Hamilton2005
Data contributor: Steve Hamilton
Email: Steve.Hamilton@hamiltonenviro.com.au
Address:
- Hamilton Environmental Service, 2345 Benalla-Tatong Road, Tatong VIC 3673, Australia
Citation: Hamilton SD, Brodie G and O'Dwyer C (2005). 'Allometric relationships for estimating biomass in grey box (Eucalyptus microcarpa).' Australian Forestry, 68(4), pp. 267-273.
DOI: 10.1080/00049158.2005.10674976
Abstract: Summary A procedure is described for obtaining allometric relationships between stem diameter and aboveground biomass for grey box. Eucalyptus microcarpa. a commonly occurring tree in the Victorian and New South Wales Riverina. While usually having a single trunk, a significant proportion of grey box individuals have multiple stems from near the ground. This is an artifact of enhanced epicormic growth when juvenile, often resulting from stock grazing disturbance. The procedure treats each stem formed from below 30 cm above ground as a discrete tree that shares a proportion of the butt and other elements common to all stems. Significant allometric relationships, using both the commonly-applied log-transformed method, and a recently proposed additive error method, were developed between stem diameter at breast height and at 30 cm above ground, tree height and width, and the dry weights of each aboveground component. These relationships were similar to those previously obtained for single-stemmed trees in southern Australia.
The dataset includes records for 18 individuals from 1 species belonging to 1 family(ies), presenting 1 functional type(s), growing in 1 condition(s) within 1 major type(s) of habitat, with data included for the following variables:
| Variable | Label | Units | N | Min | Median | Max |
|---|---|---|---|---|---|---|
| latitude | Latitude | deg | 18 | -36 | -36 | -36 |
| longitude | Longitude | deg | 18 | 146 | 146 | 146 |
| a.stbh | Stem area at breast height | m2 | 18 | 0.0028 | 0.097 | 0.8 |
| a.cp | Crown area | m2 | 18 | 0.64 | 75 | 191 |
| h.t | Height | m | 18 | 6.3 | 14 | 20 |
| d.bh | Dbh | m | 18 | 0.06 | 0.35 | 1 |
| h.bh | Height of d.bh measurement | m | 18 | 1.3 | 1.3 | 1.3 |
| d.cr | Crown width | m | 18 | 0.9 | 9.8 | 16 |
| m.lf | Leaf mass | kg | 18 | 0.2 | 19 | 79 |
| m.sb | Bark mass | kg | 18 | 3.5 | 94 | 788 |
| m.br | Branch mass | kg | 18 | 1.9 | 97 | 1038 |
| m.to | Total mass | kg | 18 | 16 | 594 | 7410 |
And locally within the country:
The sites sampled are:
| Location | Longitude | Latitude | Vegetation |
|---|---|---|---|
| Dookie Bushland Reserve, University of Melbourne, Dookie, Victoria, Australia | 145.683 | -36.4 | Woodland |
The growing conditions of sampled plants was:
| Location | growingCondition |
|---|---|
| Dookie Bushland Reserve, University of Melbourne, Dookie, Victoria, Australia | field wild |
| Species | Family | Pft |
|---|---|---|
| Eucalyptus microcarpa | Myrtaceae | evergreen angiosperm |
Sampling strategy: A total of 18 trees were sampled for estimation of overstory biomass, and to aid the development of allometric relationships for Eucalyptus microcarpa, across the range of tree sizes found within the area of the Dookie Forest Reserve. Larger trees were oppportunisticly sampled (for example, after storm damage) through the period July 1996 to June 1998, and smaller trees were deliberately felled in July 1996. Sampling strategy entailed treating.
Stem cross sectional area: Stem diameter was measured at 30 cm aboveground, along with the length and diameter of the main stem at its apex.
Height: Height was measured as the vertical distance from the ground surface to the highest apex of each tree (or stem).
Crown area: Crown width was measured at right angles, including the widest width.
Biomass: Harvested material from a given stem was separated into leaves, twigs and branches. Branchwood and branchbark were further separated into individual components. The fresh weight of all material above 20 kg was determined using a weighbridge, while all material under 20 kg was measured on a desktop scale. Sub-samples of all fresh material were taken randomly, then dried to current weight at 80 degC, and the dry weight to fresh weight ratio determined.
Traits: Wood density was obtained using increment corer samples, and by the water displacement method. Regression equations (for aboveground biomass) were developed by relating the dry weight of individual tree components and total tree aboveground weight to diameter measurements (see Reference article for more details on both).
Growth environment: Field, wild.
This is how the study Hamilton2005 fits in the entire dataset (grey). each colour represents a species. A legend of species names with colours is included at the end for reports with 1 < n < 20 species.
