Population Density of Convallaria majalis in Different Phytocenoses of Shostka Geobotanical District of Sumy Region (Ukraine)
DOI:
https://doi.org/10.29038/2617-4723-2020-1-389-15-19Keywords:
population density, Convallaria majalis, formation, subformationAbstract
The paper contains the characteristics of the population density of Convallaria majalis plants in different phytocenoses of Shostka geobotanical district. The groups in which the populations of C. majalis are represented are different by the dominants of the forest tier. Two of them (Pinetum (sylvestris) sorboso (aucuparii)–elytrigiosum (repentis), Pinetum (sylvestris) coryloso (avellanae)–urticosum (dioicae)) are dominated by Pinus sylvestris L., in three (Quercetum (roborisvel aorylory aory))–Fragariosum (vescae), Quercetum (roboris) coryloso (avellanae)–poosum (nemoralis), Quercetum (roboris) poosum (nemoralis))–Quercus robur L., in one (Querceto (roboris)−Aceretum (platanoidos) elytrigietum (platanoidos)) repentis))–Acer platanoides L. when dominated by Quercus robur and two more Tilia cordata Mill. when dominated by Quercus robur.
In the studied populations of C. majalis, the population density values generally range from 20,4 to 45,5 plants/m2. Вut, the highest density values were found in the Querceto (roboris)−Tilieto (cordatae) convallariosum (majalis) group, respectively, reaching 45.5+5.13 plants/m2. In the Quercetum (roboris) coryloso (avellanae)–fragariosum (vescae) group, the values of this characteristic are, in contrast, reduced to 20.4+1.50 plants/m2.
Some regularities have been identified in the distribution of population density values. Populations of C. majalis, formed under the pinnacle forest, tend to have smaller population densities than those growing in deciduous forests. An expressed increase in population increase in population density is manifested in many common pine-deciduous forests. Accordingly, an analysis of the change in population density of C. majalis was conducted against the background of the growth of their populations in different forest plant conditions: common pine forests: (formation Pineta sylvestris, subformations Pineeta sylvestris); 2– oak forests (formation – Querceta roboris, subformation Querceeta roboris); 3 – common oak-maple forest (formation – Acereta platanoiditis, subformation Querceto (roboris) – Acereta platanoiditis); 4 – oak-linden forests (formation – Tilieta cordatae, subformation Querceto (roboris) – Tilieta cordatae).
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