刨花楠生物量及其结构动态分析

为了研究和预估刨花楠这一优良树种的各器官的生物量及其结构变化动态，选用四种模型分别对其树干，枝，叶，皮及地上部分总生物量进行拟合，并对拟合结果进行分析。结果表明：（1）刨花楠单木树干，树皮及地上部分生物量与胸径及树高两因子密切相关，且以模型2拟合为最优，树枝，树叶生物量则仅与胸径紧密相关，且以模型1拟合为最优；（2）30年的树木，其树干，树皮，树枝和树叶分别约占地上部分总生物量的66％，12％，19％和3％。（3）随着年龄的增大，刨花楠地上部分各器官生物量结构变化的趋势为；树干占地上部分总生物量的比较在30年前表现为增加，其中10年以前增加速度较快，在30年后表现为逐渐减少的趋势；树皮与树枝则一直表现为增加的态势，树叶则一直表现为下降的态势，其中15年以前下降速度较快。

The Dynamic Analysis of the Biomass and the Structure of Machilus Pauhoi

In this paper, four models are applied for researching and predicting the biomass of tree trunk, bark, branch, leave and all over-ground parts of an excellent species, Machilus pauhoi, and its results are analyzed. The results show:(1)The biomass of the tree trunk, bark and all over-ground parts is closely related to the two factors: D.B.H and tree height, and the second model is the best biomass model. The biomass of the tree branch and leaf is only closely related to D.B.H, and its best biomass model is the first model. (2)The biomass structure percentages of the tree trunk, bark, branch and leaf approximate 66%, 12%, 19% and 3% respectively. (3)With the age growth, the development trends of the structure percentages of all organs' biomass of the over-ground tree are as follows: The tree trunk biomass percentage of the over-ground tree rises up before 30a and the rising speed is faster than that before 10a. The percentages of the tree bark and branch always rise up. The percentage of the leaf always goes down and its falling speed is faster than that before 15a.