Abstract Fast urbanization and population increase resulted in the demand for ornamental seedling supply in a high efficiency under the culture of continuous artificial lighting. Light emitting diode (LED) can be considered as the replacement of high-pressure sodium (HPS) lamps by providing lights with specific wavelengths for plant growth at low energy cost. In this study, nutrient use efficiency was detected in Podocarpus macrophyllus seedlings under lighting spectra generated by white light-emitting diodes (LEDs) (red (R)/green (G)/blue (B)=8.4:75:16.6) and high-pressure sodium (HPS) lamps (R/G/B/=4.3:69.3:26.5). Compared to seedlings under the HPS spectrum, those under white LED spectrum had better growth, greater biomass accumulation, higher photosynthesis and gas exchange. In contrast, LED-spectrum treated seedlings had greater nitrogen (N) and phosphorus (P) contents than HPS-spectrum treated ones. The LED spectrum promoted nutrient use index for both N and P in seedlings compared to the HPS spectrum. The LED spectrum induced steady-state uptake of P but resulted in the dilution of N. In conclusion, white LED can be considered to replace the usage of HPS lamps for the culture of tree seedlings due to the spectrum effect on N utilization, P uptake and the use efficiencies of N and P.

中文翻译：

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白光发光二极管对罗汉松幼苗光合作用及养分利用效率的光谱效应

摘要 快速的城市化和人口的增加导致了在连续人工照明培养下对观赏苗木高效供应的需求。发光二极管 (LED) 可以以较低的能源成本为植物生长提供具有特定波长的光，因此可以将其视为高压钠 (HPS) 灯的替代品。在本研究中，在白光发光二极管 (LED)（红（R）/绿（G）/蓝（B）=8.4:75:16.6）和高光光谱下检测到罗汉松幼苗的养分利用效率。 - 压力钠 (HPS) 灯 (R/G/B/=4.3:69.3:26.5)。与HPS光谱下的幼苗相比，白光LED光谱下的幼苗生长更好，生物量积累更大，光合作用和气体交换更高。相比之下，LED 光谱处理的幼苗比 HPS 光谱处理的幼苗具有更高的氮 (N) 和磷 (P) 含量。与 HPS 光谱相比，LED 光谱提高了幼苗中 N 和 P 的养分利用指数。LED 光谱诱导稳态 P 吸收，但导致 N 被稀释。 总之，由于光谱对 N 利用率、P 吸收的影响，白光 LED 可以考虑取代 HPS 灯用于树苗的培养以及 N 和 P 的利用效率。