【摘要】 为摸清西藏地区行道树资源、现状与特征,应用抽样调查法对该地区的行道树进行调查,分析了西藏行道树多样性指数、结构特征、配置模式等.结果表明:1)西藏常用行道树共计20科36属63种,其平均胸径、平均树高、平均冠幅分别为12.32cm、7.21m、3.90m.从总体上看,行道树规格明显偏小.科属上,应用最多的依次为杨柳科、蔷薇科、松科,分别为15、13、7种. 2)西藏行道树基调树种为白柳、北京杨、紫叶李、榆树、雪松,重要值排前3的依次为白柳、北京杨、紫叶李,其重要值依次为47.830、43.459、22.834,且多样性指数较高.3)季相景观上以"春-秋"季、秋季为主,彩叶树种色系上以黄色、白色系季相景观为主.4)垂直分层结构上以一层模式为主(43.93%),行道树复层结构不发达,花灌木、草花及地被植物较匮乏.更多还原

【Abstract】 To find out the resources, status, and characteristics of street trees in Tibet, the diversity index, structural characteristics, configuration patterns, ect were analyzed based on the survey of street trees in Tibet. The results showed that:1) There are 63 species of street trees in Tibet, belonging to 36 genera and 20 families, and their average DBH, crown, and height are 12.32 cm, 7.21 m, 3.90 m, respectively. In general, their specifications are obviously small. Among all street trees, Salicaceae is the most applied one, including 15 species; Rosaceae and Pinaceae are the second and third most, including 13, 7 species respectively. 2)The key tree species of street trees in Tibet are Salix alba, Populus × beijingensis, Prunus cerasifera f. atropurpurea, Ulmus pumila and Cedrus deodara. In terms of importance value of street trees, the top three are Salix alba(47.830), Populus × beijingensis(43.459), and Prunus cerasifera f. atropurpurea(22.834) and the diversity index is high. 3) Taking account of seasonal phenomena structure, the street trees display mainly spring-autumn aspection and autumn aspection. In terms of the color trees, they are mainly yellow and white. 4) By the vertically layered structure, it is mainly one layer mode(43.93%). The structure of street trees in Tibet are undeveloped and lack of flowering shrubs, flowers and ground cover plants.更多还原