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2008年5月下旬—6月中旬,桂北地区出现了褐飞虱Nilaparvata lugens(Stl)和白背飞虱Sogatella furcifera(Horváth)特大迁入峰,单晚单灯虫量超百万。如此大量的迁入虫源究竟来自何方?利用HYSPLIT轨迹分析平台、地理信息系统ArcGIS和气象图形软件GrADS,对稻飞虱的特大迁入峰及其大气背景场的个例分析表明:(1)西南方向的低空急流为广西稻飞虱大规模迁入提供了运载气流,降雨是迫使稻飞虱集中降落的主要原因;(2)5月下旬,虫源地主要分布在越南北部地区(20°～22°N),6月上旬,虫源地主要分布在越南东北部地区(21°～23°N),6月中旬桂西北地区大规模迁入的虫源地位于越南东北部、广西西南部,桂东北虫源地分布在广西东南部;(3)虫源地的空间分布和虫源基数的差异直接导致了6月中旬桂东北和桂西北地区降虫量的巨大差异。
From late May to mid-June 2008, the Nilaparvata lugens (Stl) and Sogatella furcifera (Horváth) of the Nilaparvata lugens (Stl) and Sogatella furcifera (Horváth) migrated to the northwestern part of Guangxi. With the help of HYSPLIT trajectory analysis platform, geographic information system ArcGIS and weather graphics software GrADS, a case study of the large migration peak of the planthopper and its atmospheric background field shows that: (1) Low-level jet stream in the southwest of China provided the carrier air for the large-scale migration of planthoppers in Guangxi. Rainfall was the main reason for the forced landing of planthoppers. (2) In late May, the insect pests mainly distributed in the northern part of Vietnam (20 ° ~ 22 ° N). In early June, the source areas were mainly distributed in the northeast of Vietnam (21 ° ~ 23 ° N). In mid-June, the source of large-scale migrations in northwestern Guangxi was located in the northeast of Vietnam and southwest of Guangxi Ministry of East China and the northeast Guangxi were distributed in the southeastern Guangxi. (3) The spatial distribution of the insect locality and the difference of the insect-derived base directly led to the huge difference in the amount of pest insects in northeast Guangxi and western Guangxi in mid-June.