桂西南米老排人工林单株生物量回归模型

通过对桂西南大青山林区28a生米老排(Mytilaria laosensis)人工林林分进行每木检尺和生物量的测定,建立了米老排各器官生物量与胸径、树高和胸径平方乘树高(D2 H)的相关关系;分别选用幂函数等5种模型,用回归分析方法对米老排人工林单株生物量模型进行了拟合。结果表明:树叶和树根生物量分别与胸径和树高的相关关系最显著,而树干、树枝、树皮和全株的生物量都与D2 H的相关关系最为显著。胸径、树高和D2 H与各器官生物量拟合的模型中,全株、树干和树皮的拟合效果最好,树叶和树根的拟合效果中等,树枝的拟合效果较差。除树皮外,各器官均以幂指数模型的拟合效果最好。

Individual Biomass Regression Model of Mytilaria laosensis in Southwest of Guangxi

Based on the inventory data of a 28-years-old Mytilaria laosensis plantation and the biomass measurements of the mean sample trees,the correlation between diameter at breast height(DBH),tree height(H),D2H and different parts of an individual tree were analyzed.Five biomass models,including power function model of individual tree of Mytilaria laosensis in southwest of Guangxi province were established by regression analysis.The results showed that the relationships between stem,branch,bark,total biomass and D2H were significant while the relationships between leaf biomass and DBH and between root biomass and H were significant.In the models in which the independent variable is the DBH(D),tree height(H) and D2H respectively,total tree,trunk,and bark biomass recession models were fitted best,leaf and root biomass recession models were fitted moderately,and branch biomass recession model were fitted worst.Power function model was the best regression model for fitting biomass of the most parts of an individual tree except bark biomass.