草地螟越冬代成虫迁飞的气象条件分析

Meteorological Conditions for Migration of Over-winter Loxostege sticticalis Imago

利用内蒙古植保站2009年开展的草地螟(Loxostege sticticalis)越冬代成虫标记放飞、捕获试验结果,对试验期间草地螟迁飞的气象条件进行综合分析。结果表明,草地螟的迁飞过程均对应冷锋的影响过程,850hPa高空图上(低层)具有长距离的暖湿气流,地面冷锋前部的上升气流和850hPa高空图上长距离的西南暖湿输送气流,是草地螟迁飞的主要环流背景条件。迁飞路径上低层气流、适宜的温度及气流的垂直上升运动,均有利于草地螟的飞行运转;回收区产生较大范围和量级的降雨,使其后部强劲的西北下沉气流更为显著,这一时期捕获的草地螟最多。研究结果对了解草地螟的迁飞习性,明确草地螟迁飞的气象条件,并进行早期预警具有重要意义。

Loxostege sticticalis was one of the main migration agricultural pests in North of China.Its migration path which affected by meteorological conditions was very important to accurately forecast.The relationship between meteorological conditions of over-winter imago migration and the results of Loxostege sticticalis mark,release and capture was analyzed by experimented in Inner Mongolia plant protection station.The results showed that the migration of Loxostege sticticalis appeared with cold front,the updraft in front of surface cold front and southeast warm moist air with 850hPa upper-level were the main circulation background.The low-level air,suitable temperature and upward vertical movement were benefit to the migration of Loxostege sticticalis.It was easy to capture the Loxostege sticticalis when a large range and plentiful precipitation caused the strong north-western downdraft occurred in the recovery area.The results are significant to understand Loxostege sticticalis migration habit and meteorological conditions,and make early warning.