Eucalyptus regnans

LEucalyptus regnans ( mountain ash in English) is originating in Australia South. It is largest of all the plants with the Séquoia. In 1880, a forester of Victoria in Australia measured one of these Eucalypti with a Théodolite and estimated it at 114 meters (2 meters more than the largest known tree living time, a sequoia). Unfortunately, this tree was cut down and a commemorative plaque always in place recalls that the first Europeans made on the spot decimated the highest specimens by the forestry development with large scales.

Largest alive Eucalyptus regnans , called “Icarus Dream” , was discovered in Tasmanie in January 2005. It measures between 90 and 100 meters in height.

Description

This tree with persistent sheets and is largest of all the Eucalyptus , being able to reach 70 to 90 meters in height. The trunk is right, gray; the bark is smooth except at the base of the trunk, on the 5 to the first 15 meters, where, into growing old, it becomes rough.

The sheets simple, green or greenish grey, sickle-shaped or are lancéolées measuring from 9 to 14 centimetres length for 1,5 to 2,5 broad. The end is acuminate whereas the edges are smooth. The petiole is reddish.

The flowers are in Grappe S from 9 to 15 units; each flower has a diameter of 1 cm diameter and has many white cheesecloth S.

The fruit is a Capsule from 5 to 9 millimetres length on 4 to 7 broad.

Habitat

He lives in the fresh areas, on the deep ground, especially mountainous up to 1.000 m of altitude, with abundant precipitations of more than 1200 millimetres per annum. Its growth is fast, of more than 1 meter per annum and it can reach 65 meters in 50 years. The tree trunks shot down on the ground can continue to shelter a life varied during several hundred years.

Exceptional fact for a eucalyptus, it does not tend to set out again of the foot after a fire and reproduces practically only by seeds. An important forest fire can destroy all the trees, causing a massive germination of the seeds which benefit from the contribution of ashes to develop. One counted up to 2,5 million seeds germinated per hectare after a fire but the competition and the natural selection very quickly bring back the density of adult trees to 30 to 40 individuals to the hectare. If it is thought that it is necessary approximately 20 years so that a seed gives a tree to maturity, it is understood that repeated forest fires can be the cause of a local disappearance of the species.

See too

  • Eucalyptus delegatensis

External bonds

References

  1. '' Tasmanian Giant Trees Advisory Committee '' New Tallest Tree for Tasmania 2005
Eucalyptus regnans measured ace 92 m in 2000 (.pdf file)
  1. Tasmanian Giant Trees Advisory Committee Tasmania' S Ten Tallest Giants 2005
  2. Association off Societies for Growing Australian Seedlings: '' Eucalyptus regnans ''
  3. Victorian Eucalypts: '' Eucalyptus regnans ''
  4. International Society off Arboriculture, Australia Chapter: Australia' S Biggest, Tallest and Oldest Trees-->

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