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对中国多年褐飞虱虫情资料进行普查分析后,筛选出两个典型的盛夏北迁大发生过程,引进中尺度动力数值预报模式MM4, 结合天气背景对这些过程的实测气象要素场进行了客观分析和数值模拟。结果表明: (1) 对褐飞虱迁飞有影响的四维气象要素有23 个, 其中起关键作用的为气流场、温场和位势高度场; (2) 有利的天气背景是造成褐飞虱大发生的重要机制之一, 气流场、温场、位势高度场等要素在时空分布上的有效配合对起飞、迁移和降落起了重大的推动作用;(3) 当大气处于强对流不稳定状态时, 如果褐飞虱生理上的主动迁飞需求与气象背景的推动作用呈正向迭加时, 迁飞大发生的条件就成熟了。
After census and analysis of China’s brown planthopper insect information for many years, two typical midsummer migration occurrences were screened out, and the mesoscale dynamic numerical prediction model MM4 was introduced to conduct an objective analysis of the observed meteorological elements of these processes combined with the weather background Numerical Simulation. The results showed that: (1) There were 23 four-dimensional meteorological elements influencing the migration of N. lugens, of which the airflow field, the temperature field and the geopotential height field played key roles; (2) the favorable weather background was caused by the brown planthopper One of the important mechanisms is that the effective cooperation of the air flow field, the temperature field and the geopotential height field in space-time distribution plays a significant role in the takeoff, migration and landing. (3) When the atmosphere is in a strongly convective and unstable state, If the biophysical initiative of the Nilaparvata lugens to take off and the role of the meteorological background to promote the positive superimposed, the migration of conditions occurred to mature.