Formation and self-maintenance of the population Hyssopus officinalis L. in conditions of the iron ore dump of Krуvyі Rih area

Keywords: Hyssopus officinalis, restoration, seed productivity, vital state, population structure, recultivation, iron ore dump of Kryvyi Rih area

Abstract

We ascertained the features of formation of self-renewing and self-sustaining of the local population of the Mediterranean introducent Hyssopus officinalis L. in the extremal ecologic and edaphic conditions of an iron ore dump in Kryvyi Rih Area, seeds of which have been sown on the area of 1 ha about 30 years ago. It was found that the species, during this period after reaching the reproductive phase of development, has taken the area of the dump of about 3 ha and, in fact, it formed the isolated population. This species annually multiplied by seed, and spread on the areas of ore dump, where almost no vegetation cover, in fact, performing a pioneer function. At the site, where the initial sowing of H. officinalis seeds was carried out, the phytocoenosis forms now; this phytocoenosis, according to its floristic composition, approaches the natural steppe, but the introduced species are gradually ousted. In habitats occupied by the species due to its spontaneous distribution, successional processes are at an initial stage. Within some of the population loci of H. officinalis, we have found up to 513 adult individuals with the number of generative sprouts from 20 to 70 per a plant. Flowers are formed on these sprouts in average from 160.2 to 181.6. Average seed productivity is 60 % of theoretically possible rate, and the seeds from the parent species extend to a distance of 1–5 m. In a compact areas where H. officinalis grows, there are plants of all the age groups – from the seedlings to the subsenile. H. officinalis has naturalized in the dump conditions, and its local population is а resistant, full-grouped; it develops under the conditions where other species are not competitive. Generatively developed plants are higher than 90 cm and have good vital state. The species on the dump shows pioneering features; it is not aggressive and can be displaced by zonal vegetation; thus, it does not pose invasion risk. H. officinalis can be recommended for the revegetation of iron ore dumps, or their large decommissioned areas, without technical preconditioning, only by direct sowing of the seeds into the dump rocks, to promote its spread artificially.

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Author Biographies

M. Baranets, Kryvyi Rih Botanical Garden of NAS of Ukraine

Marshak str., 50, Kryvyi Rih, Ukraine, 50089, kbsnanu@gmail.com

I. Korshуkov, Kryvyi Rih Botanical Garden of NAS of Ukraine

Marshak str., 50, Kryvyi Rih, Ukraine, 50089, ivivkor@gmail.com

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Published
2020-07-02
Cited
How to Cite
Baranets, M., & KorshуkovI. (2020). Formation and self-maintenance of the population Hyssopus officinalis L. in conditions of the iron ore dump of Krуvyі Rih area. The Journal of V.N.Karazin Kharkiv National University. Series «Biology», 34(34), 43-51. https://doi.org/10.26565/2075-5457-2020-34-5
Section
BOTANY