营养生长期模拟阴天光质环境对水稻生育与产量形成的影响

The Effects of Light Quality Environment Under Simulated cloudy Conditions During Vegetative Growth Stage on Rice Development and Yield Formation

通过营养生长期模拟阴天光谱辐射能的变化对水稻生长发育与产量形成的影响结果分析，阐明了阴天光谱辐射能的减弱，主要是减少了促进水稻光合生产的蓝光（４００～５１０ｎｍ）与红光（６１０～７２０ｎｍ）波段的辐射能，从而影响了水稻植株正常的碳氮代谢活动，抑制了稻株的生长，减少与延迟稻苗的分蘖，使有效穗数下降或小型穗增多。

The effects of growth, development and yield of rice under the changes of spectral radiant energe in simulated cloudy days during the vegetative stage were analysed. The results indicated that the weakening of spectral radiant energy in cloudy days was mainly due to the decrease of both blue light (400￣510nm) and red light (610￣720nm) that promote the photosynthetic production in rice. Under cloudy conditions, the normal carbon nitrogen metabolism in rice was affected, plant growth was inhibited. tillering was delayed and tiller number reduced. All of these resulted in a decline in rice yield because of fewer effective panicles and more small panicles.