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2008年2月,我国南方和越南北方普遍遭遇了罕见的低温冻害,褐飞虱Nilaparvata lugens(Stl)与白背飞虱Sogatella furcifera(Horváth)越冬虫量大大减少,而广西北部湾稻区在3—4月却出现了大规模的稻飞虱迁入峰。结合2008年越冬考察、灯下监测以及田间系统调查结果,通过HYSPLIT模型与GrADS软件对此阶段出现的稻飞虱大规模迁入过程进行轨迹模拟与天气学背景分析,得出以下结论:(1)2008年广西早期迁入稻飞虱虫源与越南北部虫源关系不大,主要来自越南中部及老挝南部;(2)850hPa高空温度较高,低空急流频繁,以及过早出现的台风是造成钦州4月份稻飞虱大规模远距离迁入的最主要原因。因此,除越南北部红河三角洲地区外,为我国华南稻区提供早期迁入虫源的越南中部稻区更值得关注。
In February 2008, southern China and northern Vietnam generally experienced rare low-temperature frost damage. The Nilaparvata lugens (Stl) and Sogatella furcifera (Horváth) overwintered the insect populations of the Nilaparvata lugens (Stl) and Siberianlla furcifera (Horváth) April there was a large-scale planthopper immigration peak. Based on the results of overwintering investigation, lamp monitoring and field investigation in 2008, the trajectory simulation and synoptic analysis of large-scale migration of planthoppers during this period were carried out by using HYSPLIT model and GrADS software. The following conclusions were drawn: (1 ) In 2008, the source of rice planthopper migrated to Guangxi in early stage was not related to insect source in northern Vietnam, mainly from central Vietnam and southern Laos. (2) High temperature at 850hPa, frequent low-level jet stream and premature typhoon Qinzhou April large-scale long-term planthopper immigration into the main reason. Therefore, except for the Red River Delta in the northern part of Vietnam, it is deserving more attention for the areas of central Vietnam that provide early migratory insects to southern China.