新疆地处祖国西北边陲,欧亚大陆中心,四周环绕高山,气候极为干旱,在针叶树能够生长的中山带,虽年降水量较多,但也不超过500—700毫米,且气候寒凉,月均温有7个月在0℃以下,苗木适生期仅1.5—2个月,当年生苗一般只刚长出真叶,有的年份甚至仅长出子叶。更新用4—5年生的苗木,植株高度仅10—15厘米林区土壤肥沃,发育在贡土母质上的黑褐色森林土,有丰富的钙质和盐基饱和胶体及很厚的粗细腐殖质层,有机质含量很高,土壤水浸出液pH值为5—6.5,氮、钾养料不缺,唯有效磷稍低, Xinjiang is located in the northwestern border of the motherland, the center of Eurasia, surrounded by mountains, the climate is extremely arid, in the conifer mountains can grow, although the annual precipitation is more, but not more than 500-700 mm, and the cold climate, the month Average temperature of 7 months at 0 ℃ below, seedling fitness period of only 1.5-2 months, year seedlings generally just grow a real leaf, and some even grow only cotyledons. Updated 4 - 5 year-old seedlings, plant height of only 10-15 cm forest fertile forest, developed in the tribute soil on the dark brown forest soil, rich in calcium and salt-based saturated colloids and thick thick humus layer , High organic matter content, soil water leachate pH value of 5-6.5, nitrogen, potassium nutrients is not lacking, only slightly lower phosphorus,