北方旱稻的叶层结构和后期光分布

The Architecture of Foliage layer and the Light Distribution at Late Stage in Upland Rice in the North

为了探讨旱地条件下旱稻品种叶层结构的特点,1986,1987年两年在北京农业大学种植3个旱稻品种,其中有生育期较长的“秦爱”;生育期中等的“石狩”;生育期较短的“小白旱稻”。不同生育期按Ross的群体结构分析法研究了叶层结构。结果表明“秦爱”是高杆中等偏直立型;“石狩”为矮杆直立型;“小白旱稻”属于矮杆型,株型随生育期变化,穗首分化期至抽穗期呈中等偏直立型,灌浆中期却呈披散型。3个品种叶片着生方位基本是均匀分布的,后期群体内光分布各有不同。

This study was conducted with the objective of probing the characteristics of the architecture of foliage layer in upland rice, cultivated at dryland condition in Beijing Agricultural University from 1986 to 1987, using three varieties of upland rice including Qin Ai with long growth duration; Shi Shou with middle growth duration; and Xiao Bai Han Dao with short growth duration, by Ross's method for analyzing the canopy structure at the different stages. The results showed that Qin Ai's plant type was erect middle tall type, Shi Shou's was erect dwarf type and the Xiao Bai Han Dao was dwarf variety, its plant type changed following growth duration, it showed erect middle type from bract differentiation to heading stage, but it presented drooping loose type at middle milking stage. The distribution of foliage orientation of these three varieties was fundamentally uniform, but the distribution of light of them in canopy at late stage was different respectively.