%. For Vladimir, Ivanovo, Kaluga, Kostroma, Smolensk, Tver, Yaroslavl regions and the federal city of Moscow, calciphilic


Introduction
The basic principle of conservation of vulnerable taxa of natural flora implies an appeal to the current lists of protected plants in Red Data Books of various ranks. In this regard, using the example of rare calciphilic species preserved in the GBS collections, we decided for the first time to show the role of this ecological group in the regional Red Data Books of Central Russia. Central Russia or the Central Federal District of the Russian Federation, with a population exceeding 40 million hours and a density of more than 62 people. /km² is the most densely populated and developed macro-region of the Russian Federation, located in the southwestern part of the Russian Plain. It covers 17 regions and one city of federal significance, the total area of which is 650,205 km². The northern part of the territory of Central Russia includes the regions of the Non-Black Earth Region: Bryansk, Vladimir, Ivanovo, Kaluga, Kostroma, Moscow, Ryazan, Smolensk, Tver, Tula, Yaroslavl regions and the city of federal significance Moscow, the southern part includes the regions of the Black Earth region: Belgorod, Voronezh, Kursk, Lipetsk, Oryol, Tambov regions. Over the past century, the main threats to floristic diversity have been caused here by a high degree of agricultural and industrial development, which in some regions has led to anthropogenic transformation of more than 80% of the territories. Maintaining Red Data Books in Central Russia is a necessary and most important condition for monitoring the conservation of biodiversity and sustainable development of regions, but often it does not happen simultaneously and not in a timely manner, which requires a more careful attitude to the problem. In this study, the latest editions of Red Data Books and lists of rare species are taken into consideration.

Materials and methods
A representative collection of rare calciphilic plants has been formed at the GBS RAS since 2009 and represents, among other things, an extensive group of Red Data Books species of the regions of Central Russia. Within the framework of the GBS RAS program for ex situ biodiversity conservation, a number of expeditions were carried out in certain areas of the macroregion: Belgorod, Voronezh, Kursk. To study the group ex situ in natural conditions, seed samples of more than 100 species were collected, the collection of samples of living plants was often carried out in protected areas, so the minimum number of samples was taken (no more than 1-2). The main approach in the adaptation of rare plants was the creation of the most favorable growing conditions under the conditions of a special exposition and the use of agricultural techniques appropriate for each individual taxon.
The representation of calciphilous species in the regional Red Data Books of Central Russia is different (Figure 1 In total, since 2009, an average of 70% of calciphilous species listed in the regional Red Data Books of Central Russia have been tested under the conditions of the GBS RAS. The shares of the most vulnerable categories: 0, 1, 2 in the group of calciphilous species of regional Red Data Books of Central Russia are shown in (Figure 2). Regional differences in their indicators can be due to both natural and anthropogenic factors. In such regions of the Chernozem region as: Belgorod, Voronezh, Kursk, Lipetsk, Oryol, the share of these categories as a whole increases, probably depending on the reduction in habitat areas and the increase in precipitation in these regions and the influence of factors of unfavorable environmental conditions. Significant differences are observed between the Belgorod and Oryol regions -19 and 98%, respectively. In the Tambov region, with a fairly high representation of calciphilous taxa, the proportion of species of such categories is 26%, which may be due to the favorable environmental situation in the region. In the protected lists of the Non-Chernozem regions adjacent to the Chernozem region: Bryansk, Kaluga, Ryazan, Tula regions, the share of the most threatened categories of calciphilous taxa is significant: from 51% in Ryazan to 100% in Bryansk.
Kostroma, Smolensk, Tver regions -30%, in Moscow and Yaroslavl regions -97 and 81%, respectively. In Moscow, despite the insignificant presence of calciphilous species in the region, the share of vulnerable categories exceeds such indicators in most other regions of the Non-Black Earth Region -70%. In general, for the macroregion, the average value of the shares of calciphilic species of categories: 0, 1, 2 is 58%.

Conclusion
In total, since 2009, 118 calciphilic taxa have been tested under the conditions of the GBS RAS, that is, on average, about 70% of the species included in the regional Red Data Books of Central Russia. According to the introduction resistance, the following distribution was obtained: unstable -5%, weakly resistant -13.5%, resistant -46%, highly resistant -35.5%. In terms of ecological confinement, the group of facultative species predominates -75% of calciphilic species, obligate -25%. An important condition for the successful adaptation of representatives of this group is the observance of the necessary agricultural technology. The representation of calciphilous species in the regional Red Data Books of Central Russia is primarily due to the natural features of the distribution of calciphilous ecological and floristic complexes. Therefore, the regions of the Chernozem region: Belgorod, Voronezh, Kursk, Lipetsk, Orel, Tambov regions are characterized by a wider distribution of classical habitats of calciphilic species. At the same time, the inclusion in the Red Data Books of these regions of large groups of calciphilous species -an average of 36% of the total number of protected plants indicates a high vulnerability of their habitats.
In the protected lists of the majority of the Non-Chernozem regions adjacent to the Chernozem region: Bryansk, Ryazan, Tula regions, calciphilic species in relation to the total number of protected species also represent a significant part -25%. For Vladimir, Ivanovo, Kaluga, Kostroma, Smolensk, Tver, Yaroslavl regions and the federal city of Moscow, calciphilic taxa represent an average of 9% of protected lists.
The share of calciphilous species of the most vulnerable categories: 0, 1, 2 in the regional lists of Red Data Books averages 58%.