Changing Regularity of Biomass and Productivity of Taiwania flousiana Plantation
He Bin, Diao Hailin(School of Forestry, Guangxi University, Nanning 530004, P. R. China); Huang Hengchuan(Shankou Forest Farm of Nandan County, Guangxi Province); Huang Chengbiao(Guangxi University); Huang Haizhong, Cao Ming, Wei Mingbao(Shankou Forest Farm of Nandan County, Guangxi Province)
An experiment was conducted to study the biomass and productivity as well as their changes with growth of stands in Taiwania flousiana plantations of three different stand ages (8-year-old, 14-year-old and 28-year-old) in Shankou Forest Farm of Nandan County, Guangxi Province. Results showed that with stand age increasing, biomasses of stand average tree and every organ (except leaf and dead branch) increased. The annual growth speed of biomass was the fastest at 14～28 years for stand average tree and the stand. The percentages of biomass of different organs were related with stand age, namely with stand age increasing, the percentages of stem biomass and bark biomass increased, while biomasses of leaf and living branch decreased. The percentages of organ biomass showed stembranchleaf or rootbark for 8-year-old and 14-year-old stands and stemrootbranchbarkleaf for 28-year-old ones. The biomass of T. flousiana stand increased with stand age. The arbor layer biomass of stands aged of 8, 14, 28 years were 60.17, 112.98 and 247.61 t·hm-2 respectively, including 26.92, 60.27, 155.72 t·hm-2 of economic biomass (stem), and the net productivities of the stands were 7.52, 8.07 and 8.84 t·hm-2·a-1 respectively. Similar change tendency was also found for undergrowth biomass.