摘要
通过田间调查,比较露地、窄膜、宽膜、全膜和秸秆覆盖下主要棉田害虫和天敌种群动态。结果表明,不同覆盖方式对棉蚜种群动态影响很大,除窄膜和宽膜覆盖之间差异不显著外,其他覆盖差异均达到极显著,7月16日全膜和秸秆覆盖达峰值,比露地、窄膜和宽膜覆盖早5 d;高峰时全膜覆盖棉蚜数量分别是露地、窄膜、宽膜和秸秆覆盖的2.56、1.78、2.16倍和5.93倍。对棉叶螨种群动态影响不同于棉蚜,整个调查期,窄膜、宽膜和全膜之间无论从数量还是增长速率来看都呈相似趋势,而秸秆覆盖棉田棉叶螨数量显著高于其他覆盖,高峰时分别高出露地、窄膜、宽膜和全膜覆盖9 584.4、7 816.4、7 540.4头/百株和8 436.8头/百株。不同覆盖下主要天敌种类基本一致,但种群变化并没有明显的规律。
Population dynamics of cotton pests and their natural enemies were investigated in fields with different coverings.Field coverings had great influence on the population dynamics.The difference of population dynamics of cotton aphids reached a very significant level between different coverings except for between narrow film and wide film coverings.The number of cotton aphids under complete film covering and straw mulching reached a peak value on July 16,which was five days earlier than that of under no coverage,narrow film or wide film coverings;the peak value of cotton aphids under complete film covering was 2.7,1.8,2.2 and 5.93 times that of under no coverage,narrow film,wide film covers and straw mulching.The influence of field coverings on cotton spider mites was not same as on cotton aphids.The variation tendencies of number and increasing rate of cotton spider mites under narrow film,wide film and complete film coverings were similar.Number of cotton spider mites under straw mulching was greater than under other field coverings,and the peak value was more 9 584.4,7 816.4,7 540.4 per 100 plant respectively than under no coverage,narrow film,wide film and complete film coverings.Species of natural enemies of cotton pests under different field coverings were the same,and there was not an obvious tendency for population dynamics of natural enemies of cotton pests.
出处
《中国沙漠》
CSCD
北大核心
2011年第1期180-184,共5页
Journal of Desert Research
基金
中国科学院知识创新工程项目(KZCX2-XB2-03-2)
中国科学院农业项目(KSCX2-YW-N-41)
国家科技支撑项目(2008BADA5B05-2)资助
关键词
棉蚜
棉叶螨
天敌
种群动态
覆盖方式
cotton aphids
cotton spider mites
natural enemies
population dynamics
field covering
