以盆钵和大田栽培相结合， 研究了抽穗灌浆期模拟阴天条件下和模拟阴天处理结束后恢复期的群体光质环境变化及其对产量形成的影响。结果表明， 阴天使水稻群体的入射和吸收光谱中的光合有效辐射及蓝光（４００～５１０ ｎｍ ） 和红光（６１０～７２０ ｎｍ ） 辐射能大幅度减少，且各自在总辐射中所占的比例均显著小于晴天， 以蓝光减少较多；在恢复生长期，也有类似趋势，其中红光占总辐射的比例减少幅度更大，从而使水稻群体干物质生产下降，分配失调，结实率降低，导致水稻减产。１９９５ 和１９９６ 年的减产率分别为３６５％ 和３５９％ ，１９９７年各时段处理的减产范围在９７％ ～３１０％ 之间 With the combination of pots and field cultivation, the changes of the light quality of the population under the simulated cloudy days at the heading stage and the convalescence stage after the simulated cloudy days were studied and their effects on the yield formation were studied. The results showed that the photosynthetically active radiation and the radiant energy of blue light (400 ~ 510 nm) and red light (610 ~ 720 nm) in the incident and absorption spectra of cloudy population were greatly reduced, and their respective proportions in the total radiation Were significantly less than that of sunny days, with much less blue light; similar trends were observed in the recovery growth period, in which the proportion of red light in total radiation was reduced more greatly, leading to the decline of dry matter production, the imbalance of distribution and the decrease of seed setting rate Reduce production of rice. The yield reduction rates in 1995 and 1996 were 365% and 359% respectively. The reduction in production in each period in 1997 ranged from 97% to 310%