Abstract:

The biomass productivity of different generation plantations of Chinese fir was studied through the investigation of different generation, age and site plantations. The results are as follows:Successive planting results in significant biomass productivity decline of different aged plantations of Chinese fir.As planting generation increases, the stand biomasses of different aged plantations decrease, whereas underground vegetation biomasses increase. Compared to the first generation plantation, the stand biomasses of the second generation and the third generation plantations of 20-year-old decrease by 20.24% and 38.09% respectively. The stand biomass of the third generation plantation of 20-year-old decrease 22.3% compared to the second generation plantation.Moreover, proportions of stem biomass decrease proportions of root biomass increase along with increase of planting generation. Successive planting simulates develop of root and underground vegetation of Chinese fir plantations.

Key words: Planting generation, Chinese fir, Productivity, Biomass