论文部分内容阅读
油松,常绿乔木,高达25米,胸径100厘米,树皮龟甲状开裂,深灰色,条芽褐色,叶为两针一束,间有三针,叶粗而硬,深绿色,果褐色,常留在树上不落,极喜阳光,深根性,侧根发达,适应性强,能耐干瘠土壤,耐旱、耐寒、抗风,对恶劣气候抵抗力强,但低洼积水阴湿地不适生长,木材坚硬耐腐朽,是优良的建筑、电杆、枕木、矿柱等用材.松根含油脂,松针可提取芳香油、单宁、维生素C,花粉可入药,种子含有油,是速生用材树,也是北方荒山造林主要先锋树种,又是树形美丽的园林观赏树种,我国首都北京天安门广场和东西长安街栽植的油松片林和行道树,雄伟壮丽,青翠可观.
Pinus tabulaeformis, evergreen trees, up to 25 meters, diameter 100 cm, bark tortoise cracking, dark gray, brown buds, the leaves are two needles, between the three needles, thick and hard leaves, dark green, brown, Often stay in the tree does not fall, very hi sunshine, deep root, developed lateral roots, strong adaptability, drought-tolerant soil, drought, cold, wind resistance, strong resistance to bad weather, but low water hydrostatic wet discomfort growth , Wood is hard and decay resistant, it is an excellent material for construction, poles, sleepers, pillars, etc. Pine root oil, pine needles can extract aromatic oil, tannin, vitamin C, pollen can be used as medicine, It is also a pioneer tree species afforestation in the barren hills of the north and a beautiful ornamental tree species in tree shape. The pine trees and road trees planted in China’s capital Beijing Tiananmen Square and the Chang’an Avenue in the east and west are magnificent and magnificent.