广东省稻飞虱迁入轨迹及虫源地分析

为了揭示广东省稻飞虱迁入路径和虫源地分布，为其精细化预测预报及源头治理提供科学依据，根据广东省清新县、广州番禺区2010、2011年稻飞虱虫情资料，利用HYSPLIT-4轨迹分析平台和图形处理软件GrADS进行稻飞虱迁入轨迹及虫源地分析。结果表明：稻飞虱发生初见日（迁入）及各高峰日当天、前1天、前2天观测到有降水，下沉气流和降水是迫使稻飞虱集中降落的主要原因；广东省早稻期间稻飞虱主要发生在5月上旬至7月上旬，低空急流、西南气流及偏南气流为稻飞虱迁入广东提供了运载气流，其稻飞虱迁入的虫源地主要分布在越南、老挝南部、海南省及两广南部；广东省晚稻期间稻飞虱主要发生在9月上旬至10月上旬，稻飞虱随偏北气流开始由北往南回迁，稻飞虱迁入的虫源地主要分布在湖南及江西等稻区。

Analysis of Immigration Trajectory and Source Areas of Rice Planthopper in Guangdong Province

In order to determine the immigration trajectory and source areas of rice planthopper in Guangdong Province, and to establish a basis for refined forecasting and source suppression, the geographic distribution of the source area of early immigrant rice planthopper was analyzed by GrADS (Graphics Processing Software), HYSPLIT-4, a trajectory analysis software for the simulation of migration pathways, and light trap catch data from 2 plant protection stations (including Qingxin, Panyu). The results indicated that precipitation was observed the immigrant and peaks days, as well as one day and two days ago. Downward airflow and precipitation were main two reasons of forcing rice planthopper to land focusly. The peaks of early immigrants of rice planthopper were from early May to early July for early-rice growth reason. Lower jet, southwest and south flows provides carrying force for immigrant rice planthopper, and most of the early immigrants came from Vietnam, southern Laos, Hainan Province, southern Guangdong Province and Guangxi Province. The peaks of early immigrants of rice planthopper were from early September to early October for late-rice growth reason. Rice planthopper was back moved from north to south with north flow, and source of immigrant insect was distributed in the rice areas of Hunan and Jiangxi etc.