北京地区冬小麦穗分化与气候条件关系的分析

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。

THE RELATIONSHIP BETWEEN CLIMATIC CONDITION AND SPIKELET DIEFERENTIATION OF WINTER WHEAT IN THE DISTRICT BEIJING

This paper deals with the effect of spring climatic condition on the spikelet differentiation of winter wheat in the district Beijing The optimum temperature indexes for spikelet differentiation were found out. In early spring the more the number of days with daily vaerage temperature≤7.5℃ between single ridge and glume and≤10.5℃ from glume to the formation of terminal spikelet, the more farourable to spikelet differentiation.The indexes of accumulated temperature≥0℃ at the apperence of differentiation stages are 245 degree day for glume and 575 degree day for tetrad stage etc. This paper also discussed the relationship among the rate of spikclet differentiation and temperature or duration of differentiation and suggested three agroclimate year typesworm, cooland normal in spring, according to the effect of spring climatic condition on the spikelet differentiation of winter wheat