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Chinese Journal of Applied Ecology ›› 2003, Vol. ›› Issue (8): 1359-1362.

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Chaotic diagnosis of Nilaparvata lugens occurrence system

XU Xiaofeng1, MA Fei2, ZOU Yunding3, CHENG Xianian2   

  1. 1. Life School of Nanjing Normal University, Nanjing 210097, China;
    2. Key Laboratory of Monitoring and Management of Plant Disease and Insects, Ministry of Agriculture, Nanjing Agricultural University, Nanjing 210095, China;
    3. Anhui Agricultural University, Hefei 230036, China
  • Received:2001-03-22 Revised:2001-06-13

Abstract: It is estimated that there are nearly 20 million hectares of rice crop being infested by Nilaparvata lugens, with an annual loss of some half a million tones of grain. In order to study the properties and laws of Nilaparvata lugens occurrence system further, the time series data of Nilaparvata lugens occurrence from 1986 to 1998 collected in Taihu Lake District were analyzed by using the methods of autocorrelation function, power spectrum figure, phase trajectory figure, poincare section, and return map of chaos theory. The results indicated that Nilaparvata lugens occurrence system in Yangtze River valley area in China had an obvious chaotic property, even though there was some interference of random noises.

Key words: Nilaparvata lugens, Chaos, Power spectrum figure, Return map, Autocorrelation function, Poincare section, Phase trajectory figure

CLC Number: