以公路两侧具代表性植被类型样地为主要研究对象，研究结果表明，乔灌混交林对交通噪声的衰减效果比乔木纯林的效果更好；林带对交通噪声的衰减作用随距离的增加而增加，绿化带对噪声的总衰减量每10,m 的增量约为3,dB，绿化带愈量衰减每10,m 的增量约为1,dB；林带对噪声的衰减作用与林带的能见度成反比，该研究数据证明，当林带的能见度在20,m以下时，具有比较理想的降噪效果。%In this paper,sample plots with representative vegetation types on road sides were taken as the main object of the study.The results showed that green belts composing of trees and shrubs have better noise attenuation effect compared with those only composing of trees;the role of forest on traffic noise attenuation enhances with the distance,with a total noise attenuation amount of 3,dB per incremental 10,meters and an excess attenuation of 1,dB per 10,meters;the role of forest on noise attenuation varies inversely with its visibility,and the research data showedthat when the visibility of forest is below 20,meters,the noise reduction effect is ideal.
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