THE STUDY OF THE GROWTH OF MIXED FOREST PLANTATIONS IN THE STONY SOILS OF NORTHERN KAZAKHSTAN
The purpose of the study was to find out the most economic and effective ways of growing artificial plantations on the slope of 12-15°. The objects under study were 45-year-old mixed plantations in Akmolinskaya oblast. The plantations grew on the hill with the slopes of Western and South -Western exposition. While creating forest plantations different types of tillage were used. The preservation of Scotch pine varied from 36.0% (on the Western slope) to 70.0% (on the South -Western slope). The plantations planted on the Western slope on the strips of 5-7 meters wide were marked by the most uniform growth. The growth of larch did not differ much on the test plots regardless of the quantitative composition. The worst preservation (53.5%) was in the middle of the South-Eastern slope, and the best preservation was on its trail (73.1%). The height and the diameter of larch Siberian, which grew on the strips of 3-5 meters wide on the South-Eastern slope, was 1.1 times bigger than those on the Western slope. The preservation of birch on the samples was 47.7% and 56.4%, the average height was 13.1 m, the average diameter - 13.4 sm. For 45-year-old plantations these biometrics of Silver birch were not big as the site conditions were fairly unfavorable for this species. The plantations of Scotch pine created by sowing on the upper part of the slope lay behind in growth from the plantations created by planting; however, they had a higher rate of preservation. The tillage by the strips of 3-7 meters wide turned out to be the most effective one. Scotch pine grew worse on plow furrows than on any other variant.