Abstract: Based on the measurements of leaf photosynthesis, the light response curves of Pinus koraiensis, Tilia amurensis, Quercus mongolica and Fraxinus mandshuricaphotosynthesis in broadleaved Korean pine forest of Changbai Mountains were fitted with rectangle and non-rectangle hyperbolae. The results showed that rectangle hyperbola was simpler for fitting, while non-rectangle hyperbola was more reasomable because of its fitted results better matched physiological meanings. The values of intrinsic quantum efficiency for CO₂ uptake (α), light-saturated net photosynthetic rate (P_max), and dark respiration rate (R_d) of the four tree species were higher when fitted with rectangle hyperbola than with non-rectangle hyperbola, while that of light compensation point (L_cp) varied with tree species. The values of α and R_d obtained from the two hyperbolae had the same sequences, i.e., F. mandshurica＞T. amurensis＞Q. mongolica＞P. koraiensis for α, and F. mandshurica＞Q. mongolica＞T. amurensis＞P. koraiensis for R_d, but for P_max and L_cp, the sequences were not the same.

Key words: Moss, Lichen, Geochemical elements, Plant nutrient