Landing characteristics of Nilaparvata lugens(Stl)in typhoon | 褐飞虱在台风系统中的降落特征

chinois. 为了揭示褐飞虱在台风影响期间的降落特征,选择了7年中发生在褐飞虱迁飞季节的9个台风,根据逐日灯诱褐飞虱资料、田间候报资料、美国国家环境预报中心/美国国家大气研究中心(NCEP/NCAR)的网格点气象再分析资料及中国地面实测降水资料,利用ArcGIS、GrADS软件对褐飞虱降虫区的气象要素分布特征进行了详细的比较分析。结果表明:1)褐飞虱降虫区随着台风移动路径的变化而变化,不同路径台风气象要素的结构特征对褐飞虱的降落具有决定意义;2)台风系统内的降虫区常位于风向气旋式切变的辐合气流区内,并常有强降水相伴,其中降落的褐飞虱虫量大、局地性强;3)台风外围的降虫区上空多为辐散气流并伴有小雨天气出现,降虫范围广;4)盛夏季节出现的台风会造成褐飞虱混迁现象的出现,由西南风和北风引起的降虫比例很高。

anglais. In order to reveal the landing characteristics of brown planthoppers,Nilaparvata lugens(Stl),as influenced by typhoon,nine typhoons in migration seasons of brown planthoppers(BPH)which occurred in seven years were chosen.Based on the daily light catches and the pentadly field investigations of BPH,the grid reanalyzed meteorological data from NCEP/NCAR and the observed precipitation data in China,in this paper,the characteristics of meteorological factors in the landing areas of BPH were analyzed carefully under the assistance of ArcGIS,a software of geographic information system,and GrADS,a professional meteorological drafting software.The results showed as follows:1)the landing areas of BPH changed with the tracks of typhoon.The structure characteristics of meteorological factors of different typhoon systems could decide the landing of BPH.2)The landing areas of BPH inside typhoon system were often located at wind cyclonic shear,where the airflow convergence existed and it was accompanied with rainfall.The great number of BPH landed in these areas,and the landing range had obvious local pattern.3)There was divergence airflow in the upper levels around the typhoon.Meanwhile the range of the rainfall and BPHs landing was wide there.4)The typhoons could bring about the mixed migration of BPH in midsummer.The possibility of the BPHs landing resulted from the south-west wind or the north wind was very high.