张家口地区林业局,1983年林木良种普查时,在燕山深处的涿鹿、坝上高原的尚义和长城脚下的崇礼三个县,发现了四片天然杜松纯林,共有1000多亩,仅涿鹿县较大的一片就近900亩。这些杜松一般都在几十年到百余年,生长良好,华北地区极为罕见。 杜松也叫(艹 朋)松、棒松,属柏科桧柏属,常绿乔木,树高可达10米。小枝下垂,树冠呈圆锥形,是我国珍贵树种之一。杜松为阳性树种,适应性很强,具有喜光、抗寒、耐干旱、耐瘠薄等特点。多生长在阳坡、半阳坡,岩石裸露的山地也能生长,树根能沿石 Zhangjiakou Regional Forestry Bureau, 1983 census of forest species, deep in the Yanshan Zhuolu, Bashang plateau Shangyong and the foot of the Chongli three counties, found four natural juniper pure forests, a total of 1000 mu, only Zhuolu County, a larger area near 900 acres. These junipers are generally in decades to hundreds of years, grow well, North China is extremely rare. Juniper (also known as Peng) pine, pine, is a cypress cypress genus, evergreen trees, trees up to 10 meters. Branch drooping crown was conical, is one of China’s precious tree species. Juniper positive tree species, adaptability, with hi light, cold, drought, barren and so on. More growth in the sunny slopes, semi-sunny slopes, rocky bare mountains can grow, the roots can be along the stone