气温对福清地区晚稻褐飞虱种群消长的影响效应

Impact of Air Temperature to the Brown Planthopper Population in Late Rice Crop Season in Fuqing Region

采用回归积分方法研究了福建省福清地区晚稻生长期间不同阶段气温变化对褐飞虱种群消长的影响。结果表明 ,气温对褐飞虱种群消长的影响效应分为五个阶段 :第一阶段为晚稻移栽期至分蘖早期 ,气温影响为负效应 ,高温对褐飞虱种群增殖有明显的抑制作用 ;第二阶段为分蘖期至孕穗期前 ,气温影响为正效应 ,相对高的气温有利于褐飞虱种群的发展 ;第三阶段孕穗期和第四阶段抽穗、扬花、灌浆期 ,此时食料条件很适宜褐飞虱种群的生长 ,而气温的影响效应相对较低 ;第五阶段为负效应。第一阶段和第二阶段为气温影响褐飞虱种群的关键时期 ,两个阶段处于褐飞虱定植为害的早期 。

By using regression-integral methods, the impact of air temperature to the population of the Brown Planthopper (Nilaparvata lugens Stl) during the growing season of late rice in the Fuqing region, Fujian Province, was studied.The impact was divided into five phases.The impact of air temperature to the population increase was negative in the first phase from transplanting to early tillering stages.The high temperature restrained obviously the population increase; In the second phase, from tillering to early booting period, the impact of air temperature to the population increase was positive.The higher air temperature benefited the population growth; during the third (booting stage) and fourth (heating, flowering and filling stage) phase, the nutrition conditions were very fited for the growth of the Brown Planthoppers, however, the impacts of air temperature was relative lower; The impact of air temperature to the population increase was negative in the fifth phase.The first and second phases were the key phases, in which the Brown Planthoppers were in the early damage stages to the rice transplanting.Whether the outbreak of the Brown Planthopper population during late rice growing periods occurred was highly related with the suitability of the temperature conditions in the early phases of the development of the Brown Planthopper population.