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1.20-metre forest belt combining arbor with bush can reduce 5.4 dB noise when such forest belt is planted on the leaning slope beside highway. The width of forest belt is direct proportion to the effect on noise reduction.
乔灌木结合的20m绿化防护带种植在高速公路内低外高的弧形曲面上减噪效果最高可达5.4dB，绿化防护林带宽度与减噪效果呈显著正相关。收藏指正
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