麦双尾蚜与麦田中生物和非生物因子的灰色关联分析

利用灰色系统理论，将麦双尾蚜Diuraphis noxia (Mordvilko) 种群消长动态与麦田生物群落中主要生物因子和非生物因子进行灰色关联分析。结果表明影响麦双尾蚜及其它麦蚜种群消长的关键因子主要为麦蚜间的竞争和天敌的捕食压力。非生物因子的作用较小，其中较重要的因子有平均相对湿度和降水量。在塔城小麦田中关键天敌类群为瓢虫类，寄生天敌的影响较小；在伊犁小麦田中，麦双尾蚜及其它麦蚜的关键天敌类群为蚜小蜂类，大麦田中斑腹蝇类较重要，燕麦田中瓢虫类占优势。

GREY CORRELATION ANALYSES AMONG RUSSIAN WHEAT APHID AND ITS ASSOCIATED FACTORS IN WHEAT FIELDS

The relationships among the Russian wheat aphid (RWA), Diuraphis noxia (Mordvilko), other wheat aphids, natural enemies and abiotic factors were investigated in wheat, barley and oat fields in Xinjiang Uygur Autonomous Region, China, using theory of grey control system. The results indicated that competition of other wheat aphids with RWA and predation of natural enemies were the leading factors controlling the RWA population. Abiotic factors played secondary effect, among which precipitation and relative humidity in air were important relatively. The most important natural enemy of RWA was coccinellids in both wheat field in Tacheng and oat field in Ili. However, aphelinids and Leucopis spp. Were the most important enemies in wheat and barley fields in Ili respectively.