福建褐稻虱迁飞降落大气环流类型研究

ON THE ATMOSPHERIC CIRCULATION CONDITIONS ASSOCIATED WITH THE MIGRATION AND ALIGHTING OF BROWN PLANTHOPPER IN FUJIAN PROVINCE

据福建省农业厅1975～1992年19个植保站峰迁资料配合大气环流形势,分析褐稻虱迁飞运行和降落的气象特征。春季该省850hpa高空常受切变线南侧和副热带高压(下简称副高)脊线西北侧的西南气流影响,中南亚和海南岛等地褐稻虱主要是伴随降雨和下沉气流降落,表现为北迁。夏季850hpa高空常受副高脊线西北部的西南气流影响,夏末又有高压东侧的东北气流影响,褐稻虱主要亦是伴随降雨和下沉气流降落,此季北迁仍为主流,夏末也有部分南迁。秋季850hpa高空常受高压东或东南侧的东北气流影响,褐稻虱主要是伴随下沉气流和降雨降落,南迁为主流,但也偶有部分褐稻虱随西南风迁入该省,表现为北迁。

Based on the analyses of relationships between the peak migration day of brown planthopper (BPH) Nilaparvata lugens (Stal), data from 19 plant protection stations in Fujian Province, and the simultaneous atmospheric circulation situations, the meteorological features associated with the migration and alighting progressions of BPH in Fujian were determined as follows: (1) All the high altitude airflow bearing BPH populations descend with precipitation and sinking flow. (2) In spring, the high altitude at 850 hpa in this province is frequently affected by southwest flow from south side of wedge line and northwest side of Subtropical High ridge, the BPH sources from Middle South Asia and Hainan Island, etc. mainly migrate northward. (3) In summer, the high altitude at 850 hpa is always affected by southwest flow from northwest side of Subtropical High ridge, and also northeast flow from east side of the anticyclone in late summer, so the BPH populations migrate northward mainly, but also some of them migrate southward later. (4) In autumn, the altitude at 850 hpa is always affected by northeast flow from east or southeast sides of the anticyclone, the BPH population migrate mainly southward, but still a number of BPH migrate northward accidentally into this province with southwest wind.