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Effects of species and shelterbelt structure on wind speed reduction in shelter

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Abstract

Live shelterbelts are common elements in coastal land areas and play an important role in reducing wind speed and sand drift. A simple measured index, that well represents relationship between shelterbelt structure and wind speed reduction, is required by landowners to enable them in establishing more effective shelterbelts. A three-dimensional crown (3D) density is proposed, which can be easily identified through shelterbelt parameters including maximum height, shelterbelt width, vertical crown/stem area ratio, and horizontal crown/stem area ratio. The utility of the index was tested in 10-year-old Casuarina equisetifolia and in 7-year-old Acacia auriculiformis shelterbelts in north central Coast of Vietnam. There was a significant negative linear relationship (R 2 = 0.64, p < 0.001) between 3D density and wind speed reduction efficiency, while there was no relationship between a two-dimensional crown density and wind speed reduction efficiency. Reduction efficiency was found to increase at higher wind speeds in shelterbelts of A. auriculiformis, but not C. equisetifolia. The A. auriculiformis shelterbelt was more efficient in reducing wind speed compared to C. equisetifolia shelterbelt. The former recovered 70 % wind speed at 130 m (16.5H) leeward, while it recovered 70 % at 85 m (8H) leeward in C. equisetifolia shelterbelt.

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Acknowledgments

This study was supported by grants-in-aid for scientific research from Vietnam National Foundation for Science & Technology Development (NAFOSTED/106-NN.06-2013.01). The comments from anonymous reviewers were highly appreciated.

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Correspondence to Dang Van Thuyet.

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Van Thuyet, D., Van Do, T., Sato, T. et al. Effects of species and shelterbelt structure on wind speed reduction in shelter. Agroforest Syst 88, 237–244 (2014). https://doi.org/10.1007/s10457-013-9671-4

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  • DOI: https://doi.org/10.1007/s10457-013-9671-4

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