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| Wind and noise reduction effects of natural reed communities along the Beijing-Hangzhou Grand in Huai’an |
| LI Dong-Lin1, ZHANG Wen-Bao2, JIN Ya-Qin3, ZHOU Jun3 |
| (1. Forestry Academy of Jiangsu,211153, Nanjing; 2. Nanjing Binjiang Park Manage Limited Company, 210019,Nanjing;3. Department of Horticulture Jinling Institute of Technology, 210038, Nanjing: China) |
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Abstract As an important part of swamp along riparian zone, reed communities play the vital role in improving slope ecological environment. By Actual investigation and measurement, effects of natural reed communities on wind and noise along the Beijing-Hangzhou Grand in Huai’an were studied. The results showed that wind speed at the lee of communities reduced, noise level decreased evidently in comparison with the control(no reed), the change of wind and noise in one day had some difference too. The effects differed between different reed communities types due to their diversity in density and width. Effects of dense and mid-dense communities on wind were superior to sparse communities, average wind reduction rates of dense and mid-dense communities in one day were 63.95% and 66.25% respectively; and their average noise reduction rates in one day were 9.81% and 6.13% respectively. When air flow and sound wave went through reed communities, an evident weak area of wind and noise were formed among communities, but they showed different change curves after them passed through the communities. The change of wind speed went through reed communities could be described: y= -0.000 5x3 + 0.033 6x2 -0.542 8x+2.741 6(R2 =0.821 6); and the change of sound level went through that could be simulated with equation: y =-0.001 2x3 +0.080 6x2 -1.536 2x+65.09(R2 =0.845 2). The reed communities had obvious reducing effects on wind and noise, which was helpful to sailing, so it is a kind of ecological slope mode which is worth protecting and applying along riparian zone.
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Received: 29 November 2011
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