Abstract: Based on the accurate measurement of 75 culms (25 culms for 1 a, 2 a and over 2 a, respectively), we established both mono-factorial and bi-factorial regression equations between above-ground whole & modular biomass and diameter and height of Fargesia nitida. Combining field investigation results with the constructed bi-factorial power regression models, we drew such conclusions as follows: 1) There was not significant difference in the above-ground biomass density of Fargesia nitida between calculated by regressing and measured, except for the biomass of the 1 a, which supported the feasibility of the models. 2) The total above-ground biomass density (DM base) of different age classes of Fargesia nitida in bamboo forest at Dengsheng in Wolong Nature Reserve investigated in spring 2005, winter 2005 and spring 2006 were 10.32, 10.56, and 12.68 t·hm^-2 , respectively, and the difference among the three was not significant. 3) The differences between the above-ground biomass density of 1 a, 2 a, or ≥3 a in winter 2005 and that in spring 2006 were not significant. 4) The difference between the above-ground modular biomass density of Fargesia nitida in winter 2005 and that in spring 2006 was not significant, except for the stem biomass density of bamboo over 2 annual (≥3 a).

Key words: Fargesia nitida, above-ground biomass, basal diameter, height, regression model (regression equation)