GEOGRAPHICAL RESEARCH ›› 2008, Vol. 27 ›› Issue (3): 603-612.doi: 10.11821/yj2008030014

• Earth Surface Processes • Previous Articles     Next Articles

Impacts of maximum or minimum temperature on yield and yield components of single-season Indica rice in Yangtze-Huaihe area

MA Xiao-qun1, XU Ying1, ZHAO Hai-yan2   

  1. 1. Anhui Institute of Meteorological Science, Key Laboratory of Atmospheric Science and Satellite Remote Sensing of Anhui Province, Hefei 230031, China|
    2. Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Key Laboratory for Agro-Environment and Climate Change, Ministry of Agriculture, Beijing 100081,China
  • Received:2007-09-22 Revised:2008-03-14 Online:2008-05-25 Published:2008-05-25
  • Supported by:

    国家"十五"科技攻关计划课题(2004BA611B-02)、国家科技支撑计划课题 (2006BAD04B04)资助 。

Abstract:

Under the background of climate warming, characteristics of maximum and minimum temperature variation may markedly affect yield and yield components of rice. Maximum or minimum temperatures in the stage of yield formation during recent 50 years in the Yangtze-Huaihe area were analyzed. The result showed that the temperature-rising rate of minimum temperature has been higher than that of maximum temperature, with a decreasing diurnal temperature range (DTR), and an increasing intensity and frequency of extremely hot weather since 1991. The dynamic analysis of daily maximum or minimum temperature in different step-lengths with rice yield and yield components were made, using experimental data of Anhui Academy of Agricultural Sciences during 2000~2004. The result indicates that there are two negative effect stages of temperature on rice and rice yield before tasseling and after tasseling. And the temperature effect is most obvious on seed-setting rate, secondly on 1000-grain weight and thirdly on yield. The effect of minimum temperature on rice is greater than that of maximum temperature. With the increase of moving step-length in temperature, the increase of negative effect on maximum temperature occurs before tasseling, while the negative impacts of minimum temperature appear throughout yield formation process.

Key words: climate warming, maximum temperature, minimum temperature, single-season Indica rice, yield, yield components