Effects Of Different Arrangement Of Eight Garden Plants On Noise Reduction

With the acceleration of China’s urbanization process,the problem of noise pollution has become more serious.In recent years,research on plant noise reduction has been increasing,but due to various constraints,most of them focus on green belt noise reduction,single plant noise reduction and plant community planting noise reduction.Therefore,the author focus on the effects of different arrangements of single plants on the noise reduction effect.Based on the street survey of common greenland plant arrangement methods,according to the existing conditions and resources of Huang-Fa nursery,8 kinds of garden plants such as Fraxinus chinensis,Syringa oblata,Acer negundo,and Euonymus kiautschovicus are selected.Three types of arrangement are defined as aligned,interlaced,and random.Set a total of 6 planting density gradients from 4 to 24 trees/100 m2.The plant species are planted into plant communities of different arrangement and different planting densities,and the plant community characteristic factors are calculated,and different noise incident angles,different noise heights and different noise receiving point heights are set on each plant community.In order to explore the effects of different arrangements of single plants on the noise reduction effect,the conclusions are as follows(1)the random plant community has the best noise reduction effect,about 40%higher than the interlaced plant community,and about 45%higher than the aligned plant community.(2)The noise reduction effect of plant communities does not increase with the increase of planting density,and each plant has its specific optimal noise reduction planting density.(3)Interlaced plant communities are more likely to have a noise-reducing effect on noise incident at a particular angle.However,the aligned and random plant communities have their specific planting density and noise incidence angle to achieve the best noise reduction effect.(4)The plant community has better noise reduction effect at the measuring point near the ground when the sound source height is lower than 1 m,and the plant community has better noise reduction effect at the measuring point farther from the ground when the sound source height is higher than 1 m;When the noise height and the height of the measuring point are both below lm,the correlation between plant community characteristic factors and noise reduction rate is poor.(5)When the noise height and the measuring point height are both above lm,the correlation between plant community characteristic factors and noise reduction rate is strong.(6)Among the 8 plants tested,Syringa oblata and Populus tomentosa had the best noise reduction effect.