Ontogenetic characteristics of local populations of Linum flavum L. (Linaceae) in Penza region
Background. Comparison of ontogenetic indicators of local populations of the yellow flax plant Linum flavum L., rare for the Penza region, was aimed at assessing their current state as the basis for further monitoring and development of measures to protect the species to preserve the biodiversity...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Penza State University Publishing House
2024-11-01
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| Series: | Известия высших учебных заведений. Поволжский регион: Естественные науки |
| Subjects: | |
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| Summary: | Background. Comparison of ontogenetic indicators of local populations of the yellow
flax plant Linum flavum L., rare for the Penza region, was aimed at assessing their current
state as the basis for further monitoring and development of measures to protect the species
to preserve the biodiversity of the Penza region. Materials and methods. Under the conditions
of the protection regime (the natural monument “Urochische Cherdak”) and in the conditions
of the restoration of steppe communities on fallow land (the Ukhtinsky steppes tract), the
density, numbers, and ontogenetic structure of local populations of yellow flax were studied,
as well as the phytocenotic location of the species and its contribution to the structure
of communities at different stages restorative succession. Results. In the studied communities
of true and meadow steppes, steppe and true meadows, Linum flavum forms a caudex facultative-
root-sprouting biomorph. Shows traits of explerence. When the vegetation cover
is highly dense, it acts as an assectator with a projective cover of 2–4 %; populations have
a low density (2.5 pcs/m2). In disturbed communities it dominates and co-dominates (projective
cover 20–25%), increasing the density by an order of magnitude due to individuals
of the pregenerative period. Ontogenetic spectra in both cases are two-peaked – with a maximum
in juvenile and generative individuals; in weakly disturbed communities, the main contribution
to the structure is made by mature and old generative individuals, and in fallows –
by juvenile individuals (populations according to the “Δ – ω” classification are transitional
and young, respectively). Conclusions. The current state of both local populations is stable.
To preserve the population of Linum flavum and other rare species (Salvia verticillata, Senecio
schvetzovii, Aster amellus, Gypsophila altissima) in the vicinity of the village.
In Ukhtinka village it is rational to limit economic activity by organizing the natural monument
“Ukhtinskiye stepi”. |
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| ISSN: | 2307-9150 |