INFLUENCE OF TREE CROUNDS ON THE GRASS-SHRUSH STORY OF PINE PLANTINGS IN THE NORTHERN FOREST-STEPPE OF THE TYUMEN REGION

Kulyasova Oksana Alekseevna, Iglovikov Anatoly Valerievich

In the conditions of the northern forest-steppe of the Tyumen region, the composition and structure of the herb-shrub layer of 30-year-old pine crops with different crown density were studied. It is shown that with an increase in crown density of the edificator tree stand from 0.6 to 0.9, the species richness of the layer decreases (from 81 to 27 species), species richness (from 8.2 to 2.3 species/m2), and the total projective cover of the layer (from 41.7 to 8 .5%), total above-ground phytomass (from 39.6 to 10.1 g/m2). In pine forests with a crown density of 0.6, the ratio of heliophytic and semiheliophytic species of the layer is 60.5% and 39.5%; in pine forests with a density of 0.9 – 37.0% and 63.0%, respectively. In plantations with a crown density of 0.6, the leaders are species of the betular and meadow ecological-coenotic groups; in pine forests with a density of 0.9 – species of the betular and boron ecological-coenotic groups.

Keywords:crown density; herbaceous-shrub layer; projective coverage; heliophytes; semiheliophytes; ecological-coenotic groups; northern forest-steppe.