Growth of artificial pine forests under influence of thinning

Efficiency of thinning in pine forest plantations on stationary objects in the middle taiga subzone of European North was determined. The studies were conducted in pine forest plantations created in 1961 by mechanized sowing of fresh burning. Two methods of thinning were implemented. Four variants of plantations with a various number of trees per ha were developed. Silvicultural and economic efficiency of thinning in pine forests plantations was confirmed by the results of our research. It is recommended to empliment the first method of silvicultural thinning in pine forest cultures after they reach the age of 10-15 years. It helps to create a desired composition and to reduce the muffling effect of small-leaved species. The next method should be directed at optimum density development. The best growth of perspective trees is achieved after high-intensity thinning with general density of 1,5 thousand trees per 1 ha, leaving trees of 20 years old.