论文部分内容阅读
在群体水培条件下,2001、2002年分别以88、122个常规籼稻品种为材料,测定叶面积、干物重(包括根系)、产量及其构成因素、氮素含量等,采用组内最小平方和的动态聚类方法将供试品种按单穗重从低到高依次分为A、B、C、D、E、F 6类,研究各类品种物质生产与分配的差异及其原因。结果表明:①大穗型籼稻品种抽穗期、结实期、成熟期群体干物质生产量和个体干物质生产量大;②大穗型品种成熟期茎鞘干重比例较大,穗干重比例及经济系数小于中等穗型品种;③单穗重受生物产量和经济系数的共同影响,生物产量特别是单穗生物量对穗重的作用显著大于经济系数对穗重的作用;④大穗型水稻品种播种到抽穗天数、全生育期天数较长,生育期、干物质生长率均是影响干物质生产的重要因素,干物质生长率特别是个体干物质生长率对干物质生长量影响较大;⑤大穗型品种单穗茎鞘重、单穗绿叶重、单穗叶面积大,结实期单穗叶面积下降速度慢。单穗根源、单穗氮源、单穗叶源、单穗碳源优势明显是大穗型品种干物质积累多、穗重大的主要原因。
Under the condition of population hydroponics, the leaf area, dry weight (including root system), yield and its components, nitrogen content and so on were determined by using 88,122 conventional indica rice varieties from 2001 to 2002 respectively. The dynamic clustering methods were divided into A, B, C, D, E and F classes according to single panicle weight from low to high, and the differences and their causes of production and distribution of various varieties were studied. The results showed that: (1) Large-panicle cultivars had a large amount of dry matter production and individual dry matter production at heading, setting and maturity stages. (2) The economic coefficient is less than that of the middle ear type; ③ The single ear weight is affected by both the biological yield and the economic coefficient, and the effect of the biological yield, especially the single ear biomass on the ear weight is significantly greater than that of the economic coefficient on the ear weight; The days of sowing to heading, the longer days of the whole growth period, growth period and dry matter growth rate were the important factors affecting the dry matter production. The dry matter growth rate, especially the individual dry matter growth rate, had a significant effect on the dry matter growth. ⑤ Large panicle type single panicle sheath weight, single leaf green leaf weight, single panicle leaf area, grain yield per panicle declining area slow. The main source of single spike, single spike nitrogen, single spike leaf, single spike carbon source is obviously the main reason of large dry matter accumulation and large spike weight of big spike type.