干旱区田间高温与棉蚜种群动态的关系初探

Preliminary Study on Relationship Between Field High Temperature and Cotton Aphid Population(Aphis gossypii Glover) Dynamic state in Arid Area

【目的】探索干旱区田间高温对夏季棉蚜种群动态的影响。【方法】于2008年夏季在阜康地区调查了高温时节田间棉蚜种群动态及其构成,同时分析了相关的关键气象要素。【结果】新疆北部干旱区田间棉蚜存在繁盛期种群崩溃现象,持续多天的高温导致了田间棉蚜种群数量开始急剧下降,在种群数量达到峰值前,高温影响下棉蚜种群已经开始崩溃,表现为种群老龄化,种群迁出趋势增强。【结论】棉蚜种群崩溃开始于种群构成发生变化;高温是棉蚜种群崩溃的关键因子之一。

[Objective]To explore the influence of field high temperature on the cotton aphid population dynamic state.[Method]The field cotton aphid population dynamic state and composition in the high temperature of summer at Fukang, Xinjiang were surveyed.At the same time,the related important meteoroloyical factors were analyzed.[Result]The results indicated that： the phenomenon of cotton aphid population crash in midsummer occurred in arid area of northern Xinjiang.The cotton aphid in the field decreased sharply because of the high temperature continuing for several days.Before field cotton aphid population going up to the peak,under the high temperature condition,the population had began to crash,such as population aging and emigration of population.[Conclusion]Cotton aphid population crash in mid-summer began with population composition changing.Field high temperature was one of most important direct causes.