中国稻米垩白形成的地域分异规律之初步研究

 通过19个品种在全国13个点的多播期试验，分析了稻米垩白形成的气象生态基础及我国稻区不同稻作制下水稻气象垩白的分异情况。结果表明，水稻齐穗后15 d内的温度状况是稻米垩白形成的主导因子；且自北而南，稻米气象垩白随水稻齐穗后15 d内均温的变化由小到大。气象垩白<5%的稻区为四川盆地以北、淮河以北及云贵高原地区，5%～10%的稻区为四川盆地、滇南及淮南至沿江江南地区，10%～20% (只为双季稻的早稻)的稻区为云贵高原以东长江以南地区。

Primary Research on Regionalization Rules of Rice Chalkiness Formation in China

Based on the experiment with 19 rice varieties and different sowing dates at 13 locations in China, meteorologic ecological basis of rice chalkiness formation and the regionalization of meteorologic chalkiness in rice growing areas with different rice farming system have been analysed. Daily mean temperature in the period of 15 days after rice full heading stage is a leading factor affecting rice chalkiness, and from north to south the rice meteorologic chalkiness varies from small to large with the change of daily mean temperatare of 15 days after rice full heading; the rice growing areas of the meteorologlc chalkiness area of≤5% include areas on the north of the Sichuan Basin, areas on the north of the Huaihe River and areas of Yun-Gui High Plateau; those of 5%-10% include Sichuan Basin, areas in the south of Yunnan province and areas from the south of Huaihe River to along the south of Yangtse River; those of 10%-20% (only concerning early rice of double-cropping rice) include areas on the east of Yung-Gui High Plateau and on the south of Yangtse River.