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.
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