ABCDEFGHIJKLMNOPQRSTUVWXYZ

Munghorn Gap, NSW

Mt Ainslie, ACT

seedling

Natural populations

Eucalyptus bridgesiana occurs mainly in New South Wales on the northern and Southern Tablelands, extending as far north as the Stanthorpe area in Queensland [1,2]. In Victoria it occurs north and south of the Great Dividing Range and west to the Warby Range. This species grows to about 20 m in height and has distinctive bluish, ovate seedling and juvenile foliage. Its habitat is on tablelands, low hills and often along streams, often on heavy-textured alluvial soils derived from slates and cherts [1].

Flowering and seeds

Eucalyptus bridgesiana flowers mainly during January to March [1,3,4]. Seed capsules persist on trees until at least the following summer. There are about 250 viable seeds per gram; seeds start to germinate in about 7 days if grown at 25°C with no pretreatment required [4].

Cultivation and uses

This species belongs to the group of eucalypts that includes E. nitens, which are renowned for their cold tolerance. Eucalyptus bridgesiana has potential to help remediate gully erosion of clayey soils, particularly where cold air drainage is a problem. It also has potential as a shelterbelt for stock on cold sites. The wood of this species has limited commercial uses as it is soft, brittle and apparently also makes poor firewood [1].

Key descriptors:
Climate parameters
Rainfall distribution pattern: summer, uniform or winter
Frosts (approx. no. per year): up to 20 or greater than 20
Frost intensity: light to moderate (0 to -5°C) or severe or heavy (greater than -5°C)
Mean annual rainfall: 670-900 mm
Mean annual temperature: 9-18 °C
Mean max. temperature of the hottest month: 20-30 °C
Mean min. temperature of the coldest month: -4-4 °C
Altitude: 20-830 metres
Tolerance of extremes in climate
Frost: tolerates frosts in the 0° to -5°C range or tolerates heavy frosts colder than -5°C
Soil factors
Texture: clay loam, heavy clay (greater than 50% clay), light to medium clay (35-50% clay) or loam, sandy loam, sandy clay loam
Soil pH reaction: acidic (less than 6.5) or neutral (6.5-7.5)
Soil depth: skeletal to shallow (less than 30 cm) or  moderate to deep (30-100 cm or greater)
Drainage:  well-drained
Salinity: non-saline
Tolerance of adverse soils
Extremes in pH: acidity
Extremes in texture: clayey
Salinity: nil - sensitive to saline soils
Soil waterlogging tolerance: nil - sensitive to waterlogged soils
Biological traits under cultivation
Habit: evergreen tree to 20 m tall or sometimes taller, usually produces a clear trunk
Longevity: moderate to long lived (>15 years)
Growth rate: moderate
Coppicing ability: vigorous, responds to pruning, pollarding; lignotuberous
Root system: moderate to deep or shallow and spreading
Erosion control potential: excellent for clayey sites
Wood density: mod. to high (greater than 600 kg/cubic metre)
Carbon sequestration potential: moderate
Uses
Potential farm use: excellent windbreak or shelterbelt or shade for stock
Specialty products: flowers produce nectar for honey production or pollen has value for apiculture
Wildlife value: flowers are especially attractive to birds
Wood products: light construction
Potentially undesirable attributes
Growth habit: shallow roots may outcompete adjacent plants

References

[1] Boland DJ, Brooker MIH, Chippendale GM, Hall N, Hyland BPM, Johnson RD, Kleinig DA, McDonald MW, Turner JD (2006) Forest Trees of Australia. CSIRO Publishing, Collingwood.

[2] Slee AV, Connors J, Brooker MIH, Duffy SM, West JG (2006) EUCLID Eucalypts of Australia. Third Edition CD ROM Centre for Plant Biodiversity Research. CSIRO Publishing, Melbourne.

[3] Clemson A (1985) Honey and Pollen Flora. Inkata Press, Melbourne.

[4] Gunn BV (2001) Australian Tree Seed Centre Operations Manual. Internal Publication, CSIRO Australian Tree Seed Centre, ACT. [Online at http://www.ensisjv.com/Portals/0/atsc-opmanualcomplete.pdf  Accessed March 2008]

Internet links

PlantNET National Herbarium of New South Wales: http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl= sp&name=Eucalyptus~bridgesiana  

Top