【摘要】 研究了山东省 14个冬小麦高产品种 (系 )的冠层结构和光截获 (L I)及分布特性。结果表明 :参试材料间盛花期冠层消光系数 K存在显著差异。中下层叶片相对光强 (I/ I0 )的差异程度大于上层叶片。适度的增加上部节间长、提高株高构成指数 (IL)、降低上层叶片面积所占比例和角度指数 ,有助于减小冠层 K并改善透光条件。盛花期 L I及分布特性对作物生长率 (CGR)、籽粒形成及最终产量有重要影响。并对小麦冠层结构改良和研究的有关问题进行了探讨。更多还原

【Abstract】 The characteristics of canopy architecture and light interception were studied with major winter wheat cultivars (lines) in Shandong Province. The results showed that there is a significant difference in attenuation coefficient (K) among examined genotypes. The difference in relative radiation intensity (I/I 0) of the middle and lower leaves among cultivars was larger than that of the upper layer. The results also indicated that appropriate increase of the length of upper stem internode and plant height component index (I L), or appropriate decrease of the angle index(α) and the percentage of the upper leaf area, will contribute to reduce K value and improve light transmission of canopy. Light interception and distribution in canopy at anthesis stage played an important rule in crop growth rate (CGR), kernel formation and economic yield per area. Some questions related to wheat canopy improvement and research were discussed.更多还原