用2009-2010两年时间对秦岭小蘖分别进行了硬枝扦插和嫩枝扦插的育苗对比实验,结果表明,用吲哚-3丁酸处理的插穗,嫩枝生根率为79％,比硬枝生根率高26％；嫩枝扦插苗1 a即可出圃,出圃时苗高62 cm,嫩枝扦插苗生长迅速,2年生苗平均高度可达203 cm,可大大缩短育苗周期,满足生产、园林绿化需要.

With the rapid development of highly centralized city,urban landscape takes a new look and feature and urban streets are the city's framework,linking the various functional areas of the city.Green plantation design for urban street is the heart of the city streets.This paper analyzed the status and problems of streetscape in the northern cities.A few principles and suggestions were proposed for the decision maker in the landscape green.

樟子松为常绿乔木,树高达30 m,胸径达1m,树冠呈广卵形,叶二针一束,粗硬稍扁,树干通直,材质优良,树姿秀丽,且根系发达,可塑性强,适应性广.是防风固沙,保持水土,美化环境和用材兼优的树种.地处六盘山外围的泾源县是宁夏的生态旅游县,营林生产要求以营造生态景观林为主,樟子松是较为理想的景观树种.樟子松原产在大兴安岭林区、呼仑贝尔盟草原一带的沙土草原上.从六盘山地区和其原产地的气候特点及立地条件相比较,有发展樟子松的潜力.特别是它能耐零下40℃的低温,耐寒、耐旱、适应性强,在多种类型的土壤上均能生长,这些特性给本地引种试验提供了一定的依据.通过苗期阶段和造林以后幼林生长的观察分析和对照,我们认为,樟子松在本地区具有较为广泛适应性,并掌握了苗期和幼林期生产技术措施,现将试验结果简述于后.