Abstract: Ten common landscape tree species in Zhengzhou City were selected as research objects, and the simulated fixed noise source （fetal noise） was simulated. The AWA6228 multiple-functional sound level meter was used to measure the noise reduction under different distance gradients, and the canopy structural characteristics including leaf area index （LAI）, mean leaf angle （MLA） and gap fraction （GAP） of the trees were quantified by using the CI-110 to analyze the relationship between the noise reduction ability and the canopy structure characteristics. The results showed that there were differences in the ability of trees to reduce noise under different distance gradients. The LAI index of the canopy of tree communities was positively correlated with the noise reduction ability. The GAP index was negatively correlated with the noise reduction ability. The canopy texture and noise reduction ability were moderately correlated, while the MLA and leaf area were not correlated with the noise reduction ability.

Key words: landscape tree, noise reduction capability, canopy structure, leaf area index, gap fraction, leaf inclination angle