Vegetation Data, Eucalyptus obliqua, Biomass Determination, Warra Tall Eucalypt SuperSite, 2003

Destructive sampling of 47 Eucalyptus obliqua trees was carried out to determine a range of biomass measures that can be used to inform allometric equations. Method Step Description The same sequence of activities was followed for each tree harvested in this study: a) Selection of trees: the trees were selected by personnel from State Forests of NSW and Forestry Tasmania to reflect as closely as possible the range and quality of trees that are harvested during a commercial harvesting operation in that area. b) Measurement of tree DBH. c) Felling of the tree using a chainsaw. d) Measurement of the length of the tree and stump height. e) Transport of the logs and crown from the forest to the log dump by an excavator. f) Weight of the crown: the crown was lifted by the excavator and placed on a platform placed on top of the weight bars to allow measurement of material shorter than the span between the weigh bars. g) Weight of full-length log (still with the bark on): the logs were placed on top of hardwood beams placed on the weigh bars to optimise load sharing. Some logs exceeded the capacity of the weigh bars; in those cases, they were either split or shortened and each component measured separately. h) Debarking of the log (by the excavator). i) Weight of the main log (debarked), as in “g”. j) Sampling of the log: disks were cut at both ends of the log for laboratory analyses, after the outermost sections were discarded. The disks were put in sealed plastic bags. k) Grading and cutting of the log into log products. The log product categories used were: sawlog, veneer logs and pulp. l) Measurement of length and diameters at both ends of each log product. m) Weight of each log product as in “g”. n) Sampling of crown: random samples were cut with the chainsaw and placed in sealed plastic bags. A visual assessment was undertaken to estimate any losses (crown material and bark) that may have occurred during to transport of each crown and log from the forest to the log dump.

本研究对47株斜叶桉（Eucalyptus obliqua）开展破坏性取样，以获取一系列可用于构建异速生长方程的生物量测定数据。
方法步骤说明
本研究中所有采伐林木均遵循统一操作流程，具体如下：
a) 样木选取：新南威尔士州林业局（State Forests of NSW）与塔斯马尼亚林业公司（Forestry Tasmania）的工作人员选取样木，尽可能贴合该区域商业采伐作业中采伐林木的规格与品质范围。
b) 测定林木胸径（DBH）。
c) 使用链锯采伐林木。
d) 测定林木全长及伐桩高度。
e) 利用挖掘机将原木与树冠从林地转运至贮木场。
f) 树冠称重：通过挖掘机将树冠吊起，放置于架设在称重杆上方的称重平台上，以便测量跨度小于称重杆间距的物料。
g) 带皮全长原木称重：将原木放置于架设在称重杆上的硬木横梁上，优化载荷分布。部分原木超出称重杆量程，此时需将其拆分或截断，分别称量各组分重量。
h) 由挖掘机完成原木去皮作业。
i) 去皮后主原木称重，操作流程同步骤g。
j) 原木取样：舍弃最外层区段后，在原木两端截取圆盘供实验室分析，将圆盘装入密封塑料袋中。
k) 原木分级与截断，划分为三类产品：锯材原木、单板原木与纸浆材。
l) 测定每类原木产品的长度及两端直径。
m) 每类原木产品的称重，操作流程同步骤g。
n) 树冠取样：使用链锯随机截取树冠样品，装入密封塑料袋中。同时开展目视评估，估算每批树冠与原木从林地转运至贮木场过程中产生的损耗（含树冠物料与树皮）。