Chinese Journal of Agrometeorology ›› 2015, Vol. 36 ›› Issue (01): 50-56.doi: 10.3969/j.issn.1000-6362.2015.01.007

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Revision on Meteorological Indices of Florescence Frost Disaster for Fuji Apple in Shaanxi Province

WANG Jing hong,LIU Lu,GAO Feng,BAI Qin feng,GUO Liang   

  1. 1Shaanxi Meteorological Service Observatory for Economical Crop,Xi'an710014,China;2Northwest Agriculture and Forestry University,Yangling712100
  • Received:2014-06-30 Online:2015-02-20 Published:2015-05-21

Abstract: Taking flowering branches from 8-10 years old Fuji apple tree in Shaanxi province as materials,making the ovary freezing with artificial climate box,the sample branches were frozen in the temperature range of-5℃ to 10℃,and the changing curves of temperature to ovary tissue freezing and time were obtained,on which determined super cooling point and the freezing point. 7 groups freezing rates of Fuji apple flowers were found with different low temperature and duration tests in artificial climate box,taking the low temperature as reference,on which determined the preliminary apple florescence freezing indices.These indices were revised by the self repair effect factor,which was found in historical disaster survey,and then the new apple florescence freezing indices was established.The results showed that the super cooling point of Fuji apple flower was-2.5℃ to-4.0℃,the apple florescence freezing rate was related with low temperature intensity and its duration,and the lower temperature or the longer duration,the higher frost rate.Besides,some frozen flowers cloud bear fruit in the future,and this self repair ability cloud reduce 18 percent preliminary freezing rate.Based on these results,the new weather indices of Fuji apple florescence freezing disaster were established. By comparison,the new indices were more consistent than the original indices,and the higher frost level,the higher agreement degree.

Key words: Florescence, Freezing, Low temperature, Duration, Super cooling point