The differences in the mean sound pressure level resulted from the application of plants with different foliage types while the control group represented the relative attenuation value.
The results were subtracted from the former attenuation values in order to obtain the relative attenuation caused by the foliage.
We used noise average relative attenuation [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII.
The density was positively correlated with relative attenuation, regardless of the shape of the plants' leaves.
The leaf tactilities of arrowwood (Viburnum odoratissimum), Red Robin Photinia (Photiniafraseri), and Chinese Photinia (Photinia serrulata) are positively correlated to their average relative attenuation values.