Study On Biomass Of Platyclatdus Orientalis Plantation In Xuzhou

Biomass and productivity are critical parameters assessing forest carbon sequestration capability and the quantitative estimates are required for forest biomass carbon accounting. Study on biomass, effect factors, thinning effect to biomass and carbon storage of the 50 years old Platyclatdus orientalis plantations in the Limestone Mountains of Xuzhou, the results showed that:(1) Biomass for a whole tree was in a range of 8.88-80.71kg.Allocation of biomass to organs followed a sequence of trunk>branch>root>leaves or trunk>branch>leaves>root; Significant correlations were found between organ biomass and diameter at breast height or D2H.Biomass for stands of 8 plots was in the range of 28.92 t/hm2-75.42 t/hm2,the mean of which was 54.35 t/hm2.(2) Biomass for stands was positively correlated with the north aspect index, while other factors were fewer effective. The response curves of biomass or aboveground biomass to stand density were both unimodal. Biomass and aboveground biomass had the maximum value when stand density closed to 2600 individual/hm2.(3)Total biomass of the control plots is lower than first thinning plots but higher than second thinning plots. Both the original thinning and secondary thinning increase the proportion of the trunks; After each thinning, individual biomass is higher than the control plots; The biomass allocation among different DBH classes was concentrated in the small classes, after each thinning, the biomass allocation among large classes.(4)The total carbon storage of 5 plots was in the range of 46.66t/hm2 to 76.77t/hm2, the mean of which was 64.79t/hm2. Carbon storage of different organs was in order as follow: stem >branch> root > leaves. The carbon storage in the vegetation was 42.01 t/hm2, accounted for 22.77%,and the carbon storage in the soil was 64.79 t/hm2,account for 42.01%.