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该文分析了北京地区春季气候条件对冬小麦穗分化的影响,得到了早春单棱至护颖期间≤7.5℃,护颖至顶端小穗分化期间≤10.5℃出现的天数愈多、愈有利小穗分化的温度指标,及穗分化期间出现日期所需大于0℃的积温指标,如护颖期出现需245度一日,四分体出现需575度-日等。文章还讨论了穗分化速率与温度、穗分化的持续时间之间的关系,并根据北京地区春季天气条件对分化小穗数的不同影响,划分了春暖,春凉及正常三种农业气候年型。
In this paper, the effect of spring climatic conditions on spike differentiation of winter wheat in Beijing was analyzed. The results showed that during the period from single-ridge to longifloria in spring, the number of days was less than or equal to 7.5 ℃, Differentiation temperature indicators, and the date of emergence during the emergence of more than 0 ℃ required for the accumulated temperature indicators, such as the care of the emergence of the need to 245 degrees a day, quadruple appear to need 575 degrees - day and so on. The paper also discussed the relationship between the rate of spike differentiation and the duration of temperature and spike differentiation. According to the different influences of spring weather conditions on the number of spikelets in Beijing, the paper divided the three types of annual climates: spring, spring and normal .