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在群体水培条件下,以国内外不同年代育成的籼稻代表品种(2001年为88个、2002年为122个)为材料,于抽穗期和成熟期测定根、茎鞘、绿叶、黄叶和穗等器官的干物重及不同器官的氮素含量,采用组内最小平方和动态聚类方法对供试品种的氮素籽粒生产效率(NUEg)进行聚类,研究不同NUEg类型籼稻品种干物质生产与分配的特点。结果表明,(1)供试籼稻品种间NUEg的差异很大,A、B、C、D、E、F类籼稻品种的平均NUEg 2001年分别为20.51、31.04、35.64、39.46、43.555、0.92 g g-1,2002年分别为24.33、31.61、35.83、39.06、43.515、0.00 g g-1;(2)不同NUEg类型籼稻品种间生物产量差异不大,但高NUEg类型籼稻品种抽穗期干物质积累量较小,抽穗后干物质生产量大且占生物产量的比例高;(3)不同NUEg类型籼稻品种间抽穗期的根干重和茎鞘干重占全株干重的比例差异不大,但NUEg水平越高的籼稻品种,其成熟期的根重和茎鞘重占全株干重的比例越小;(4)NUEg水平越高的籼稻品种,其抽穗期和成熟期的叶片干重占全株干重的比例越小,穗干重占全株干重的比例越大。
Under population hydroponics conditions, indica rice varieties (88 in 2001 and 122 in 2002), which were bred at different ages at home and abroad, were used as materials to determine root, stem and sheath, green leaf, yellow leaf and Spike and other organs of dry weight and nitrogen content in different organs, using the least squares and dynamic clustering method to test the NUEg of the tested cultivars to study the effects of different types of NUEg dry matter production of indica varieties With the characteristics of the distribution. The results showed that: (1) There was a great difference in NUEg among indica rice cultivars. The average NUEg of indica rice varieties A, B, C, D, E and F in 2001 was 20.51, 31.04, 35.64, 39.46, 43.555 and 0.92 g g-1 in 2002 was 24.33, 31.61, 35.83, 39.06, 43.515 and 0.00 g g-1 respectively. (2) There was no significant difference in biomass between different NUEg indica cultivars, but the dry matter accumulation (3) The root dry weight and dry weight of stems and sheaths at heading of different NUEg cultivars had no significant difference among the total dry weight, However, the higher the NUEg level of indica rice varieties, the maturity of the root weight and stems and sheaths accounted for less than the proportion of total plant dry weight; (4) The higher the NUEg indica varieties, heading and maturing leaf dry weight The smaller the proportion of total dry weight of the whole plant, the greater the proportion of dry weight of whole plant dry weight.