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2003年稻纵卷叶螟Cnaphalocrocis medinalis Guenée在我国特大暴发,给水稻生产带来了严重的损失。为了揭示大发生种群形成的原因,本文对2003年稻纵卷叶螟种群动态和气候背景进行了分析。结果表明:气候异常是2003年稻纵卷叶螟特大发生的主要原因。(1)2月越南北方、华南南部气温异常偏高,导致成虫始见期为历史最早年份,初始虫源量成倍增长。(2)7月份西北太平洋副热带高压异常偏强、偏西,导致江南地区出现严重的高温干旱,促使江西、湖南早、中稻上的稻纵卷叶螟大规模北迁至长江中下游单季晚稻区。(3)8月份下旬—9月上旬,西太平洋副热带高压的南撤较常年明显偏迟,高压区长时间控制我国华东地区,形成了秋季高温、季风转换推迟的现象,导致江淮地区六(4)代成虫未能回迁,而是滞留在当地,比常年多发生了一个世代。
In 2003 the rice leaf roller Cnaphalocrocis medinalis Guenée outbreak in our country, has brought serious losses to rice production. In order to reveal the reasons for the occurrence of large population, the population dynamics and climate background of rice leaf roller in 2003 were analyzed. The results show that the climatic anomaly is the main reason for the huge occurrence of C. medinalis in 2003. (1) In February, the anomalously high temperature in northern Vietnam and southern South China caused the earliest onset of adult adults and the initial increase of insect population. (2) In July, the subtropical high over the western North Pacific was anomalously strong and westward, resulting in severe high temperature and drought in the southern part of the Yangtze River. This led to the large-scale northward migration of rice leafrolling larvae on the early and middle rice in Jiangxi and Hunan to the single-cropped late rice in the middle and lower reaches of the Yangtze River. Area. (3) In late August-early September, the south withdrawal of the western Pacific subtropical high was significantly delayed compared with that of normal years. The high-pressure zone controlled the eastern China for a long time, resulting in the autumn high temperature and the delay of the monsoon transition. As a result, ) On behalf of adults failed to move back, but stay in the area, occurred more than usual for a generation.