四川叙永白背飞虱早期迁入种群虫源地分布与降落机制研究

Source Area and Landing Mechanism of Early Immigration Population of Whitebacked Planthoppers in Xuyong,Sichuan Province

根据灯诱虫情,运用大气质点轨迹分析平台HYSPLIT4.8对1991-2012年四川省叙永县白背飞虱主要迁入高峰日进行轨迹模拟,并运用气象图形处理软件Grads对白背飞虱主要迁入高峰日进行气象背景分析。结果表明,四川叙永白背飞虱主要在5-7月迁入。5月份,白背飞虱迁入峰次较少,虫源主要来自云南西南部,云南中部地区、缅甸北部和越南北部也可提供部分虫源;6月份和7月份,叙永上空偏南气流频次逐渐增多,白背飞虱迁入峰次也相对增加。6月份虫源主要来自云南东部和南部地区,广西西北部、缅甸北部以及云南中部地区也能够提供少量的虫源;7月份虫源主要来自云南东北部、贵州西南部和云贵交界处,另外,云南中部和广西西北部也可提供部分虫源。降水、气流的垂直运动和风向切变是造成白背飞虱在叙永大规模集中降落的主要气象因子。

According to the daily light-trap catches of Xuyong,Sichuan Province from 1 99 1 to 2012,we analyzed the trajectory simulation and meteorological background of immigration peaks of white-backed planthoppers [Sogatella furcifera （Horv＆#225;th）,WBPH]by HYSPLIT 4.8（Hybrid Single-Particle Lagrangian Integrated Trajectory）and GRADS （Grid Analysis and Display System）.The results showed that the main immigration times of WBPH in Xuyong, Sichuan Province were from May to July.The immigration peaks were few in May.The source areas were mainly located in the southwest of Yunnan,and the secondary source areas were at the central region of Yunnan,the north of Myanmar and Vietnam.From June to July,with The south airflow prevailing in Xuyong,the immigration times was increased.The mass immigration of WBPH into Xuyong during June was from the east and the south of Yunnan,and some immigrants from the northwest of Guangxi,the north of Myanmar,and the central part of Yunnan.In July,the northeast of Yunnan,the southwestern Guizhou and the border of Yunnan-Guizhou were the major source areas,and the secondary source areas were the central region of Yunnan and the northwest of Guangxi.Based on the analysis on the meteorological background and rainfall distribution,it was found that the rainfall,the vertical movement of airflow and the wind shear caused mass descent of WBPH into Xuyong.