影响黄脊竹蝗迁飞扩散因素调查分析

Factors affecting the migration and dispersion of Ceracris kiangsu

2010—2011年,每年于桃江县马迹塘镇和安化县敷溪镇设立漏治产卵地样地20个,调查立地条件、虫口密度、气候条件对黄脊竹蝗迁飞扩散的影响。结果表明:黄脊竹蝗在陡坡地段向山脚迁飞扩散的速度快于山脊方向,缓坡地段则2个方向差距相对较小;虫口密度大的样地,向四周扩散速度快于虫口密度小的;久雨时向山腰、山脊迁飞扩散快,久晴则向山腰、山脚迁飞扩散快;大风可使黄脊竹蝗的迁飞距离更远,1次迁飞可达250 m以上。

From 2010 to 2011,20 sample plots were set up in Taojiang County and Anhua County. Effects of site condition, popula- tion density and climatic condition on the migration and dispersion of Ceracris kiangsu were researched in the plots. The results showed that, the migration and dispersion speed of Ceracris kiangsu toward the foot of mountain was faster than that toward the ridge of moun- tain on steep slope, but there was no difference between them on gradual slope. The dispersion speed at high population density was faster than that at low population density. At the time of prolonged rain, the speed of migration and dispersion toward the mountainside and the ridge was fast, but at the time of prolonged sun, the speed toward the mountainside and the foot was fast. The strong wind caused farther migration distance, and the migration distance for once was more than 250 m.