中文摘要：

2001和2002年，在群体水培条件下，取籼稻代表品种210个，于抽穗期和成熟期测定根、茎鞘、绿叶、黄叶和穗的干物重以及氮素含量，采用组内最小平方和的动态聚类方法对供试品种成熟期的氮素累积量进行聚类，分析不同氮素累积量类型品种间物质生产与分配的特点。结果表明：（1）供试品种成熟期氮素累积量差异很大，可聚类为A、B、C、D、E、F6类，类型间的差异均达到了显著水平；（2）高氮素累积量类型籼稻品种物质生产的特点为抽穗前和抽穗后干物质生产量大，且抽穗后干物质生产比例也较大，因而生物产量高；（3）高氮素累积量类型籼稻品种抽穗期干物质分配的特点为根干重所占比例较小，叶片干重所占比例较大，成熟期干物质分配的特点为根干重和穗干重所占比例较小，而茎鞘干重所占比例较大，经济系数较低。

英文摘要：

Eighty eight and additional thirty four conventional indica rice cultivars were solution-cultured in year 2001 and 2002, respectively. Dry matter （DM） weight as well as nitrogen （N） content in individual organs including root, stem, sheath, leaf and panicle was measured. The tested rice cultivars were classified into six types （ i. e. A,B,C,D,E and F） based on their N accumulations at maturity by the MInSSw method, between which the differences of DM accumulation and distribution were analyzed. The average N accumulation of different types varied significantly from 10, 40 g/m2 to 25. 13 g/m2 in 2001 and from 8.53 g/m2 to 33.31 g/m2 in 2002, High N accumulation types of rice cultivars showed stronger DM accumulation before and after heading, higher ratio of DM accumulation to biomass after heading and larger biomass at maturity. However DM distributioin of these rice types was characterized by lower ratio in root but higher ratio in leaf at heading and lower ratio in root and panicle but higher ratio in stem and sheath at maturity, which resulted in a low harvest index.