光温因子对超级杂交稻生长及产量的影响

Effect of Light and Temperature Factors on Growth and Yield of Super Hybrid Rice

为了解光温因子对超级杂交稻生长及产量的影响,利用湖南省内多个试验点多年的超级稻大田小区试验数据,分析了光温因子与超级稻生物积累量、产量构成因素及产量的典型相关性。结果表明,不同生育时期内的光温因子与超级稻产量构成因子、生物积累量、产量的组间均有着显著的典型相关性,尤其是与产量构成因子间的第一、第二和第三典型相关系数均达到极显著水平。光温因子主要通过单位面积有效穗数、每穗粒数和单位面积颖花量的作用而影响超级稻产量;不同生育期对超级稻起主导作用的光温因子不同,全生育期内的光温因子以日均低温对超级稻的影响最大,其次是日均高温,再次是累积日温差。

Field experiments were conducted at 5 experiment stations in Hunan Province to explore the effects of light and temperature on growth and yield of super hybrid rice in 2004 to 2005,and the relationships between light and temperature and the biomass,yield components,yield of super hybrid rice was analyzed,respectively.The results showed that canonical correlation between light and temperature factors in different growth stages and yield components,biomass and yield was significant,especially the first,second and third canonical correlation coefficient between the light and temperature factors with yield components of super hybrid rice were very significant.The light and temperature factors greatly affect yield mainly by the productive panicle number,spikelets per panicle and spikelet＇s per unit area.The main affecting factors on super hybrid rice were different at different growth stages.During the whole growth duration,the mean of minimum-daily air temperature greatly affected super hybrid growth and yield,followed by maximum-daily air temperature and accumulated temperature difference.