Responses of leaf functional traits and biomass of Quercus acutissima and Phoebe bournei seedings to light and fertilization

The light and nutrient conditions are important environmental factors that affect plant growth, and plants of different life forms have different responses mechanisms to environmental heterogeneity. The seedlings of the deciduous broad-leaved tree species Quercus acutissima Carruth. and the evergreen broad-leaved tree species Phoebe bournei(Hemsl.) Yang were selected as the research objects, and a total of 8 treatments were formed by setting 2 light gradients(the full light and 45% full light) and 4 fertilization gradients(no fertilization, the nitrogen and phosphorus supply ratio of 5, 15 and 45). In this paper, we study the effects of light, fertilization and their interaction on the biomass and leaf morphology, physiological and chemical properties of the Quercus acutissima and Phoebe bournei, and explore the relationship between leaf functional traits and plant biomass. The results showed that:(1) light, fertilization and their interaction had significant effects on photosynthetic gas exchange parameters(except for water use efficiency), chlorophyll fluorescence parameters, leaf morphology indicators(Un-including specific leaf area), unit mass leaf nitrogen content, and root shoot ratio. In addition, light and fertilization showed significant impacts on above ground biomass and total biomass(P