Abstract
Noise pollution is exacerbated by the rapid urban development. Noise has a serious impact on both people's life and cities' ecological environment. Noise should be controlled immediately. Plants are one of the natural noise-reducing materials, which becomes increasingly important and popular. In urban landscape design, it is very important to select the plant species which have good noise reduction effect. The aim of this paper is to find out the characteristics of the plants with good noise reduction effect and apply it in urban landscape design. In this study, an experiment of sound attenuation by plants focusing on leaf vibration is carried out. This study investigates the vibration of leaves of 6 plant species in a sound field using a Keyence (IG- 1000/CCD) Laser Micrometre. The results show that the vibration amplitudes of plant leaves increase significantly by about 4-12 μm after being stimulated by sound. In addition, driven by the same sound, the amplitudes of all leaves varied with the difference of leaf thickness, leaf area and leaf mass. The amplitudes of all leaves increase with the increase of leaf area and leaf mass, while decrease with the increase of leaf thickness.
Highlights
With the rapid development of urbanization, city gray infrastructure has increased significantly, and urban green space has become less and less
The amplitudes of all leaves increase with the increase of leaf area and leaf mass, while decrease with the increase of leaf thickness
Further analysis of these factors shows that plant leaf mass, area and thickness are the main factors that affect the increase of plant leaf amplitude
Summary
With the rapid development of urbanization, city gray infrastructure has increased significantly, and urban green space has become less and less. This triggers a series of rapid urbanization problems: the urban ecological environment is severely damaged, the various environmental elements necessary for people's well-being are seriously polluted and destroyed, resulting in the deterioration of people's life quality [1]. Urban green space can be used as a sound barrier to control traffic noise. By using plants to attenuate traffic noise, traffic noise can be effectively controlled and urban ecological environment can be improved. It is very important to select the plant species with good noise reduction effect for the sustainable development of urban ecology
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