夏冬两季城郊公路绿化带的降噪效果差异分析

在夏冬两季监测柳州市柳长路绿化带的噪声值，分析全乔型、乔灌结合型、全灌型3种标准配置方式的典型绿化带降噪效果季节差异。结果表明：各类型绿化林带对城郊公路的交通噪声都有一定的降噪效果，能达到标准要求，但不同配置方式降噪效果不同；从夏冬两季绿化林带降噪效果分析，整体上夏季的降噪效果强于冬季，全灌木型夏冬季的降噪效果接近，乔灌结合型夏冬季降噪值差值为2.24~3.16 dB，全乔木型差异最明显，夏季降噪量比冬季大3.84 dB；在30 m绿化带范围内，0~10 m处可以得到很稳定的降噪量。

Variation analysis of noise-reduction effect by green belts of suburban road in summer and winter

Through monitoring the noise level alongside the green belts on Liuchang Road in Liuzhou in summer and winter, the differentiations of noise reduction effect among all arbor, arbor+shrub and all shrub have been studied. The results showed that green belts can reduce traffic noise to some extent to meet the standard requirements, but different configurations have different noise reduction effect. In terms of seasons, the effect of noise-reduction in summer is more remarkable than the effect in winter. The arbor+shrub type shows little difference in noise reduction effect. Noise-reduction difference value of the all shrub type is about 2.24 to 3.16 dB in summer and winter. In summer, noise-reduction noise value of the all arbor type is 3.84 dB higher than that in winter. Within the scope of 30 m green belts, noise reduction effect is stable between 0 and 10 m.