中国西南地区栎类和桦木立木地上及地下生物量模型研建

依据中国西南地区栎类和桦木的立木材积及生物量实测数据,采用度量误差模型的方法,建立栎类和桦木材积相容的地上生物量及地下生物量模型。结果表明,在地上生物量模型中,增加树高因子,立木材积模型的相关统计指标有较大幅度的改进,栎类和桦木二元材积模型的平均预估精度分别达到了97.86%和97.08%,而二元地上生物量模型的相关统计指标并没明显的改进;两树种一元与二元地下生物量模型的相关统计指标差异并不明显,平均预估精度均达到了90%以上。

Establishment of Single-tree Above-ground and Below-ground Biomass Models for Quercus and Birch in the Southwestern China

Based on the tree volume and above-ground biomass data of Quercus and Birch in southwestern Chi-na,single-tree biomass models systems of Quercus and Birch （including the compatible tree volume and above-ground biomass model and below-ground biomass model）were constructed by using the error-in-variable simul-taneous equations. The results showed that：1 ）The regressions of volume equations improved significantly when tree height was used together with diameter at breast height （DBH）,through the two variables-based equa-tions,the prediction precision of tree volume of Quercus and Birch were 97.86% and 97.08% respectively, while the regressions of biomass equations improved slightly. 2）The difference was slightly small between one variable-based below-ground biomass model and two variables-based model. The prediction precision of below-ground model was more than 90%.