海南岛桉树相容性生物量模型的研究

为建立更加准确的桉树单木生物量模型，并为准确估算海南岛桉树人工林生物量提供方法，以海南岛桉树 90 株样木的生物量实测数据为基础，利用非线性度量误差联立方程组方法，建立了桉树相容性生物量方程，采用分级联合估计方法进行了全树生物量与 6 个组分（树干、地上部分、树枝、树叶、树冠、根系）的相容性生物量的估计。结果表明：所建的一元、二元相容性生物量模型的确定系数均在 0.85 以上，最高达 0.99，在胸径基础上增加树高变量对改进生物量的预估效果不显著。与独立生物量模型相比，相容性模型的预估效果较独立模型好，随着解释变量的增加，对根系生物量的拟合效果改进尤为凸显。总体而言，相容性模型基本满足森林生物量计量的精度要求，研究结果在确定国家温室气体清单的森林碳储量和海南省 LULUCF 碳汇计量监测方面具有重要意义。

Compatibility Biomass Model of Eucalyptus in Hainan Island

The purpose of this paper is to establish a more accurate biomass model for eucalyptus trees, and provide a method for accurately estimating the biomass of eucalyptus plantations in Hainan Island. In this paper, a combined biomass model of eucalyptus tree biomass and six components (tree trunk, aboveground part, branch, leaf, crown, root) was established by the combined estimation method. These models are derived from the measurement data of 90 samples of eucalyptus in Hainan Island. The results showed that the determination coefficients of the biocompatible biomass the estimated biomass on the basis of DBH was not significant. Compared with the independent biomass model, the prediction effect of the compatibility model is better than that of the independent model. With the increase of the explanatory variables, the improvement of the fitting effect of the root biomass is particularly prominent. In general, these compatibility models meet the precision requirements of forest biomass measurement, and the results have important significance to determine the forest carbon reserves of the national greenhouse gas list and the calculation results of LULUCF carbon sequestration in Hainan province.