INFLUENCE OF THE ASIAN SUMMER MONSOON ON THE MIGRATION PHENOLOGY AND POPULATION DYNAMICS OF NILAPARVATA LUGENS (ST?L) IN CHINA

With the aim to examine variations in the migration phenology and population of N. lugens along with the advance/retreat of the Asian summer monsoon(ASM) and lay the foundation for further study on predicting the timing and location of N. lugens outbreak, correlation analysis and spatial analysis were applied for estimating the impact of the ASM and its related meteorological factors on the migration phenology and population of N. lugens in China in this paper. The ASM had a positive effect on the occurrence and outbreak of N. lugens. First, the first appearance date of N.lugens was consistent with seasonal advances of the northernmost location of the ASM, and the ASM provided the dynamic condition for the northward migration of N. lugens. Second, outbreak of N. lugens occurred in the area under the control of the ASM, and the ASM provided the survival condition for the population of N. lugens. Third, the population was positively related to the northernmost location of the ASM, θ_E(850 hPa) and wind speed(850 hPa).Particularly, the stronger southwest wind caused the date of the first, peak and last catches of N. lugens to turn up earlier than in the extremely years.     

贵州人影作业空域申报自动化系统应用效果分析

近年来,针对日益繁忙的空中交通与不断增长的人影作业需求的矛盾,研制开发了贵州省空域自动化系统,为进一步了解系统在实际人影作业中的应用情况及效果,利用2014-2020年全省人影地面作业数据及全国人工影响天气作业信息上报等资料,对使用系统前后的地面人影申报与批复流程、作业情况、空域申请及批复耗时等进行对比分析,结果表明:(1)简化了业务流程,使用系统后一个申请批复流程从以往的至少需打8个电话缩短至2个,平均每个作业点批复耗时减少1.5 min,年均有效批复率较使用系统前提高2.8%,新型的扁平式管理,减少了管理层级,提高了业务效率。(2)系统投入使用后高炮年均作业次数较使用系统前增长20%,火箭年均作业次数较使用系统前增长82%,且年均获得作业时长较使用系统前增长37%,在实现人影作业多点同时申请与批复的同时,解决了电话占线等问题,提高了作业及时申请的成功率。(3)提高作业信息上传准确率,使用系统后年均人影地面作业信息上报及时率较使用系统前提高2.3%。     

IMPACT OF ATMOSPHERIC LOW-FREQUENCY OSCILLATION ON THE IMMIGRATION OF NILAPARVATA LUGENS(STL) IN HUNAN AND JIANGXI PROVINCES

Various features of the atmospheric environment affect the number of migratory insects, besides their initial population. However, little is known about the impact of atmospheric low-frequency oscillation(10 to 90 days) on insect migration. A case study was conducted to ascertain the influence of low-frequency atmospheric oscillation on the immigration of brown planthopper, Nilaparvata lugens(Stl), in Hunan and Jiangxi provinces. The results showed the following:(1) The number of immigrating N. lugens from April to June of 2007 through 2016 mainly exhibited a periodic oscillation of 10 to 20 days.(2) The 10-20 d low-frequency number of immigrating N. lugens was significantly correlated with a low-frequency wind field and a geopotential height field at 850 h Pa.(3) During the peak phase of immigration, southwest or south winds served as a driving force and carried N. lugens populations northward, and when in the back of the trough and the front of the ridge, the downward airflow created a favorable condition for N. lugens to land in the study area. In conclusion, the northward migration of N. lugens was influenced by a low-frequency atmospheric circulation based on the analysis of dynamics. This study was the first research connecting atmospheric low-frequency oscillation to insect migration.