汕优63群体叶面积动态研究

Studies on Leaf Area Dynamics of Population in Hybrid Rice

本研究结果得出:1、在合理群体下,顶2～3叶较长而挺立,倒4～5叶和基部节间较短,上位二个节间较长的株型(Ⅳ型),更有利于改善冠层光分布,提高生育后期主要光合叶片的效能,产量更高。2、水稻生育进程群体叶面积动态可以方程描述(R>0.97),并可分为五种类型,Ⅳ型是可获高产的合理模型。

The following results have been obtained from the present study. i). In a reasonalbe population it was of more benefit to the improvement of light distribution in canopy and the increment of leaf photosynthetic rate after heading, therefore beneficial to the achievement of high grain yield, that rice had a plant-type of leaf 1-2 from top relatively long and upright, internodes 1-2 from top longer, but leaf 4-5 from top and lower internodes relatively short (IV-type), ii). The developing process of LAI on the days after transplanting could be expressed as (R > 0.97)Y =K/1+e^(a+bx+cx^2) The leaf area developmental model of dif- ferent treatments could be divided into five types according to the leaf area dynamic characteristics of main rice growth phases. The IV-type was recognized as a reasonable leaf area dynamic model of population for high grain yield.