麦双尾蚜自然种群的特定时间生命表

根据新疆伊犁、塔城两地小麦田调查资料，组建了麦双尾蚜Diuraphis noxia (Mordvilko) 自然种群特定时间生命表。由生命表分析得知，小麦早期生长发育阶段，麦双尾蚜迁移造成的种群数量损失很小，反映了麦双尾蚜在早期种群密度较低，个体对食物和空间资源的竞争压力较小。寄生性天敌在小麦田出现较晚，在两地小麦早期生长阶段，由寄生造成的种群损失也极低。整个麦类作物生长阶段，捕食天敌对麦双尾蚜种群的控制作用非常重要，是麦双尾蚜种群损失的关键因子之一。迁移造成的种群损失比寄生性天敌的还要大，说明迁移是麦双尾蚜种群自我调节的重要手段。

TIME-SPECIFIC LIFE TABLE OF NATURAL POPULATI0N OF THE RUSSIAN WHEAT APHID

Hughes' analytical approach was used for constructing time-specific life tables of the Russian wheat aphid (RWA)，Diuraphis noxia (Mordvilko)，to examine effects of different factors on its population dynamics in wheat，barley and oat plots in Xinjiang Uygur Autonomous Region，China. It showed that the predatory enemies played leading role in suppressing population growth of the aphid in early season in wheat field. Both predators and parasitoids were basic factors controlling the RWA population in the middle and late season in wheat，barley and oat plots. The alatae emigration as a self-regulating factor within the population was also important when the aphid density increased to certain level.