闽北邓恩桉人工林生物量的分配规律

A study on distribution of biomass for Eucalyptus dunnii plantation in northern Fujian Province

以闽北邓恩桉人工林为研究对象,建立了邓恩桉各器官生物量与胸径、树高的回归模型,并筛选出各自的最优模型,然后以生物量模型来估算邓恩桉的生物量,以揭示闽北邓恩桉人工林生物量的分配规律。结果表明:3个邓恩桉林分各器官生物量垂直分布总体趋势一致,但不同林分的长势差异使邓恩桉生物量在垂直高度的分配比例上发生明显的变化。其中山地林2邓恩桉在树高1/2以下的树干生物量所占比例最大,山地林1次之,河岸林的最小,但河岸林邓恩桉各器官的生物量是最大的;树叶生物量大多集中分布在树冠的中上部;邓恩桉人工林中生物量及材积的径阶分布有明显的规律。

The plantation of Eucalyptus dunnii was used as the research object in this study. The SPSS analysis software was adopted to establish regression model between organ biomass and DBH,height of E. dunnii,and the optimal model was selected to reveal the distribution regularity of biomass of Eucalyptus plantation. The results showed that the vertical distribution of overall trend for biomass of each organ was consistent in three plantations,but growth differences of different plantations made a variation of biomass in E. dunnii in the distribution of different vertical height. The trunk biomass below l /2 of tree height in mountain forest 2 was the biggest,mountain forest 1 was the second,riparian forest was the smallest. But biomass of all different organs was the biggest in riparian forest. Biomass of leaves was distributed in the middle of canopy. The biomass and volume of E. dunnii plantation showed obvious regularity of the distribution for diameter order.