摘要
[目的]研究海南东寨港海桑＋无瓣海桑红树林生态系统防风效应。[方法]采用自动气象站对海南东寨港海桑＋无瓣海桑典型人工红树林生态系统的防风效应进行定位观测。[结果]在5min尺度上，平均风速依次为：林后IH（H为平均树高）〈林后4H〈林前1H〈林前4H，林后风速大幅度削减，防风效果明显。旱季和雨季频率最高的风向分别是NNE、NE，林后1H对NNE、NE风的减弱程度较大，分别为34．70％、62．99％。林后1H处不同风速的减弱系数G雨季均远远大于旱季。旱季和雨季半小时平均风速进程均呈“单峰”变化，白昼半小时平均风速远远大于夜晚，白昼半小时平均风速变化急剧，夜晚变化缓慢。5rain风速尺度上，林前1H风速与林前4H风速相关性最好。林前1H处与林后1H处风速正常情况下消减幅度为65．35％～77．21％，而热带风暴期间消减幅度为33．29％～53．21％。[结论】为最合理的红树林造林结构和造林位置提供了理论支持和技术指导。
[ Objective ] The effect of the ecological system of Sonneratia apetala-S, caseolaris at Dongzhai Harbor of Hainan Island on the wind- prevention was researched. [ Method] The location observation of the effect of the typical artificial mangrove ecosystem on the wind-prevention was conducted with automatic weather station. [ Results] The results showed that at the scale of 5rain, the order of average wind speed was as follows：the back forest at 1H（H：the average tree height） 〈 the back forest at 4H 〈 the front forest at 1H 〈 the front forest at 4H; and the wind speed was significantly reduced after its passing through the forest. The most frequency of wind direction in dry season is NNE while it was NE in rainy season. The reducing effects of the back forest at 1H for the NNE wind and NE wind reached a high level,with 34.70% and 62.99% , respectively. The C0,the coefficient of wind speed-weakening,in the different wind speeds at the back forest at 1H in rainy season was much larger than in dry season. There was single peak in the wind speed of half hour in rainy season and the average wind speed and variation of half hour in day time was larger and heavier than in night time. At the scale of 5min,there was good relation in wind speed of the front forest between at 1H and 4H and the reduction of wind speed in the front forest and the back forest at 1H was 65.35 % - 77.21% in normal situation and 33.29% -53.21% in tropical storm time. [ Conclusion ] The theoretic supporting and technical guidance for the most optimal construction of the ecological system of mangrove forest and its location was provided.
出处
《安徽农业科学》
CAS
北大核心
2009年第26期12776-12781,12784,共7页
Journal of Anhui Agricultural Sciences
基金
国家科技部社会公益专项(2005DIB3J137)
"十一五"国家科技支撑计划专题(2006BAD03A1402)
国家林业局"948"引进项目(2006-4-34)
海南大学博士启动基金项目(Rndy0703)
关键词
红树林
风速
减弱系数
防风效能
热带风暴
Mangroves
Wind speed
Coefficient of wind speedrweakening
Wind-prevention
Tropical storm
