两种仿真固沙灌木防风效应的野外观测

Field Investigation on Wind Preventing Effect of Two Simulated Shrub

仿照沙旱生灌木构型制成无叶和有叶两种仿真固沙灌木,在野外观测了这两种仿真固沙灌木对风速变化的影响。结果表明,当风速为2.2~5.5m/s时,40cm高度的仿真固沙灌木削弱风速率随风速增大而增加。仿真固沙灌木平均风速削减率小于沙蒿,但统计分析差异不显著。无叶仿真固沙灌木平均降低风速率小于有叶仿真固沙灌木。仿真固沙灌木是结合多种植物优势组合而成,是对植物治沙措施的优化,具有显著的防风效应。

The two types of simulated sand-fixing shrub such as no-leaf-shrubs and leaf-shrubs were made up according to sand xeric shrubs configuration, and their effects on change of wind velocity was observed in ourdoor. The results showed that the reducing ratio of wind velocity increased with the increase wind velocity at the height of 40 cm with wind velocity of 2.2~5.5 m/s. The ratio of reducing wind velocity of the simulated shrubs was less than that of Artemisia arenaria, but not statistical significance. The ratio of reducing wind velocity of simulated leaf-shrubs was bigger than simulated no-leaf-shrubs. Simulated sand-fixing shrub has the remarkable function to control wind velocity because it is combined with the advantage of various vegetation, it is a optimized vegetation measure for controlling sand.