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Relationships between overwintering Agrotis segetum population and snow

Lü Zhaozhi1;WANG Peiling2;ZHANG Qiuhong3;GONG Zhizhong3;DING Hong3   

  1. 1Xinjiang Ecology and Geography Institute, Chinese Academy of Sciences,Urumqi 830011, China;
    2Agronomy College, Shihezi University,Shihezi 832003, China;
    3Shihezi Agricultural Extension in Mosuowan, Shihezi 832056, China
  • Received:2006-04-03 Revised:2006-09-11 Online:2006-12-10 Published:2006-12-10

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Abstract: Based on the 1992-2001 data of light trap, this paper analyzed the relationships of overwintering Agrotis segetum population with the maximum snow depth and the days of snow covering in North Xinjiang. The results showed that the emerge nce of overwintering generation was from April 30 to June 15, and the population size fluctuated obviously among years. The population number of overwintering A. segetum had a significant negative correlation with the days of snow covering from January to early April (R2=0.6022, P<0.0083), but no significant correlations with the maximum snow depth(R2=0.23,P=0.1577)and the days of snow covering(R2=0.099,P<0.3748) from November to next April.The duration of snow covering from January to early April could be used as an important parameter in predicting the dynamic of A. segetum population.

Key words: Degraded soil, Potentilla anserina, Clonal growth, Biomass allocation