Impact Assessment on High Temperature Damage to Early Rice at Filling Milk Stage in Jiangxi Province

doi:10.3969/j.issn.1000-6362.2015.01.009

Abstract

Abstract: Based on observed data from 14 agricultural meteorological stations in Jiangxi province from 2000 to 2013，and daily maximum temperature data from last 10 days in June to early 10 days in July，the main influence factors and assessment model were established. The model was verified by rice yield and investigated disaster data from 2000 to 2012 and experiment data during 2012-2013. The results showed that the main influence factors of high temperature damage to rice were increasing extent of temperature，extreme maximum temperature and high temperature duration. Based on this，the assessment model of high temperature damage was established by using principal component analysis method，and tested through historic back and sowing rice by stage.The testing results indicated that the accurate rate of model was higher，which could be used to evaluate impact quantitatively of high temperature damage to rice.The assessment factors could be defined as severe damage when HTDI≥0.60，the yield reduction rate of early rice was more than 10%; moderate damage when 0.30≤HTDI<0.60，the yield reduction rate of early rice was between 5%-10%;slight damage when 0.10≤HTDI<0.30，the yield reduction rate of early rice was less than 5%.

Key words: Early rice, High temperature damage, Assessment model, Grade classification, Principal component analysis

TIAN Jun，CUI Hai jian. Impact Assessment on High Temperature Damage to Early Rice at Filling Milk Stage in Jiangxi Province[J]. Chinese Journal of Agrometeorology, 2015, 36(01): 67-73.

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