Abstract
It provides a theoretical basis for the artificial promotion of the reproduction and regeneration of Liriodendron chinense through exploring the effects of light intensity and seeding density on the seed germination and seedling growth of this rare plant. Controlled experiments were conducted by setting different seeding densities and shading intensities to observe and detect the seed germination and seedling growth under different experimental conditions. The data were analyzed by SPSS and the model was fitted to calculate the seed germination rate, seedling emergence rate and seedling growth parameters of Liriodendron chinense, which were used to analyze the effects of seeding density and light intensity on the seed germination and seedling growth of Liriodendron chinense. Light has a significant impact on the seed germination and seedling growth of Liriodendron chinense (P P > 0.05). High density promotes the seedling height (the seedling height showed a rising trend with the increase of seeding density, reaching the highest at 500 seeds/m2. “3-stitch + 300 seeds/m2” combination is an appropriate condition for Liriodendron chinense reproduction since it can realize higher germination rate and better seedling growth potential. The seedling height and basal diameter growth curve of Liriodendron chinense fits well to the Logistic equation (R2 ≥ 0.977). Light has a significant impact on the seed germination and seedling growth of Liriodendron chinense, and appropriate shading treatment can increase the seed germination rate and seedling emergence rate of Liriodendron chinense. Seeding density has little influence on the seed germination rate of Liriodendron chinense, but high density will promote seedling height.
Highlights
Liriodendron chinense, an arbor species of Liriodendron in Magnoliaceae, is an ancient relic plant and one of the unique, rare and endangered species in China
The data were analyzed by SPSS and the model was fitted to calculate the seed germination rate, seedling emergence rate and seedling growth parameters of Liriodendron chinense, which were used to analyze the effects of seeding density and light intensity on the seed germination and seedling growth of Liriodendron chinense
Light has a significant impact on the seed germination and seedling growth of Liriodendron chinense (P < 0.01), while seeding density has no remarkable effect on the same (P > 0.05)
Summary
Liriodendron chinense, an arbor species of Liriodendron in Magnoliaceae, is an ancient relic plant and one of the unique, rare and endangered species in China. In the long natural succession, natural forests of Liriodendron chinense are limited to Guizhou, Hubei, Hunan, Chongqing, Sichuan and other areas south of the Yangtze River [1] due to the endangering habitats, fierce interspecific competition within natural communities, low seed vitality and parthenogenesis, heavy deforestation and other reasons [2]. According the practical investigation, there are few naturally regenerated Liriodendron chinense seedlings or saplings in the natural forests of Liriodendron chinense. Seed germination and seedling establishment are the most fundamental steps in the process of plant growth and development, and are subject to many factors. This study, by simulating the habitat conditions of Liriodendron chinense natural forests, discusses the factors facilitating seed germination and seedling growth, which is significant for the natural regeneration of Liriodendron chinense
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