【摘要】 作者自1988年4月(不包括9月、10月)至1989年3月间,对济南市东郊粮库贮存的大米进行了系统取样调查.根据所获得的定量数据,利用主分量分析方法,对昆虫、螨类和物理因子之间的生态关系做了探讨.更多还原

【Abstract】 Principal-component analysis (PCA) was used to probe and determine ecological interrelations among insects,mites and physical factors based on the samples collected semi-monthly from the rice in sacks stored in a house grainary at Dongjiao grainaries of Jinan,Shandong,from April, 1988 to March, 1989(September and October, 1988 excluded).更多还原