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研究选取五种常见园林绿化树种:油松(Pinus tabulaeformis)、圆柏(Sabina chinensi)、龙爪槐(Sophora japonica Var.pendula)、丁香(Syringa oblate)、红瑞木(Cornus alba)作为研究对象,利用PC-2太阳辐射记录仪测定树木遮阴及全日照条件下UVB辐射强度,计算其UVB屏蔽率,并对五种园林树种UVB屏蔽效应进行初步显著性分析。结果表明:(1)各树种均对UVB产生消减作用,但消减程度有所不同。各树种遮蔽下UVB辐射量最大值均出现在13时左右。(2)各树种遮蔽下的UVB辐射日进程呈现无规律性(3)除圆柏以外,其他园林树种对UVB辐射有明显的消减作用。通过方差分析,五种园林有绿化树种屏蔽效应显著,其屏蔽效应依次为:红瑞木97.9%、丁香80.6%、油松80.5%、龙爪槐53.9%、圆柏43.5%。红瑞木与圆柏差异性最大,达到54.422。油松与丁香差异性最小,为0.878。
Five species of common landscaping trees were selected: Pinus tabulaeformis, Sabina chinensi, Sophora japonica Var.pendula, Syringa oblate and Cornus alba, The UVB screening rate was calculated by shading the shade of trees and UVB radiation under full sunshine by using PC-2 solar radiation recorder. The UVB shielding effects of five species of garden trees were primarily analyzed. The results showed that: (1) All species had a diminishing effect on UVB, but the degree of abatement was different. The maximum UVB radiation intensity of all species occured at about 13 o’clock. (2) The daily process of UVB radiation showed no regularity under the shade of each species. (3) Apart from drupe, the other garden tree species significantly reduced UVB radiation. By means of analysis of variance, the shrub effect of greening trees in five kinds of gardens was significant. The shielding effects were as follows: 97.9% of Hongrui, 80.6% of clove, 80.5% of Pinus tabulaeformis, 53.9% of Longjuhuai and 43.5% of Sabina. Redwood and Sabina the biggest difference, reaching 54.422. The smallest difference between pine and clove was 0.878.