Add a leaf to help plant trees with words of environmental wisdom!
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Ross
- 6 minutes ago - it-eco.net 
Leaf #346 today!
Had a nice picture of autumn trees, but my computer didn't want to download it. Bright Blessings, Christine
On warm days vapourised eucalyptus oil rises above the bush to create the characteristic distant blue haze of the Australian landscape. Eucalyptus oil is highly flammable (trees have been known to explode[3][4]) and bush fires can travel easily through the oil-rich air of the tree crowns. The dead bark and fallen branches are also flammable. Eucalypts are well adapted for periodic fires, in fact most species are dependent on them for spread and regeneration.[citation needed] They do this via lignotubers, epicormic buds under the bark and from fire-germinated seeds sprouting in the ashes.[citation needed]
Eucalypts originated between 35 and 50 million years ago, not long after Australia-New Guinea separated from Gondwana, their rise coinciding with an increase in fossil charcoal deposits (suggesting that fire was a factor even then), but they remained a minor component of the Tertiary rainforest until about 20 million years ago when the gradual drying of the continent and depletion of soil nutrients led to the development of a more open forest type, predominantly Casuarina and Acacia species. With the arrival of the first humans about 50 thousand years ago fires became much more frequent and the fire-loving eucalypts soon came to account for roughly 70% of Australian forest.
Eucalypts regenerate quickly after fire. After the Canberra bushfires of 2003, hectares of imported species were killed, but in a matter of weeks the gum trees were putting out suckers and looking generally healthy.
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