乔木是城市绿化的骨干树种,它的生态效益、经济效益、 社会效益和景观功能是其他植物不能替代的。据资料介绍: 一亩树林每天能吸收67千克二氧化碳,释放49千克氧气,足 够65个人呼吸使用;因树种不同,每年可吸收的灰尘约22吨 至60吨。可见乔木的重要作用是不容忽视的。 北京地区园林绿化乔木主要品种有:侧柏、云杉、雪松、 Trees are the key tree species in urban greening. Its ecological, economic, social and landscape functions are irreplaceable by other plants. According to the information: A mu of forest can absorb 67 kilograms of carbon dioxide per day, release 49 kilograms of oxygen, enough for 65 people to breathe; due to different species, the annual absorbable dust of about 22 tons to 60 tons. Can be seen that the important role of arbors can not be ignored. Beijing area landscaping arbor major varieties are: arborvitae, spruce, cedar,