【摘要】 利用频次分布卡方(X~2)检验、Iwao平均拥挤度m=α+βm、Taylor幂法则S~2=am~b等8种方法,分析了银纹夜蛾与豆天蛾幼虫在大豆田的空间分布.结果呈嵌纹分布和聚集型分布.据此,确定了两种害虫的科学抽样方式和不同密度下的合理抽样数量.更多还原

【Abstract】 Frequency distribution x~2test , Iwao’s mean crowding m= α + βm, and Taylor’s power law s~2=am~betc. Altogether 8 methods were employed to analyze the spatial distribution of larvae of three-spotted phytometra ( Phytometra agnata Stausinger ) and greenish-brown hawk moth ( Clanis billineata Walker ) in soybean fields. The results showed that the distribution pattern belonged to negative binomial and aggregative distributions.The scientific sampling size and suitable sampling number under different densities on the two pests were consequently determined.更多还原