品种与播期对齐穗期水稻群体光能截获量和干物质垂直分布的影响

为探讨不同类型水稻品种和播期对水稻群体光能截获量及干物质垂直分布的影响，以超级杂交稻、普通杂交稻和常规稻的3个品种为材料进行研究，结果表明：无论是品种还是播期，至齐穗期水稻群体各高度层的干物质积累量都表现出20cm以下＞80cm以上＞20～40cm＞40～60cm＞60～80cm；品种间表现为汕优63（V2）＞两优293（V1）＞扬稻6号（V3）。水稻群体消光系数(K)在同一播期的不同品种之间表现出汕优63（V2）＞两优293（V1）＞扬稻6号（V3），相同品种不同的播期之间表现出播期2（S2）＞播期1（S1）＞播期3（S3）的变化规律。

EFFECTS OF DIFFERENT TYPED RICE VARIETIES AND SOWING DATES ON SOLAR RADIATION AND VERTICAL DISTRIBUTION OF DRY MATTER IN RICE POPULATION

Three types of rice varieties including Liangyou 293,Shanyou 63 and Yangdao 6 were used to explore the effects of rice varieties and sowing date on solar radiation interception and the vertical distribution of dry matters in rice population.The results showed that differences in dry matters at different vertical heights of rice population were caused by both sowing date and varieties.Dry matters at different heights below the 20 cm,above the 80 cm,20～40 cm,40～60 cm and 60～80 cmperformed a progressive decrease,so did the dry matters of Shanyou 63,Liangyou 293 and Yangdao 6.Extinction coefficient (K)of Shanyou 63,Liangyou 293 and Yangdao 6 performed a progressive decrease with the same sowing date,so did the extinction coefficient(K)of the 2nd sowing date(S2),the 1st sowing date(S1)and the 3rd sowing date(S3)with the same yariety.