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 [分享]去年种桉树成果汇报 |
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[分享]去年种桉树成果汇报 -- 爱一点 - (2634 Byte) 2007-10-10 周三, 20:39 (2339 reads) |
AmyAmy
头衔: 海归少校
声望: 讲师
加入时间: 2006/11/21
文章: 591
来自: US
海归分: 19015
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作者：AmyAmy 在 海归商务 发贴, 来自【海归网】 http://www.haiguinet.com
not only make money, but also improve the environment.
Just wondering if these kinds of trees can live in desert? Anyone want to try?
Just searched online, and ZT some as following:
Size and habit
A Eucalyptus may be mature as a low shrub or as a very large tree. There are three main habit and four size categories that species can be divided into.
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Species and hybridism
There are over 700 species of Eucalyptus; refer to the List of Eucalyptus species for a comprehensive list of species. It is believed that all eucalypts are related either closely or remotely. Some have diverged from the mainstream of the genus to the extent that they are quite isolated genetically and are able to be recognised by only a few relatively invariant characteristics. Most, however, may be regarded as belonging to large or small groups of related species, which are often in geographical contact with each other and between which gene exchange still occurs. In these situations many species will appear to grade into one another and intermediate forms are common. In other words, some species are relatively fixed genetically, as expressed in their morphology, while others have not diverged completely from their nearest relatives.
Tolerance
Most eucalypts are not tolerant of frost, or only tolerate light frosts down to -3°C to -5°C; the hardiest, are the so-called Snow Gums such as Eucalyptus pauciflora which is capable of withstanding cold and frost down to about -20°C. Two sub-species, E. pauciflora subsp. niphophila and E. pauciflora subsp. debeuzevillei in particular are even hardier and can tolerate even quite severe winters. Several other species, especially from the high plateau and mountains of central Tasmania such as Eucalyptus coccifera, Eucalyptus subcrenulata, and Eucalyptus gunnii, have produced extreme cold hardy forms and it is seed procured from these genetically hardy strains that are planted for ornament in colder parts of the world.(what's the temporature in Gobi deserts?)
Hazards
Some species of Eucalyptus have a habit of dropping entire branches off as they grow. Eucalyptus forests are littered with dead branches. The Australian Ghost Gum Eucalyptus papuana is also termed the "widow maker," due to the high number of pioneer tree-felling workers who were killed by falling branches. Many people have been killed as they camped underneath the trees. It is thought the trees shed very large branches to conserve water during periods of drought. This may be the real reason behind the drop bear story told to children - the idea is to keep them away from being under dangerous branches.(could this be the reason your trees broken off and live better later on?)
Fire
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.
作者：AmyAmy 在 海归商务 发贴, 来自【海归网】 http://www.haiguinet.com
上一次由AmyAmy于2007-10-11 周四, 10:46修改，总共修改了1次
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 [分享]去年种桉树成果汇报 -- 爱一点 - (2634 Byte) 2007-10-10 周三, 20:39 (2339 reads) - 哈哈 好玩~ -- 信仔 - (11 Byte) 2007-10-11 周四, 21:30 (222 reads)
- 很好！请教几个问题 -- 不拉不拉 - (64 Byte) 2007-10-11 周四, 10:44 (491 reads)
- 桉树现用途大多是造纸 -- 阿米 - (191 Byte) 2007-10-11 周四, 11:01 (741 reads)
- 转帖： -- 愚二 - (409 Byte) 2007-10-11 周四, 11:44 (529 reads)
- 仅供参考 -- mqwerty - (2741 Byte) 2007-10-11 周四, 11:40 (443 reads)
- That would be a great business to try, -- AmyAmy - (3327 Byte) 2007-10-11 周四, 10:40 (266 reads)
- 还有地 -- zhoupihu - (72 Byte) 2007-10-10 周三, 21:42 (619 reads)
- 很感兴趣！ -- 爱一点 - (7 Byte) 2007-10-15 周一, 18:43 (216 reads)
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