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cje ›› 1998, Vol. ›› Issue (3): 11-15,26.

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Selection of Evaluation Factors for Natural Villages by the Factory Analysis Method in the Huang Huai Hai Area

Liu Jinlong   

  1. Chinese Academy of Forestry, Beijing 100091
  • Received:1996-05-06 Online:1998-06-10

Abstract: This paper tried to use factory analysis method in study of vectory analysis and selection of evalution factors for natural village ecosystem in forestry, agricultural, living hansbandry and natural, economic and social indexes in the Huang Huai Hai area. Five vectors from high to low according to their percentage of eigenvalue over the total were as follows: Natural-economic vector, social vector, forestry vector, living hansbandry vector, and agriculture vector. The accumulation of total percentage was up to 80.0%. The main factors were also obtained according to their loading matrix in each vector.

Key words: Aphis gossypii, host plant, life table, population parameter.