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首页> 美国卫生研究院文献>Scientific Reports >Resource use efficiency of indoor lettuce (Lactuca sativa L.) cultivation as affected by red:blue ratio provided by LED lighting
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Resource use efficiency of indoor lettuce (Lactuca sativa L.) cultivation as affected by red:blue ratio provided by LED lighting

机译：室内生菜栽培的资源利用效率受LED照明提供的红蓝比率的影响

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LED lighting in indoor farming systems allows to modulate the spectrum to fit plant needs. Red (R) and blue (B) lights are often used, being highly active for photosynthesis. The effect of R and B spectral components on lettuce plant physiology and biochemistry and resource use efficiency were studied. Five red:blue (RB) ratios (0.5-1-2-3-4) supplied by LED and a fluorescent control (RB = 1) were tested in six experiments in controlled conditions (PPFD = 215 μmol m−2 s−1, daylength 16 h). LED lighting increased yield (1.6 folds) and energy use efficiency (2.8 folds) as compared with fluorescent lamps. Adoption of RB = 3 maximised yield (by 2 folds as compared with RB = 0.5), also increasing leaf chlorophyll and flavonoids concentrations and the uptake of nitrogen, phosphorus, potassium and magnesium. As the red portion of the spectrum increased, photosystem II quantum efficiency decreased but transpiration decreased more rapidly, resulting in increased water use efficiency up to RB = 3 (75 g FW L−1 H2O). The transpiration decrease was accompanied by lower stomatal conductance, which was associated to lower stomatal density, despite an increased stomatal size. Both energy and land surface use efficiency were highest at RB ≥ 3. We hereby suggest a RB ratio of 3 for sustainable indoor lettuce cultivation.
机译：室内耕作系统中的LED照明可以调节光谱以适应植物的需求。经常使用红（R）和蓝（B）灯，它们对于光合作用非常活跃。研究了R和B光谱成分对莴苣植物生理生化和资源利用效率的影响。在受控条件下（PPFD = 215μmolm s -1 ，日长16 h）。与荧光灯相比，LED照明提高了产量（1.6倍）和能源利用效率（2.8倍）。采用RB = 3可使产量最大化（与RB = 0.5相比增加2倍），也增加了叶绿素和类黄酮的浓度，并吸收了氮，磷，钾和镁。随着光谱红色部分的增加，光系统II的量子效率下降，但蒸腾作用下降得更快，从而导致水利用效率提高到RB = 3（75 g FW L -1 H2O）。尽管气孔大小增加，但蒸腾作用的减少伴随着气孔导度的降低，这与气孔密度的降低有关。能量和土地利用效率均在RBland≥3时最高，因此我们建议可持续室内生菜种植的RB比为3。

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