INFLUENCE OF PHYTOGENOUS FIELDS OF SCOTS PINE (PINUS SYLVESTRIS L.) ON YOUNG TREES GROWTH ON THE KUZBAS DUMPS

Abstract

Introduction. The phytogenous field of trees is the basic mechanism of endoecogenesis of young plantings of Scots pine on the dumps of coal industry. Stability of technogenic forest ecosystems is provided with their ability to reforestation which, in turn, depends on spatial structure of phytogenous fields in forest stands and at single trees. The goal of the research was to study natural regeneration under the influence of phytogenous fields of Scots pine growing in residual soils of Kuzbas coal industry. Objects and methods. The research was conducted in the pine plantings of the II class of age (27–28 years old) on dumps of Kedrovskiy Coal Mine, Kemerovo. 10 trial areas by the size of  10×10 m (5 trial areas with a density of crowns of 20–40 % and 5 – on the small meadows with a single model tree in the center) were established. Complete enumeration of undergrowth was carried out with the use of discount areas 0,5×0,5 m by the size (quantity and height of undergrowth were considered). Soil cover within each trial area was divided into under tree, close to tree, and external zones. The data of discount areas were distributed into groups according to their belonging to the zones. Accounting of distribution of seeds of  pine was carried out by means of box seeds-meters 1×1 m by the size, established in each zone of phytogenous field in triple repetition. Results. Horizontal differentiation of space by quantity and height of undergrowth, matching zoning of phytogenous fields is registered. Average height of even-aged undergrowth consistently increases from the under tree to external zones in 2,5–5 times. The maximum number of undergrowth is grown in the under tree zones of single trees (2,5±0,28 trees per 1 accounting platform which is 6 times more, than in the under tree zones of plantings), the minimum number of undergrowth is grown in external zones of single trees (0,31±0,02 which is 6 times lower than in the external zones of plantings). In the close to crowns zones, the number of undergrowth makes 0,1±0,01, there is no essential distinctions between the trial areas. The quantity of the fallen-down seeds at single trees in the zones of phytogenous fields highly correlates with undergrowth distribution and it sharply decreases in the external zones. In plantings, the combined impact of trees on dissemination of external zones is observed, it promotes forming of a large number of undergrowth growth with high taxation rates. Conclusion. Single trees of Scots pine growing on dumps can't be considered as reforestation source, the rarefied structure of plantings renders assistance to natural regeneration of pine. Thus, it is desirable to establish plantation-seeding forest plantations on the dumps.