华北落叶松是华北地区生长最快的针叶树种,能长成高大乔木,材质好,耐腐朽,是优良用材树种。大青山林场五十年代引进的华北落叶松,现在胸径达20多厘米,高15米左右。一般用不了二十年就能出椽材。培育一株椽材的成本只要二、三角钱,一根椽能卖二、三元。一、造林地的选择。华北落叶松是山地耐寒树种。阴山山地海拔一般不超过两千米,华北落叶松在两千米以上的山梁还能正常生长,但在1500米以下造林时一定要选在大阴坡,如在1700米以上造林可不考虑坡向坡度。因为高海拔处土壤和大气湿度较高,适宜它生长。造林地土层应在40厘米以上,在淋溶灰褐土、山地草甸黑钙土或暗栗钙土中都能正常生长,只要土层深厚或凡是有白桦次生林生长的地方,都可 Larix principis-rupprechtii is the fastest-growing conifer species in North China. It grows into tall trees with good materials and decay resistance. It is an excellent timber species. Daqingshan forest farms introduced in the 1950s Larix principis, now diameter of more than 20 cm, 15 meters high. Generally can not spend two decades can produce rafters. The cost of cultivating a rafter just two or three cents, a rafter can sell two or three yuan. First, the choice of afforestation. Larix principis-rupprechtii is a species of hardy species in mountainous areas. Yinshan Mountain elevation generally not more than two kilometers, Larix principis-rupprechtii more than two kilometers of the mountain beam can grow normally, but in 1500 meters below the afforestation must choose the big shady slope, such as in 1700 meters above the afforestation regardless of slope slope. Because of the high altitude of the soil and atmospheric humidity is high, suitable for its growth. Afforestation soil should be more than 40 cm in the leached gray cinnamon, mountain meadow chernozem or dark chestnut soil can grow normally, as long as the soil is deep or where there is a growth of secondary birch wherever