【摘要】 对2009年云南省江城、金平、西畴、师宗、彝良5个站点4—5月出现的白背飞虱灯下高峰日进行轨迹分析,并结合部分田间调查数据、峰期对应的大气环流背景、峰日风温场等气象因子,明确2009年云南白背飞虱早期迁入种群的虫源地范围和降落机制。研究结果表明:(1)2009年云南4—5月份前期迁入飞虱虫源主要来自缅甸,部分虫源来自老挝与越南,极少数虫源来自印度东部因帕尔地区。(2)低温屏障、风场切变以及垂直气流扰动是造成白背飞虱集中降落的最主要气象因子。(3)缅甸虫源区偏西气流盛行以及冬春稻种植面积扩大而导致的虫源基数增加是造成2009年云南白背飞虱大量迁入的根本原因。更多还原

【Abstract】 From April to May,2009,the research on source areas of early immigration of white-backed planthoppers(WBPH) Sogatella furcifera(Horváth) were conducted at five research stations located at five different areas in Yunnan province.Based on the analysis on the daily light-trap catches,field surveys,immigration trajectory simulation and meteorological background,the following conclusions can be drawn:(1) The main source areas of the early immigration of WBPH in 2009 were located in Myanmar,and the secondary source areas were at the Laos and Vietnam,and very few came from Imphal of India.(2) The low temperature shield of surrounding to flying WBPH and the wind shear associated with heavy precipitation were the key factors to affect the concentrated landing of WBPH.(3) The high frequency of westerly wind and the great increasing of rice planting in the source areas of Myanmar were the principal reasons that caused the mass immigration of WBPH to Yunnan in 2009.更多还原