关键词: 草地螟, 迁飞和降落, 东北冷涡, 预警

Abstract:

Based on a migration and capture experiment of marked adults of Loxostege sticticals (Ls) in plant protect station of Inner Mongolia autonomous region on June of 2009, relationship between mark-release-recapture (MRR) of overwinter-generation adults and weather system was analyzed by using information from daily upper synoptic maps (500-1000 hPa isobaric surface maps at 08:00 and 20:00 on June of 2009) and surface synoptic maps with 8 times per day. The results indicate that adults of Ls are involved into northeast cold vortices and fly with air flow along anticlockwise direction in control region after they are released, and their migration direction is close related to weather system. Meteorological factors such as airflow direction, precipitation and wind-speed significantly influence migration and landing of Ls adults. Analysis of both relationships is favorable to understand migratory habits of Ls at the age of fulminant period, while analysis of meteorological conditions of Ls active landing and moving and corresponding early warning index plays an important role in the process of monitoring migration of Ls adults.

Key words: Loxostegy sticticalis (Ls), Migration and landing, Northeast cold vortex, Early warming