摘要
在2007年7～9月江淮稻区稻纵卷叶螟大发生期间,利用多普勒昆虫监测雷达在南京市浦口区对稻纵卷叶螟成虫的迁飞活动进行了监测,结合大气风温场的数值模拟,研究了稻纵卷叶螟成虫的空中飞行参数和种群迁飞动态。结果表明:稻纵卷叶螟多选择在黄昏18:30以后大规模起飞,空中虫群密度在20:00～22:00时最大,迁飞过程可持续到次日5:00;稻纵卷叶螟主要选择在500m以下高度飞行。空中虫群具有聚集成层的现象,虫层多在100～500m高度之间形成,有时形成两个虫层,成层现象与低空急流关系密切,与温度没有直接关系。迁飞过程分析表明,浦口区的六(4)代稻纵卷叶螟在台风、副热带高压和江淮气旋的影响下,先后出现了多次迁入迁出过程。低压系统外围的下沉气流很可能是稻纵卷叶螟两次集中迁入的主要原因。
Doppler Insect Monitoring Radar （DIMR） observations of rice leaf roller Cnaphalocrocis medinalis migration were made at Pukou district of Nanjing from July to September 2007. Radar observations showed that large numbers of rice leaf roller moths migrated from dusk （ 18 ： 00 h） until about 05 ： 00 h the following morning. The maximum aerial density of moths usually appeared between 20：00 and 22：00 every night. The moths mainly flew below 500 m. The majority of the migrating moths on any one night usually aggregated in layers between 100 m and 500 m above ground, and sometimes two moth layers were present simultaneously, one above the other. The stratification of moth density was closely related to the low-level nocturnal jet rather than air temperature. We analyzed the migration dynamics and the temperature and wind profiles on the migration routes by numerical simulation using NCAR re-analysis meteorological data, the DIMR data and field survey data. The results showed that there were four migrations of the 4th generation of the moth in Pukou. （ 1 ） The moths immigrated from the southern area of Jiangsu on the peripheral wind field of a Typhoon on 18 -19 August. （2） A large proportion of the moths in the local area emigrated to regions to the northwest on the low-level jet on the night of 24 August. （ 3 ） Another population immigrated from areas to the southeast of Nanjing on the following night, and （4） in early September, after one cyclone moving into the East China Sea, the rice leaf rollers in Pukou engaged in southwards ＇ return＇ migration on the northeast winds following the cyclone. Results indicated that the two massive immigration peaks of the rice leaf roller on the night of 18 -19 and 25 August were associated with the subsidence around the low pressure system.
出处
《生态学报》
CAS
CSCD
北大核心
2008年第11期5238-5247,共10页
Acta Ecologica Sinica
基金
国家973资助项目(2006CB102007)
国家科技支撑计划资助项目(2006BAD08A01)
水稻产业技术体系资助项目(nyctx-001)~~
关键词
稻纵卷叶螟
多普勒雷达观测
数值模拟
迁飞动态
Cnaphalocrocis medinalis
Doppler Insect Monitoring Radar
numerical, simulation, migration dynamics
