呼和浩特市的大青山区,在针叶树种中,落叶松(包括兴安落叶松和华北落叶松)是最耐寒的,垂直分布达到森林的最上限。它是喜光的强阳性树种,寿命长,树干通直高大,材质坚实,是一个优良的用材树种。落叶松生长迅速。人工营造的落叶松,9年左右可郁闭。郁闭后,进入生长旺盛期,高生长年平均70～80厘米,最高可达90厘米,径生长年平均1厘米左右,生长速度超过当地的其它针叶树种。呼市郊区古路板林场在土层深厚、 In Daqingshan District of Hohhot, among the conifer species, larch (including Larix gmelinii and Larix principis-rupprechtii) is the most cold-tolerant, and the vertical distribution reaches the upper limit of the forest. It is a hi-positive tree species of hi-light, long life, straight trunk tall, solid material, is an excellent timber species. Larix grows rapidly. Artificial larch, about 9 years can be closed. After the canopy is closed, it will enter the vigorous growth period with an average annual growth rate of 70-80 cm and a maximum of 90 cm. The annual growth rate is about 1 cm in average and the growth rate exceeds that of other conifer species in the area. Hohhot Suburb ancient road board forest field deep in the soil,