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运用主成分分析法(PCA),分析了室内繁蚜过程中豆蚜种群消长的主要因素。结果表明,影响豆蚜种群消长的主要因素有三类,分属三个主成分。第一主成分的特征根为3.34,是营养属性,对豆蚜种群消长的影响主要在繁蚜后期;第二主成分特征根为3.02,是生长率属性,主要在繁蚜中期起作用;第三主成分特征根为2.25,主要在繁蚜初期起作用。
Principal component analysis (PCA) was used to analyze the main factors that affected the population growth and decline of Aphis gossypii in indoor aphids. The results showed that there are three main factors that affect the population growth and decline of A. sojae, which belong to three main components. The main root of the first principal component is 3.34, which is the nutritional attribute. The main influence on the population growth of the aphids is mainly in the late stage of the aphids. The characteristic root of the second principal component is 3.02, which is the growth rate attribute and mainly acts in the mid-stage of the aphids. The three main components of the root of 2.25, mainly in the early aphid play a role.