我国北方稻区1991年稻飞虱大发生虫源形成

北方稻区在一般年份只有少量稻飞虱（褐飞虱Nilaparvata lugens,白背飞虱Sogatella fercifera)迁入，而与虫源区相隔千余公里的沿渤海湾稻区却在1991年稻飞虱暴发成灾，通过分析1991年各地稻飞虱主要迁入峰期的天气学背景和低空急流的时空分布及我国东部稻作区各地虫源的对应关系，表明大尺度低空急流的时空动态与南方（江岭区）大发生虫源的迁出期（区）相吻合的程度及维持时间乃北方稻虱大发生虫源得以形成的关键因子和暴发成灾的触发机制，其北上前缘左侧的暴雨区即远迁种群的集中降虫区，是否存在与南方大发生虫源时空同步且贯通南北的大尺度低空急流及其前缘的暴雨区可作为北方稻虱暴发的预警指标。

Immigration of the 1991 Outbreak Populations of Rice Planthopper (Nilaparvata lugens and Sogatella fercifera) into Northern China

During most years,there are only very small immigration of rice planthoppers (Nilaparvata lugens and Sogatella fercifera ) into the rice planting areas in northern China.with and no direct causality between the outbreaks of rice planthoppers in southern and northern China.But in 1991,huge populations of rice planthopper arrived at the coast of Bohai Sea,which is 1500 km from the planthopper source area.What carries such large populations outside their normal areas? Where and how did the outbreak popu...