Ruqayyah Snyder
Eucalyptus trees, commonly known as gum trees, are iconic in Australia. They are native to Australia, Papua New Guinea, parts of Indonesia, and a handful of species that only live in South-East Asia. Eucalypts were introduced from Australia to the rest of the world following the Cook expedition in 1770 and have since been grown in plantations in many other countries. They are fast-growing and have valuable timber, making them desirable for forestry. Eucalypts are a diverse group of trees and shrubs, with about 900 species, and they dominate the Australian landscape, covering 101 million hectares, or 77% of Australia's total native forest area.
| Characteristics | Values |
|---|---|
| Number of Eucalyptus species | 826 known species |
| Number of Eucalyptus species growing only in Australia | 812 |
| Percentage of Eucalyptus species native to Australia | 98% |
| Number of Eucalyptus varieties | 900 |
| Number of Eucalyptus varieties native to Australia | 894 |
| Number of Eucalyptus species under cultivation in California | 250 |
| Number of forest subtypes based on the form of individual trees, crown cover and tree height | 11 |
| Height of mature mountain ash (E. regnans) trees | 55-75 meters |
| Height of the tallest mountain ash tree | 99 meters |
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What You'll Learn
- Eucalypts are native to Australia, Papua New Guinea, parts of Indonesia, and a few species in South-East Asia
- They are the tallest flowering plants on Earth
- Eucalypts draw up gold from the ground through their root system
- They are fast-growing and have valuable timber
- Eucalypts are under threat from human use of land, especially agriculture and urbanisation
Eucalypts are native to Australia, Papua New Guinea, parts of Indonesia, and a few species in South-East Asia
Eucalypts are a diverse group of trees and shrubs native to Australia, Papua New Guinea, parts of Indonesia, and a few species in South-East Asia. They are iconic to the Australian landscape, with their unique features, including aromatic leaves and textured bark, making them both recognisable and enigmatic.
There are approximately 900 species of eucalypts, which include the genera Eucalyptus, Corymbia, and Angophora. Of these, 894 are native to Australia, with a few species native to islands north of Australia and a smaller number found outside the continent. Eucalypts dominate Australia's landscapes, from arid deserts to lush rainforests, and are present in all states and territories. They have also been introduced to many other parts of the world, including California, southern Europe, Africa, the Middle East, South Asia, and South America.
Eucalypts play a crucial role in Australia's ecosystem, providing habitat, food, and ecological services to a wide range of species. They are the tallest flowering plants on Earth, with the tallest individual eucalypt, the Eucalyptus regnans in Tasmania, measuring nearly 100 metres in height. Eucalypts are well-adapted to their environment, with many species able to survive and recover from wildfires, and they are also the greatest recyclers of CO₂, playing a key role in mitigating climate change.
Eucalypts offer flowers, sap, and bark that provide food, shelter, and nesting sites for a diverse range of animals, including koalas, gliders, possums, and native birds. They are culturally significant to Australia's First Nations People and are celebrated each year on National Eucalypt Day on March 23.
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They are the tallest flowering plants on Earth
Eucalyptus trees, commonly known as eucalypts or "gum trees", are iconic in Australia. They are native to Australia, Papua New Guinea, and parts of Indonesia. About three-quarters of Australian forests are eucalypt forests, and almost all eucalypt species are native to Australia. Eucalypts were introduced to the rest of the world from Australia following the Cook expedition in 1770. Botanist Sir Joseph Banks collected them, and they were later introduced to many parts of the world, including California, southern Europe, Africa, the Middle East, South Asia, and South America.
Eucalypts vary in size and habit, from shrubs to tall trees. The tallest flowering plant in the world is the Eucalyptus regnans, found in Tasmania, which can grow to nearly 100 meters tall. The tallest individual, known as 'Centurion', stands at over 99 meters tall. Historical records indicate that the tallest tree, reaching 114 meters, was cut down in Victoria in 1880. Some mountain ash trees can grow to more than 90 meters, making them the tallest plant species in Australia and one of the world's tallest hardwoods.
The ability of eucalypts to reach such heights is due in part to their adaptation to low rainfall and their survival strategy in response to bushfires. In regions with low rainfall, eucalypts can grow up to 20 meters tall. They have also evolved to survive bushfires by forming a large lignotuber, or "mallee root," just below the ground. When a fire burns the top of the tree, new stems sprout from the protected root, and a new tree emerges within a few months. This adaptation has allowed eucalypts to colonize and stabilize the ancient sand dunes in the Murray Mallee region, which borders South Australia, Victoria, and New South Wales.
The height and presence of eucalypts in Australia's landscape is significant. They play a crucial role in the country's ecosystem, providing habitat, food, and ecological services to a diverse range of species. They are also culturally significant to Australia's First Nations People. The sheer size and prevalence of eucalypts in Australia's forests contribute to their iconic status and make them a defining feature of the Australian continent.
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Eucalypts draw up gold from the ground through their root system
Eucalyptus trees, also known as gum trees, are iconic Australian forest trees. They are native to Australia, with almost all eucalypt species being native to the country. They were introduced to the rest of the world following the Cook expedition in 1770. Eucalypts are commonly found in all states and territories of Australia, except for its driest regions. They are absent from the tropical and subtropical rainforests in eastern Australia, as well as the warm and cool temperate rainforests of Victoria and Tasmania.
The Eucalyptus tree acts as a hydraulic pump, using its roots to draw up water from the ground, a crucial function in arid environments. This process also results in the absorption and transportation of gold particles from the surrounding soil and bedrock up to the leaves. The roots of Eucalyptus trees can extend tens of meters into the ground, reaching depths that are inaccessible by traditional mining methods.
By studying the leaves of Eucalyptus trees, scientists can gain insights into the presence of underground gold deposits. This natural process, known as biogeochemical sampling, has been proposed as a mineral exploration method. It offers a way to discover new gold deposits, which have declined by 45% in the past decade. The application of this technique is particularly relevant in the current age, where most of the readily accessible gold near the planet's surface has already been mined.
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They are fast-growing and have valuable timber
Eucalyptus trees are fast-growing and are cultivated for their valuable timber. They have been grown in plantations in many countries outside of Australia, such as in California, southern Europe, Africa, the Middle East, South Asia, and South America. In Portugal and Spain, for instance, eucalypts have been cultivated for the production of pulpwood.
The fast-growing nature of eucalyptus trees makes them economically important trees, and they have become a cash crop in poor areas such as Timbuktu, Mali, and the Peruvian Andes. Eucalyptus trees can be grown from stratified seeds or branch cuttings. Seeds sprout in 4-6 weeks under proper conditions, while cuttings treated with rooting compound are ready to transplant in 10 weeks.
The high growth rates and adaptability of eucalyptus plantations contribute to revenues reaching $5,000-$10,000 per acre, depending on the market and quality. The cost of establishing eucalyptus plantations ranges from $1,000 to $3,000 per acre, depending on factors such as location, irrigation, and labor.
Eucalyptus trees are grown for durable hardwood, biomass, and eucalyptus oil, which is valued for its medicinal and industrial uses. The high resin content of eucalyptus wood results in a high-density wood that is valuable for timber. The two valuable timber trees, alpine ash (E. delegatensis) and Australian mountain ash (E. regnans), are killed by fire and can only regenerate from seeds.
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Eucalypts are under threat from human use of land, especially agriculture and urbanisation
Eucalyptus trees, commonly known as "gum trees", are iconic in Australia. About three-quarters of Australian forests are eucalypt forests, and almost all eucalypt species are native to the country. However, eucalypts are not exclusive to Australia and can be found in many other parts of the world, including California, southern Europe, Africa, the Middle East, South Asia, and South America.
Eucalyptus trees also pose a threat to agricultural crops. In Kenya, for example, farmers perceive Eucalyptus tereticornis and Eucalyptus camaldulensis as a threat to their crops, despite the potential benefits of these species in areas with poor soils and a need for fast-growing fuelwood stocks. Eucalyptus plantations can also degrade soil quality due to the accumulation of leaves and the presence of anthropogenic garbage. The expansion of these plantations can threaten native biodiversity and disrupt natural ecosystems.
In addition to environmental concerns, the large-scale cultivation of eucalyptus trees has had social and economic impacts. In some cases, the reduced labour needs of tree farming on land previously used for agriculture have resulted in widespread unemployment, primarily affecting the poor. The income generated from eucalypt tree crops can also be unevenly distributed, benefiting wealthy farmers while negatively affecting food production and prices for the general population.
Efforts to remove eucalyptus trees, particularly in California, have been met with mixed reactions. While some support the removal and restoration of native ecosystems, others value the presence of these trees for their ornamental and functional purposes. The process of removing eucalyptus trees can also be challenging and expensive, requiring machinery or the use of herbicides.
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Frequently asked questions
No, while most species of eucalyptus are native to Australia, they have been introduced to other parts of the world, including California, southern Europe, Africa, the Middle East, South Asia, and South America.
Eucalyptus trees are well-adapted to the Australian environment, including drought, nutrient-poor soils, and fires. They have oil-rich foliage that burns readily, and they are able to resprout after a fire or have seeds that survive.
Yes, there are about 900 species of eucalyptus trees, including tall trees and shrubs. Some common types include the river red gum, mountain ash, and Darwin woollybutt.
