论文部分内容阅读
铅笔柏(Juniperus virginiana)为高大乔木,原产北美和加拿大东南部,适应性广,能在石灰岩和砂质山地上生长,抗寒,耐干旱瘠薄,耐盐碱并稍耐水湿。北京市九龙山试验林场1975年从山东泰安农学院引种,通过5年驯化已在山地栽植。一、播种育苗(一)种子处理铅笔柏引进果实总重量1100克,出种率16%,千粒重6.5克。种子具有不透水的种皮
Juniperus virginiana, a tall tree native to North America and southeastern Canada, has wide adaptability and is capable of growing on limestone and sandy mountains. It is cold-hardy, drought-resistant and infertile, salt-tolerant and slightly water-resistant. Jiulongshan Experimental Forest Farm in Beijing was introduced from Tai’an Agricultural College in Shandong in 1975 and has been planted in the mountain areas after 5 years of domestication. First, the sowing seedlings (A) seed treatment Penaeus lead the introduction of the total weight of 1100 grams of fruit, a seed rate of 16%, 1000 grain weight 6.5 grams. Seed has impermeable seed coat