TURN THE GROWTH OF LARCH PLANTATIONS IN CONDITIONS OF THE ALTAI-SAYAN MOUNTAIN FOREST DISTRICT
Currently, in the Siberian region there is an intensive felling of larch plantations. The high market value of larch wood leads to the fact that tenants barbarously destroy valuable and now rare for the territory of the southern part of Central Siberia larch plantations. Similar processes are observed in the Altai-Sayan mountain-forest region. All these negative processes make it necessary to study the history of growth of the most common (modal) larch trees of the studied area. The development of larch forests ooccoo-herb forest type corresponds to the age of time frames that best capture the features of the growth of the investigated stands. As a result of the research the following conclusions are obtained. Larch Siberian (Larix sibirica L.) is one of the most durable tree species, which in terms of climate change allows a long period of time to accumulate carbon in the atmosphere. The leading factors of violation (destabilization) of forest ecosystems of the territory are fires and cabins of the main use. On the territory grow both pure and mixed larch plantations with a share of 40 to 90 % with admixture of birch, aspen, fir and cedar. The undergrowth is quite rare on average 2 t. pcs/ha, group placement. In the undergrowth represented spirea, acacia less Rowan, bird cherry. Soils are predominantly loamy, fresh. Dominated by stands of bonitet III. The conditions of growth of larch forests, mountain slopes of any exposition and slope. Sketches of table of the growth of modal larch plantations of the Altai-Sayan Ecoregion are made. The age of natural ripeness for larch plantations was 120 years. The age of technical ripeness is 100 years and it is closer to the period of optimal cutting of larch plantations (101-120 years).