带状白沙蒿防风效果模拟试验研究

A SIMULATIVE EXPERIMENTAL STUDY ON THE WINDBREAK EFFECT OF ZONAL ARTEMISIA Sphaerocephala

以白沙蒿作为实验材料,通过野外实地试验模拟研究不同带状配置白沙蒿对近地表风速的影响。研究结果表明:株间距为0.5m和1m带状配置防风效果较好,对林带后1H～3H处降低风速的效果明显,0.1m高度处防风效能均能达到40%以上,株间距2m防护效果则较差。两带的防风效果要优于单带1,0cm处平均防风效能分别增加3.33%、10.16%3、.14%。不同配置最小风速均出现在林后1H处,在林后1H～4H范围内能够形成一个相对明显的弱风区,减风效果较好。行距不同能影响防风效果,但一定范围内变化不明显。通过回归方程得出,林带的主要影响因子为株间距,同时随着高度的增加,其防风效能下降明显。

Using Artemisia sphaerocephala as experimental material,study the impact of different belt configuration on near-surface wind through field experimental simulation.The results indicate that： windbreak effect of the belts with plant spacing of 0.5 m and 1 m is better,the effects of wind speed reducing after 1H^3H is significant,which can reach 40% at the height of 0.1 m,while protective effect of plant spacing of 2m is poorer.Windbreak effect of two bands is better than single belt,the average windbreak effectiveness at 10cm place increase 3.33%,10.16%,3.14% respectively.The minimum wind speed of different configurations all appear at 1H place,and a relatively weak wind zone could be formed behind the belts,which ranges from 1H to 4H.Different spacing can affect windbreak effect,but could not change the effect significantly within a certain range.The main factors affecting wind reducing of belts is the plant spacing by means of regression analysis,while with the increase of height,the windbreak efficiency decreased significantly.