5个籼稻品种的产量形成特点和库源类型研究

采用疏花、降密、去叶等改变库源比例的方法，对5个籼稻品种的库源类型进行了研究。结果表明：水稻库的接纳能力对抽穗后干物质生产量有一定的调控作用；华矮21的结实率随抽穗后同化产物供应量的增减而急剧升降，为源限型品种：扬稻6号和景龙6号的结实率不因抽穗后颖花数的减少和密度的减低而提高，为库限型品种；在一定范围内，库－源比例的改变对嘉育948和988的结实率的影响明显小于华矮21而略大于扬稻6号和景龙5号，二者为库源互作型品种。

Study on the Character of Grain Yield formation and Sink Source Types in Five Indica Cultivars in Rice

In this study, the methods of spikelet removal, thinning and defoliation were used to identify the type of sink source of each cultivar in five contrasting indica cultivars in rice. The results obtained indicated that sink capacity to accept assimilate of rice showed some ability to adjust the dry matter production after anthesis. The filled grain percentage of cultivar Huaai 21 increased and decreased sharply with the increasing and decreasing of assimilate supply(source) after anthesis , the grain yield of it was limited by source . The filled grain percentage of cultivar Yangdao 6 and cultivar Jinglong 5 did not increase by spikelet removal and thinning treatments ,and did not decrease much by removing the third leaf from the plant top , their grain yield was limited by sink capacity to accept the assimilate. The variation of filled grain percentage of cultivar Jiayu 948 and cultivar 988 was little with variation limited in the ratio of source to sink, their grain yield was controlled by the cooperation of source and sink.