Growth and Photosynthetic Physiological Characteristics of Seedlings of 4 Species of Myristicaceae

One-year-old seedlings of Horsfieldia glabra, Horsfieldia kingii, Horsfieldia pandurifolia and Knema furfuracea were used as test materials. The seedling growth, leaf traits and photosynthetic characteristics were measured and compared. The results show that the seedling height and ground diameter of 4 plant seedlings reach a very significant level, and the seedling growth order is Horsfieldia glabra> Horsfieldia kingii> Horsfieldia pandurifolia> Knema furfuracea. The leaf length, leaf width, leaf area, leaf thickness, specific leaf area and leaf vein density of the four seedlings are significantly different among species, and the order of leaf area is Horsfieldia kingii > Horsfieldia pandurifolia > Knema furfuracea > Horsfieldia glabra. And Sorting by the specific leaf area, it is as Horsfieldia pandurifolia > Horsfieldia glabra > Horsfieldia kingii > Knema furfuracea. P_nof Horsfieldia kingii is significantly higher than that of the other 3 species, Horsfieldia glabra and Horsfieldia pandurifolia is similarly moderate and Knema furfuracea is the lowest. Knema furfuracea and Horsfieldia glabra have higher LSP and lower LCP. And Knema furfuracea also shows higher instantaneous WUE_i of indicating Knema furfuracea has a wider range of environmental adaptation. Simultaneously, Knema furfuracea shows lower corresponding net photosynthetic rate, less leaves and dwarfed growth. Horsfieldia kingii and Horsfieldia pandurifolia exhibit relatively lower LSP, higher (P_{n, max}) and LCP as well as faster growth, but its has a narrow range of environmental adaptation.