Brief description
The dataset comprises calculations of diameter, height, volume, biomass (total and carbon) of all stems (dead or alive) > 10cm diameter at breast height in the Core 1-ha plot at the Warra Tall Eucalypt siteNotes
Supplemental InformationThe dataset comprises an amalgamation of two surveys. The first survey was done in the original 1-ha core plot (now referred to as the Flux Tower Plot). Subsequently, a second survey was done in a 60 x 100 m extension to the western edge of the original 1-ha. Data for the new 1-ha core vegetation plot comprised measurements made in the 60 x 10 m extension and the western-most 40 m of the original 1-ha plot. The 60m extension was done to avoid the extensive disturbance associated with the installation of the Warra Flux tower in the eastern-most 60m of the original 1-ha plot.
Lineage
Tree survey:All individual stems ≥ 10 cm diameter at breast height (1.3 m) were mapped within the core 1ha plot. Diameter at breast height and plant height was recorded for all stems.
Tree volume calculations:
The volume of each stem was calculated using species species allometric equations.
Species volume allometric equations (source):
Acacia melanoxylon: (Forrester et al., 2004)
Dicksonia antarctica: (Beets et al., 2012)
Eucalyptus obliqua: (Forestry Tasmania inventory data)
Eucalyptus lucida: (Walker, B. B., & Candy, S. G., 1982)
Phyllocladus aspleniifolius: (Walker, B. B., & Candy, S. G., 1982)
Pomaderris apetala: (No published volume model. Used a conic volume (stem above 1.3 m) and cylindric volume (stem below 1.3m)
Atherosperma moschatum: (No published volume model. Used a conic volume (stem above 1.3 m) and cylindric volume (stem below 1.3m)
Nothofagus cunninghamii: (Harcomb et al., 1997)
Standing dead trees: (Sohn et al., 2013)
Tree biomass calculations:
The biomass of each stem was calculated using published species-specific basic density measurements and expansion factors to convert total stem volume to total above-ground biomass and carbon using the following formulae:
Standing biomass = Volume (m3) x basic density (tonnes/m3) x expansion factor
Species-specific equations:
A. melanoxylon: volume x 531 kg.m3 (Santos et al. 2012) x 1.46 (Snowdon et al., 2000)
Eucalyptus obliqua: volume x 569 kg.m3 (Ximenes et al. 2008) x 1.58 (Ximenes et al., 2008)
Eucalyptus lucida: volume x 500 kg.m3 (default value) x 1.46 (Snowdon et al., 2000)
Phyllocladus aspleniifolius: volume x 500 kg.m3 (default value) x 1.46 (Snowdon et al., 2000)
Pomaderris apetala: volume x 500 kg.m3 (default value) x 1.46 (Snowdon et al., 2000)
Atherosperma moschatum: volume x 420 kg.m3 (Bootle, 2010) x 1.46 (Snowdon et al., 2000)
Nothofagus cunninghamii: volume x 580 kg.m3 (Bootle, 2010) x 1.46 (Snowdon et al., 2000).
Biomass of dead stems was calculated using a reduction factor of 85% of alive biomass (Bennett et al., 2013) Note: both alive and dead stems are included in the site level calculation of above ground woody biomass.
Tree carbon calculations:
The carbon mass for each stem was calculated using the following formulae:
Carbon in standing biomass (kg) = standing biomass (kg) x carbon concentration (kg)
Carbon concentration for Eucalyptus obliqua is 0.497 (Ximenes et al., 2008). Carbon concentration for all other species is 0.5 (default value).
Carbon mass for Dicksonia antarctica was calculated using the following formulae: Carbon = 2.70E-3 * (DBH2 H)1.19 (Beets et al. 2012).
Notes
CreditWe at TERN acknowledge the Traditional Owners and Custodians throughout Australia, New Zealand and all nations. We honour their profound connections to land, water, biodiversity and culture and pay our respects to their Elders past, present and emerging.
This work was funded by the Terrestrial Ecosystem Research Network (TERN), an Australian Government National Collaborative Research Infrastructure Strategy (NCRIS) project.
This dataset records tree diameter and height data used to calculate above-ground biomass across vegetation types in Australia. This data is important for mapping and monitoring changes in plant growth, carbon storage and terrestrial energy fluxes.
Data Quality Assessment Scope
local :
dataset
Potential diameter and height outliers were assessed by looking at the absolute difference in 1) diameter and 2) height values for each individual stem between two measurement time points. If the diameter or height difference for an individual falls outside the 3rd standard deviation of the mean of that species, then it was flagged as a potential outlier.
Data Quality Assessment Result
local :
Quality Result
All potential outliers were assessed by researchers who collected the data. Any value that was considered to be an outlier was removed from the final dataset.
Created: 2022-01-28
Issued: 2022-04-20
Modified: 2024-09-23
Data time period: 2012-06-01
text: The Warra Tall Eucalypt site is approximately 60 km west south-west of Hobart, Tasmania. It lies partly within the Tasmanian Wilderness World Heritage Area.
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Point-of-truth metadata URL- URI : geonetwork.tern.org.au/geonetwork/srv/eng/catalog.search#/metadata/4f10d9a4-23a3-487e-91e5-ef470da7601e
- global : 4f10d9a4-23a3-487e-91e5-ef470da7601e
