风洞内粘虫飞翔行为与气流的关系

利用自制的昆虫飞翔实验风洞 ,系统观测了在风洞条件下粘虫在不同流速实验气流中的起飞行为与飞翔行为。结果表明 ,微风能刺激粘虫起飞 ,试虫表现明显的偏爱迎风 (或稍偏一点角度 )起飞的习性 ,飞翔时亦多采取迎风 (或稍偏一点角度 )的姿势。试虫在气流中的实际位移是昆虫飞翔位移与气流位移的矢量和。当气流速度小于 2 m/ s时 ,逆风向位移占多数 ;而气流速度为 3～ 4 m/ s时 ,94 .8%的试虫为顺风向位移。

Flight behavior of the moths of Mythimna separata (Walker) in wind tunnel

In wind tunnel for insect flight experiments, the flight behavior of the moths of Mythimna separata (Walker) was observed systematically under wind flow of different speeds. Results showed that breeze could stimulate the moths to take off. The moths tend to taking off upwind, or at a little angle with the wind flow. In flying, most of them had upwind posture too. The displacement of the moths in wind flow was the vector\|sum of their flight displacement and wind displacement. When the wind speed was less than 2 m/s, more moths had upwind displacement, but when the wind speed was between 3-4 m/s, 94 8 percent of the moths had downwind displacement.