Improvement of environmental efficiency of plants of green zones by creation of subordinate crops of Siberian stone pine

Abstract

It is topical to increase the ecological efficiency of plantings of green zones of settlements by creating Siberian stone pine crops. The subordinate crops of this type, which were created in 1966 by quadrennial seedlings of different geographical origin at thick planting, were observed (9 pieces in a site measuring 0.7 x 0.7 m, the distance between the centers of the sites is 4 m). It was found that the canopy closure of the stand, consisting of birch and pine, has a significant effect on the growth rates of subordinate crops of Siberian stone pine. So at canopy closure 0,1-0,1 52 years old crops, despite the different geographical origin, had the highest rate of height, stem diameter, crown, number and diameter of lateral branches on the lower live node in comparison with the closure of 0.6-1.0 Average increment of branchlets at 32 year period was by 49,8% more in trees, growing at a canopy closure of 0,2 against 0,7-0,8. Trees growing on the open area characterized by early seeding, were selected and propagated by engrafting.