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粘虫Mythimna separata是我国农业生产上的重要害虫,为了明确其季节性迁飞行为参数,本研究采用垂直监测昆虫雷达(vertical-looking radar,VLR)及相关辅助设备的长期自动观测,结合基于GIS的大区环流和轨迹模拟,调查分析了2005年东北地区粘虫季节性迁飞行为。结果表明:粘虫在不同季节和夜间不同时间空中飞行高度具有明显差异,空中飞行行为受气象条件尤其是空中风场影响较大;春季和秋季主要借助气流运载进行大规模长距离迁飞,夜间持续飞行时间可达9 h,多数个体能完成整夜飞行,春季迁飞高度主要在300~600 m,秋季飞行高度相对较低主要在300 m以下和400~500 m。夏季雷达回波有明显的成层现象,最高可达1 000 m,主要集中在500 m和700 m两个高度层。轨迹分析显示:5月29日由山东潍坊、临沂等虫源地起飞的黏虫,顺西南气流越海迁飞,6月1日在气旋天气影响下,在吉林省白城等地降落;7月中旬主要为当地黏虫受对流天气影响进行短距离迁飞扩散;9月11日虫源来自内蒙古呼伦贝尔,顺西北气流向吉林省东南方向迁飞。研究结果为东北地区粘虫的有效防控提供了技术支撑。
Mythimna separata is an important pest of agricultural production in our country. In order to clarify its seasonal migration parameters, this study used long-term automatic observation of vertical-looking radar (VLR) and related auxiliary equipment, Of the regional circulation and trajectory simulation to investigate the seasonal migration of armyworm in northeast China in 2005. The results showed that there were significant differences in the flight altitude of armyworms between different seasons and at different times of the night. The flight behavior of the armyworms was significantly affected by the weather conditions, especially the windy field. In spring and autumn, large-scale long- The sustained flight time can reach 9 h, most of the individuals can complete the overnight flight. The height of spring flight is mainly 300-600 m. The flight altitude of autumn is relatively low mainly below 300 m and 400-500 m. Summer radar echoes have obvious stratification, up to 1 000 m, mainly concentrated in two layers of 500 m and 700 m. Trajectory analysis showed that on May 29, the armyworms taking off from the Weifang, Linyi and other insect sources in Shandong Province migrated across the sea along the southwest airstream and landed in Baicheng, Jilin Province on June 1 under the influence of cyclone weather. In July In mid-August, the insects mainly came from Hulunbeier, Inner Mongolia, and moved along the northwest airstream toward the southeast of Jilin Province. The results provide technical support for the effective prevention and control of armyworm in northeast China.