褐飞虱迁飞的雷达观测与轨迹研究

１９８８年９月下半月，在江苏省江浦县用雷达直接观测了褐飞虱的长距离迁飞过程。观测发现，晚上有大量的褐飞虱飞过雷达观测点。迁飞的褐飞虱绝大多数在傍晚到黄昏时分起飞，然后随气流上升到４００—１０００ｍ的高度。受大陆冷高压东侧东北气流的影响，多数情况下随风朝西南方向飞去。这在生态学上具有十分重要的意义，因为那里可能是褐飞虱的越各地。

Study on Radar Observations and Trajectory of the Autumn Migration of Brown Planthopper

We used radar to observe long-distance migration of brown planthopperat Jiangpu in Jiangsu Province during the second half of September,1988.Brownplanthopper dominated the night-flying aerial fauna during the period of observati-ons. Most migrant brown planthopper took off between late afternoon and dusk,cli-mbed to 400 1000m.Trajectory analysis shows that they are dispersing downwind,mainly to the southwest,where insects migrate in the north-easterly winds blowing on the east or south-east sides of a continental anticyclone.centred over northern central China. This direction is ecologically advantageous at this season because it carries the brown planthopper toward areas where survive the winter is possible