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高产水稻群体结构可分为三层.上层为“高Pn层”,中层为“高效层”,下层为“低Pn维持层”.提高群体光能利用效率应着眼于提高上层Pn和中层的量子效率,关键是控制中、上层LAI达到最适(4～5之间),使群体内各层光有一个最佳分布.中层透光值Q=260μEM~(-2)S~(-1),相当1.5万Lux.不同生育期不同叶位叶的光-光合曲线均表现在此光强下量子效率最高.因此,这个数值可作为中层理想透光度的指标,也可作为制定合理栽培措施的依据.
The population structure of high yielding rice can be divided into three layers: the upper layer is “high Pn layer”, the middle layer is “high layer” and the lower layer is “low Pn layer.” Increasing the population’s light energy utilization efficiency should focus on improving the upper Pn and middle quantum Efficiency, the key is to control the upper LAI to achieve the best (between 4 to 5), so that the light within the group has an optimal distribution of the middle layer of light transmittance Q = 260μEM ~ (-2) S ~ (-1) , Equivalent to 15000 Lux. The photosynthesis curves of leaves at different growth stages showed the highest quantum efficiency under this light intensity, therefore, this value could be used as an index of the ideal light transmittance of middle layer and also as a reasonable cultivation measure The basis.