Biomass And Value Of Several Shrub Species In Dagang Mountain

The accurate determination of the biomass is the basis of in-depth study of the ecology and forestry issues.The shrub layer is an important structural component in the forest communities. It’s of great significance for the absorption,consumption, accumulation and transformation of the entire forest ecosystem material and energy to research on the shrub biomass. Currently,shrub biomass was primarily determined by the method of direct harvest inefficient and destructive. Consquently.it is significant to study on simple shrub biomass determination method-biomass model that is easy to measure the factors to estimate the bush organs and whole plant biomass.Taking three types of forests,evergreen broad-leaved,artificial fir,and Phyllostachys edulis in Nianzhu forest of Dagang mountain,as the research, object,we surveyed the height,basal diameter, crown range and dry and wet ratio of10species distributing more extensive in the shrub layer,then constructed the organs and the whole plant biomass models, with plant crown area (A),champions league volume (V),base diameter and plant height product (DH),base diameter square and plant height product (D2H) as the independent variable.Meanwhile,using optimal biomass model,combined with the investigative forest resources and the Type Ⅱ strains of forest inventory data in Nianzhu forestry station of Dagang mountain,we calculated biomass of the10kinds of shrub in the three forest types.Finally,on the basis of shrub biomass.we calculated the direct economic value,carbon fixation and oxygen values and the value of the accumulation of nutrients of shrub species in the three forest types.The results show that:The optimal biomass models of organs from a single species are mostly quadratic equation or cubic equation. The independent variable suiTab. for the optimal biomass model of leaves is usually V or A.while DH,D2H or V for trunk and branch, D2H and V for root. It is calculated that the total biomass of the10shrubs from the three types of forests are respectively1284.38kg/hm2.1088.08kg/hm2and968.13kg/hm2. Ten kinds of shrubs in the fir forest have the Maximum total economic value,followed by bamboo forest, while the minimum in the evergreen broad-leaved forest, which were respectively955138.73,9364703.28and2527468.39yuan.