Pinus sylvestris var. mongolica Litv is one of the chief forest species in northern China. To study its growth characteristics and its relation with the stand density is significant to its introduction and cultivation in the north part of China, since stand density is one of the factors that affect its growth. Therefore, the forest stand of P. sylvestris var. mongolica with 3 groups on different densities (>3000 plants/hm², 2000-3000 plants/hm² and 1000-2000 plants/hm², respectively) in 8 sample fields are measured and studied in the Naristai Forest Farm in the central part of Inner Mongolia Autonomous Region. The results show that the DBH, individual volume increment and the total volume of the forest stand are significantly affected by the stand density while the height growth is not. In other words, the stand density has a significant impact on DBH, the individual volume increment and the total volume. As the stand density increases, the DBH and individual volume increment are decreasing while the total volume is increasing. The difference of DBH between the high density groups and the low density groups is 10 cm, while the difference of total volume increment is 0.9 m³. This study also indicates that the higher the stand density, the greater the initial age of the forest stand at which trees begin to grow rapidly.

Pinus sylvestris var. mongolica Litv  /  stand density  /  DBH  /  tree height  /  individual volume