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探究不同氮素供给对甘草根系呼吸及生物量积累的影响规律,揭示通过影响根系呼吸来调控甘草生物量积累的途径。在6月至10月,每7 d对控制环境条件下的甘草播种苗施用氮(N)浓度为0,0.5,1,2,4,8 mmol·L-1的全营养液,每月月底测定甘草不同级别根系呼吸速率及生物量,分析甘草根系生物量与呼吸速率的相关性。研究结果表明,氮素显著影响甘草根系呼吸速率和根系生物量积累,通过相对抑制生长呼吸速率以提高生物量而使两者呈负相关,并在8 mmol·L-1氮浓度处理时有最佳的抑制甘草根呼吸而提高根系生物量的效果。
The effects of different nitrogen supplies on the root respiration and biomass accumulation of Glycyrrhiza uralensis were explored, and the ways to regulate the biomass accumulation of Glycyrrhiza uralepis by affecting root respiration were revealed. From June to October, the whole nutrient solution with 0, 0.5, 1, 2, 4 and 8 mmol·L -1 nitrogen (N) concentrations was applied to licorice seedlings under controlled environmental conditions every 7 days. The root respiration rate and biomass of different levels of Glycyrrhiza uralensis were determined, and the correlation between root biomass and respiration rate was analyzed. The results showed that nitrogen significantly affected the root respiration rate and root biomass accumulation of Glycyrrhiza uralensis, and negatively correlated them by inhibiting the growth respiration rate and increasing the biomass, and was the most effective when treated with 8 mmol·L-1 nitrogen Good inhibition of licorice root respiration to improve root biomass.