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| Characteristics of heaping sand and initiative research on sand fixation with wind fence on coastal sandy land |
| Zhu Wei |
| Fujian Academy of Forestry,350012,Fuzhou,China |
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Abstract In order to provide scientific reference for desertification combating, it is necessary to study the configuration of wind fence and governance model of sand dunes on coastal sandy land and in the drought conditions. We designed four permeabilities of wind fence (including 15%, 30%, 45% and 60%) on sandy land in drought conditions, and investigated wind velocity variation and heaping sand characteristics in this study. Three kinds of sand-fixing herb, namely Oenothera glazioviana, Ipomoea pes-caprae and Vitex trifolia were selected to stabilize sand dunes. The results indicated that 15% permeability was best fit for setting as sand-heaping wind fence with the highest windproof efficiency reaching 89.23% and the protection distance halving wind speed of 5H (H means the height of wind fence). And windproof efficiencies of 30% and 45% permeabilities were 76.70% and 71.53%, respectively, and could be set up as reducing wind fence after sand-heaping wind fence, and their protection distance that halves wind speed was 6H. The windproof efficiency of 60% permeability was the lowest, 59.47%, and was unsuitable to be set up as wind fence for its weak sand-arresting function and short protection distance. The sand dunes formed by sand-heaping wind fence should be stable over time, and Ipomoea pes-caprae is an optimum pioneer herbaceous plant for fixing sandy at frontier bare sandy land because of its strong survival ability and spreading speed in the southeast coastal areas of Fujian.
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Received: 02 April 2014
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