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cje ›› 1990, Vol. ›› Issue (4): 16-19.

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Spatial Dynamics of Wheat Aphid Population under Natural Conditions

Zhao Huiyan, Wang Shize, Dong Yingcai   

  1. Plant Protection Department, Northwest Agriculturol University
  • Received:1988-09-13 Revised:1988-12-23 Online:1990-08-10

Abstract: Spatial dynamics of 3 wheat aphid populations are investigated.The aggregation and dispersion indices of 3 wheat aphids and their mixed populations are compared under the sameenvironment at different time.It is found that the distribution of wheat aphid populationand its colonization within population show a tendency of periodical aggregation and dispersion with time sequence.It is the first time in the paper to describe this tendency withresistant free vibration model,which is more suitable than Fourier Series.

Key words: Chinese fir plantation, Soil organic matter, Continuous planting