Chinese Journal of Agrometeorology ›› 2013, Vol. 34 ›› Issue (02): 215-220.doi: 10.3969/j.issn.1000-6362.2013.02.014

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Autumn Chilling Indices during Heading to Flowering of Rice in Guizhou Province

WANG Lian xi1，2，ZUO Jin1，2，GU Xiao ping3，XU Yong ling3，LI Qi1，2   

  1. 1Nanjing University of Information Science and Technology/Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control，Nanjing210044，China；2School of Environmental Science and Engineering of NUIST，Nanjing210044；3Guizhou Institute of Mountainous Environment and Climate，Guiyang550025
  • Received:2012-07-24 Online:2013-04-20 Published:2013-04-16

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Abstract: The cold accumulated temperature index for autumn chilling of rice in Guizhou province was analyzed by using of mathematic statistics and comparative confirmation methods，based on historical climate data and the rice yield data in typical autumn chilling of 1974，1980，1988 and 2002，considering the lowest biological temperature（LBT）values during heading to flowering of rice on different altitude.The regression equation between low-yield rate and cold accumulated temperature（LJW）in 2002 was established，and then the light，moderate，severe，most severe autumn chilling injury grades of rice in Guizhou were determined as 17＜LJW≤21，21＜LJW≤25，25＜LJW≤29，LJW＞29.The comparative results of the two methods （cold accumulated temperature and cold dew index）demonstrated that the cold accumulated temperature was superior to cold dew index in its application.

Key words: Rice, Autumn chilling injury, Cold accumulated temperature index, Guizhou province