Главная Коллекция "Revolution" Сельское, лесное хозяйство и землепользование Эколого-ценотические позиции Maianthemum bifolium (L.) F.W. Schmidt и Linnaea borealis L. на северной периферии ареала

Эколого-ценотические позиции Maianthemum bifolium (L.) F.W. Schmidt и Linnaea borealis L. на северной периферии ареала

Исследование закономерностей в распространении майника двулистного и линнеи северной в пределах тайги Европейской России. Выявление неоднородности в экологической и ценотической приуроченности видов. Изучение показателей увлажнения и богатства почв.

Рубрика Сельское, лесное хозяйство и землепользование
Вид статья
Язык русский
Дата добавления 21.09.2020
Размер файла 374,1 K
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The size of description samples is shown in Figure 1.

The ecological amplitudes of the species were calculated on the basis of LG Ramensky's ecological scales; the mean values of moisture and nutrient status scales, standard deviation and confidence intervals for p<0.05 were calculated.

For calculations, we used more than 150 geobotanical releves from publications on the Khibiny, the Belomorskaya lowland, the Dvinsko-Mezenskaya plain, the Timan Hills, the Pechora plain and the Subpolar Urals (See Table 2). Using the obtained data, we constructed point ecological ranges of communities with L. borealis and M. bifolium.

We calculated mean values of stages of soil moisture and richness, standard deviation and confidence intervals of the obtained values at the level of statistical significance p< 0.05 (See Fig. 3, a and b).

The cenotic connections were estimated by the number of forest types where the species were observed in different regions of the northern taiga.

The change in the ecological positions of L. borealis и M. bifolium was traced by a change in their constancy in ecological series of communities by soil moisture and richness, created on the basis of PS Pogrebnyak's edaphotopic grid using geobotanical materials from the Pinega River Basin (See Fig. 4 and 5).

In the course of the study, we revealed that the constancy indexes of L. borealis and M. bifolium in the northern taiga vary from west to east: for L. borealis the maximum values were recorded in the Khybiny and Dvinsko-Mezenskaya plain; for M. bifolium - only in Dvinsko-Mezenskaya plain (See Fig. 6, Table 3).

The calculated ecological amplitudes (according to moisture and nutrient status scales) for both species are narrower in comparison with potential ones.

We noted a shift in ecological positions from more humid and nutrient-poor in the west to drier and nutrient-rich stages in the east within the plain part of the subzone.

The maximum amplitude by the moisture factor for both species were observed on the Dvinsko-Mezenskaya plain, while the largest nutrient status amplitude was detected in the Pechora lowland.

The cenotic connections of both species might be explained by differences in ecological positions within the subzone: the maximum number of forest types with both species occurrence was noted for the Dvinsko-Mezenskaya plain; for the Pechora lowland, the maximum constancy indexes of both species were observed in spruce and larch forests on the well-drained plain and upland areas in the central as well as eastern parts of the subzone where a moderately continental climate is inherent.

The minimum indexes were marked in pine forests of wet poorly drained lowlands in the western and eastern parts of the subzone.

The paper contains 6 Figures, 3 Tables and 49 References.

Key words: ecological amplitude, plant species phytocoenotic fidelity, plant constancy indexes, boreal plant species.

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