珙县上罗区从1975年开始在海拔50O—800米的山地进行杉木冬季育苗.76年12月份又在海拔800米(上罗公社林场)育杉木2亩,并在同一块地上搞冬春育苗对比.播种一月以后,冰雪持续15天左右,雪厚约50厘米,到次年4月初种子发芽出土比春播育苗发芽整齐,生长快,到出圃时,比春播高10厘米.每亩生产万株壮苗,平均高在30厘米,最高的40厘米. Shangluo District, Shexian County has been carrying out winter seedling cultivation of fir at a mountainous area of ​​50 to 800 meters above sea level since 1975. In December 76, another 2 hectares of Chinese fir were planted at an altitude of 800 meters (Shangluo Commune Forest Farm) Seedling contrast After sowing in January, the snow lasts about 15 days and the snow thickness is about 50 centimeters. By the early April next year, the germination of the seed germinated and grew faster than that of the spring sowing seedling. Million strong seedlings, with an average height of 30 cm, the highest 40 cm.