沙蓬防风阻沙效能初步研究

Preliminary Study on the Efficiency of Wind Prevention and Sand Resistance of Agriophyllum squarrosum(L)Moq

选取了延庆县官厅湖畔的沙蓬试验地为研究对象,对沙蓬试验地的粗糙度、防风效能、输沙量、起沙风速及单株沙蓬的阻截沙范围进行的系统的观测和研究。结果表明,沙蓬试验地的粗糙度为6.17 cm,比迎风面空旷沙地高出5.37 cm;其防风效能在30 cm和50 cm高度处较好,分别为24.13%和17.07%,当高度达到200 cm时,已几乎没有防风效能;当风速达到7.1 m/s时,沙蓬试验地仍未见起沙现象;20 m in时段内平均风速为5.8 m/s时,沙蓬试验地的积沙量仅为0.62 g;单株沙蓬的阻截沙范围为1.37 m2。

The Agriophyllum squarrosum（L）Moq, experimental plot in Guanting lakefront of Yanqing county was taken as investigation subject,based on the observations and investigations on roughness,effective function of wind prevention,amount of sediment transport,blown wind speed and single Agriophyllum squarrosum＇s sand resistance range. The result shows that the roughness of experimental plot is 6. 17 cm,which is higher than clear sand land in windward slope with 5. 37 cm;the effective function of wind prevention at the height of 30 cm and 50 cm is better,with the percentage separately is 24. 13% and 17. 07% and at the height of 200 cm nearly has no effective function of wind prevention;wben the wind speed up to 7.1 m/s, the experimental plot still has no sand blown phenomenon;the average wind speed is 5.8 m/s in 20 min ,the sand accumulation in the experimental plot is only 0. 62 g;rhe single Agriophyllum squarrosum＇s sand resistance range is 1.37 m^2.