Study of pine forest crop grown in the process of reconstruction of low-value plantations in the Burabai state nationalnatural park

In the forests of Kazakhstan there is a clear tendency to increase the area ofdamaged ecosystems. Degradation of forests, deterioration of their health and productivity occur regularly. In these circumstances, theproblem of conservation and replenishment of the existing plantations for various purposes (forest plantations, protection and greenplantings, etc.) became so acute that it requires drastic measures. One such measure is to increase the forest cover in our country throughthe establishment of forest plantations. Forest plantations play an important and growing role in reforestation and afforestation. Plantingis appropriate if site conditions do not provide the natural recovery of forests or it is difficult, or forests previously never grew there. Theneed to create a new crop arises in cases where lumbering technologies are not conducive to natural reforestation or destroy the resumptionof pre-generation. Forestry methods are widely used in the reconstruction of low-value stands, mine reclamation, landscaping, andprotective afforestation. The object of study is pines, planted as reconstructions of low-value poplar crops (planted in 1978). The soil atthe site is dark gray forest, developed on the dense gravelly gruss rocks. The groundwater lies at the depth of 9-10 m. The height ofpoplar in the wings at the time of planting pines was 3.1 m. The pines were planted in 1988 as two-year seedlings after development of8.0, 9.5, 14.0 and 15.5 meters-wide corridors and a partial tillage. At the same location in the corridors of 9.5, 12.5 and 14.0 m widepines were planted in 1989 with a different number of rows (3 to 5). Later, poplars in the wings were cut down. To reduce the competitiveimpact of tree and shrub species growing in the wings on the growth of crops planted in the corridors, furrows were made 35-45 cmdeep (Certificate 673217) with an upgraded plow PKL-70. The furrows are located along the wings at a distance of 1.0-1.5 m from theirwalls. In the spring of 1990 experiments were conducted with planting 30 pieces of 2-year-old pine seedlings. Ice and sawdust wereplaced next to the rows in trenches. The control plants were planted without ice and sawdust. Analyzing the material obtained in the firstyears of observations (1988-1991) we can say that the best results in terms of growth options were number 2 and 8, with the 12.5 mwidth of the corridor. They were the leaders of all biometric indicators both in 1988 and in 1989.

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