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1、褐飞虱降落机制的个例分析胡高I包云轩I王建强2翟保平/(1.南京农业大学昆虫学系，农业部病虫害监测与治理垂点开放实验室，南京210095；2.全国农业技术推广服务中心病虫测报处，北京100026)摘要：应用MM5小尺度数值模拟模式和GrADS气象图形软件，对1999年6月22R〜7月2H-次褐飞虱迁飞降落过程及其大气背景场进行了个例研究，并侧重对灵川、东至、徽州三个站点的降虫机制做了客观分析。结果表明：(1)此次迁飞过程冇两个明显的降虫区：天柱•灵川•贺县一线范围内(降虫区I)和三都■天柱■黔阳■修水■东至■徽州■奉贤一线(降虫区II)；(
2、2)低空急流为褐飞虱北迁提供了运载气流，降虫区位于降水区边缘；(3)地形降水胁迫害虫降落是降虫区I褐£虱降落的主要原因，梅雨锋降水导致了褐飞虱集中降落在降虫区II;(4)虫源的空间分布差异和不同的天气条件导致了东至、徽州地区不同的降虫分布。关键词：褐飞虱；降落；梅雨锋；地形胁迫CaseStudiesontheLandingMechanismsoftheBrownPlanthoppersNilaparvataLugens(Stal)HUGao、BAOYun-Xuan,WangJian-qiang,ZHAIBao-Ping{X.KeyLabor
3、atoryofMonitoringandManagementofPlantDiseasesandInsectPests,theMinistryofAgriculture,NanjingAgriculturalUniversity,Nanjing210095,China.2.DivisionofPestForecasting,NATESC,Beijing100026,China)Abstract:Thelandingmechanismsofbrownplanthoppers,Nilaparvatalugens(Stal)(BPH)werest
4、udiedusingGIS(GeographicInformationSystem),MM5(TheFifth-GenerationMesoscaleModel)andGrADS(GridAnalysisandDisplaySystem)syntheticallytoanalyzegeographicdistributionpatternsofimmigratedpopulationsofBPHandtheatmosphericbackgroundsthatinfluencedthelandingprocesses.Duringthemom
5、entousrainfallprocessfromJune22toJuly2ini999,atypicalmigrationprocessofBPHoccurredinthesouthernChina.Thespatio-temporaldistributionsoftheimmigrationpeaksofBPHwereanalyzedusingthedataoflighttrapcatchesandfieldsurvey.Inaddition,wcanalyzedtheatmosphericbackgroundsduringtheBPH
6、immigration,i.e.9thewindbornstreams,thecirculationsituations,theweatherconditions,andthetopographiesinfluencedtheimmigrations,etc.ThelandingmechanismsofBPHatLingchuan,DongzhiandHuizhouwerecomparedbasedontopography,precipitation,subsidingairflowetc.Thecorrelationsbetweenthe
7、populationdensitiesofBPHatsourceareasandlandingareaswereanalyzedbyusingHYSPLIT,atrajectoryanalysissoftware・Weobtainedthefollowingresults:(1)BPHlandedobviouslyonthetwoareasinthestudiedcases:i.c.LandingareaIisalongTianzhu(GuizhouProvince),Lingchuan(GuangxiAutonomousRegion)an
8、dHexian(GuangxiAutonomousRegion);andLandingareaIIisalongSandu基金项目：国家973项目(2006CB102007),国
