ABSTRACT

The present study carried out with a field plot experiment and light environment simulation experiment in 2017 to assess the effect of spectral distribution on internode elongation in soybean canopy. Henong 60 and Heinong 48 were used as the experimental materials. The spectral distribution in the soybean canopy was studied under four planting densities 200,000(D20), 300,000(D30), 400,000(D40) and 500,000(D50) plant ha⁻¹. Meanwhile, a pot experiment of light environment simulation with light-emitting diode (LED) was carried out to further analyze the effects of light quantity and quality on the elongation of soybean seedlings. The results showed that the intensity of PAR, blue light, red light and far-red light in soybean canopy decreased by varying degrees with density and canopy depth increasing, and the decrease of PAR and R/FR led to significant elongation of internodes and plant height in high density. The spectral intensity in the middle and base of the canopy was strongly reduced, resulting in the strongest internode elongation in the middle of soybean stem. The increase in soybean plant height was also mainly due to the internode elongation in the middle at high density. In addition, the mono-light of far-red light could promote the internode elongation, while the red light and blue light acted as inhibitors and the inhibitory effect of blue light was even greater.

摘要

本研究于 2017 年通过田间小区实验和光环境模拟实验进行，以评估光谱分布对大豆冠层节间伸长率的影响。实验材料为河农 60 和河农 48。在四种种植密度下研究了大豆冠层中的光谱分布 200,000(D20)、300,000(D30)、400,000(D40) 和 500,000(D50) 植物 ha ^-1. 同时，通过发光二极管（LED）模拟光环境盆栽试验，进一步分析光量和质量对大豆幼苗伸长率的影响。结果表明，大豆冠层的PAR、蓝光、红光和远红光强度随密度和冠层深度的增加而不同程度降低，PAR和R/FR的降低导致节间和植株显着伸长。高密度的高度。冠层中部和基部的光谱强度强烈减弱，导致大豆茎中部的节间伸长最强。大豆株高的增加也主要是由于高密度中间节间伸长。此外，远红光的单光可以促进节间伸长，