银川市几种针叶绿化树种的春季滞春季滞尘能力比较

对银川市西夏区的四个针叶树种在三个不同粉尘污染区的春季滞尘能力进行测定与分析，结果表明：各树种在不同的粉尘污染区均表现出明显的滞尘效应；不同树种的滞尘能力存在明显差异；树种的滞尘能力与降尘环境、滞尘时间等因素有关；随着时间的延长，四树种在不同的粉尘污染区的滞尘能力呈增大趋势；几种针叶树种的滞尘能力由强到弱的顺序为：侧柏〉白皮松〉桧柏〉云杉。

Comparison of Spring Dust Holding of Several Conifer Species in Yinchuan

The ability of dust holding in spring season of 4 conifer species grown in 3 different sites of dust pollution in Yinchuan were measured and analyzed. All the species displayed evident dust holding in all sites and significant differences were found in dust holding ability among the species. The dust holding ability is related to the environmental conditions and the duration of dust holding. As the duration of dust holding extended, the dust holding ability tended to increase in all the dust pollution sites. The quantity of dust holding was larger in Tongxin South Street than in Renmin square. The order of dust holding ability of the conifer species from strong to weak was： Platycladus orientalis〉 Pinus bungeana〉 Sabina chinensis〉 Picea asperata.