论文部分内容阅读
疣枝桦,又名垂枝桦,系新疆天山及阿尔泰山特有物种,属落叶阔叶乔木。生长在海拨1300～2500米的林缘地、疏林地或者混交林中,喜光,对气候、土壤适应性很强,耐寒,能耐极端低温-50℃。是良好的植树造林及城市绿化树种,也可用于公园、行道树,具有较高的观赏价值。疣枝桦种子颗粒小,育苗生长缓慢,播种育苗难度大。一、生物学特性疣枝桦,叶为宽菱状卵形,长1.5～7.0厘米,先端渐尖,基部宽楔形或近圆形,边缘具不规则重锯齿,幼时两面皆密生树脂状腺点并疏生长柔毛,侧脉4～
Warty birch, also known as weeping birch, Department of Tianshan and Altai Mountains of Xinjiang endemic species, is a deciduous broad-leaved trees. Growth in the 1300 ~ 2500 m altitude forest margin, sparse woodland or mixed forest, hi light, climate, soil adaptability, cold, resistant to extreme low temperature -50 ℃. Is a good afforestation and urban afforestation species, can also be used for parks, trees, has a high ornamental value. Wart birch seed particles are small, nursery growth is slow, planting seedling difficult. First, the biological characteristics of wart Birch, leaves a wide diamond-shaped oval, 1.5 to 7.0 cm long, apex acuminate, the base of a wide wedge or nearly circular, with irregular heavy serrated edge, both sides are dense when young resinous gland Points and sparsely growing pilose, lateral veins 4 ~