Abstract
The effects of noise attenuation among bare land, grassland, dominated broad-leaved (Quercus acutissima Carruth) and dominated coniferous forest (Pignus rigid Mill.) were studied For this study, the field experiment was carried out at playground, orchard grass, and school forest in Yeungnam University, Kyongsan. Sound levels of 500, 630, 800, 1,000, 1,250, 1,600, 2,000, 2,500 and 3,150 Hz, respectively, were projected into the vegetation, and the transmitted levels of sound were recorded at the distances of 1, 5, 10, 20, 30 and 50m, respectively, from the sound source. Both dominated coniferous forest (Pignus riged Mill.) and broad-leaved forest (Quercus acutissima Carruth ) are the more effective than grassland in the rates of attenuation. It is expected that dominated coniferous forest will be the more effective to attenuate sound love교 than dominated broad-leaved forest. In the low frequencies such as 500 and 630 Hz, grassland showed the more effective to attenuate sound levels than forests, while in the high frequency such as 3,150 Hz, the forests are the more effective to attenuate sound levels than grassland The present results suggested that it is the more effective to establish the tree belt for a sound barrier, with dominated coniferous tree species in the upper layer and herbaceous vegetation in the lower layer.