Study on the Biomass of Castanopsis eyrei Community Dominant Species in Leigongshan Mountain of Guizhou

In order to explore the biomass characteristics of dominant species of evergreen broad- leaved forest in Leigongshan mountain of Guizhou province,the basic characteristics of the typical vegetation Castanopsis eyrei(Champ.) Tutch. community was verified based on sample- plot survey,also two evergreen dominant species, i. e.,C. eyrei and R. stamineum,were chosed to research their biomass allocation characteristics and biomass models. The results were summarized as follows. The biomass of stem,branch,and leaf of average single C. eyrei tree in the community were 12. 96 kg,4. 65 kg,and 2. 08 kg,respectively,and those of R. stamineum were 15. 85 kg, 7. 77 kg,and 1. 64 kg,respectively. The proportions of different components accounting for the whole aboveground biomass of individual C. eyrei were: tree stem(53. 21%) tree branch( 23. 84%) tree leaf( 12. 68%),and those of R. stamineum were: tree stem( 54. 79%) tree branch(31. 10%) tree leaf(10. 90%). According to the biomass models fitting results,single- factor model(W = aDb) and double- factor model(W = a(D2H) b) could both satisfy the precision in the fitting of individual components' biomass such as stem,bark,branch,leaf,but the precision of double- factor model was higher than single- factor model in fitting of the whole aboveground biomass.