會走路的樹 這個是 walk tree??
會走路的樹 這個是 walk tree??
下列為 BBC 報導
http://www.bbc.com/travel/story/20151207-ecuadors-mysterious-walking-trees
Like the Ents from JRR Tolkien’s epic Lord of the Rings saga, these trees actually move. But can they walk fast enough to escape the chainsaw and machetes that threaten them?
It takes a whole day to travel from Ecuador’s capital, Quito, to the heart of the Unesco Sumaco Biosphere Reserve, some 100km to the southeast. The journey entails three hours by car to the edge of the forest, and then anywhere from seven to 15 hours by boat, mule and foot, mostly uphill and on a muddy road, to reach the interior. But the effort is worth it, considering you wind up in the middle of a pristine forest that houses a rather unusual find: walking palm trees.
A biodiversity hotspot
Some spots of the Sumaco Biosphere Reserve host nearly 500 species of birds, 51 species of large mammals, 64 species of reptiles, 61 species of amphibians, 6,000 plant species, more than 600 species of butterflies and several very old fern trees, some hundreds of years old.
Like the Ents from JRR Tolkien’s epic Lord of the Rings saga (only a bit slower), these trees actually move across the forest as the growth of new roots gradually relocates them, sometimes two or three centimetres per day.
“As the soil erodes, the tree grows new, long roots that find new and more solid ground, sometimes up to 20m,” said Peter Vrsansky, a palaeobiologist from the Earth Science Institute of the Slovak Academy of Sciences Bratislava. “Then, slowly, as the roots settle in the new soil and the tree bends patiently toward the new roots, the old roots slowly lift into the air. The whole process for the tree to relocate to a new place with better sunlight and more solid ground can take a couple of years.”
Vrsansky, a local guide and conservationist Thierry García have spent the last few months living in the forest while documenting the threats that jeopardize some of its biological wonders.
“During our investigations, we discovered some undocumented 30m waterfalls, two new vertebrate species (a lizard and a frog) and we were attacked by a big herd of really big woolly monkeys,” Vrsansky said. “They were throwing everything at us, including 6m-long dry branches, even their faeces and urine.”
The experience has been daunting as they forage from the forest and survive arduous conditions; Vrsansky recalls losing about 10kg of weight within a week. But despite the hardships, Vrsansky said he was exhilarated when he found, in a single spot, more than 150 cockroach species – more than those currently living in all of Europe. These cockroaches were nothing like the hideous critters lurking around your house; they were all different colours, many either luminescent, shining in the dark, or impossible to discriminate from their backgrounds due to their ability camouflage themselves by mimicking leafs.
http://www.bbc.com/travel/story/20151207-ecuadors-mysterious-walking-trees
Do Walking Palm Trees Really Walk?
A recently published article on BBC’s website mentions a certain palm tree that has allegedly developed a rather unique ability unbecoming of a plant —the ability to walk. The palm in question is Socratea exorrhiza, also nicknamed the “Walking Palm”. The bizarre idea stems from the fact that scientists are unable to explain the tree’s strange stilt-like roots. Found in tropical rainforests of Central and South America, the Socratea exorrhiza develops long and sturdy roots that grow outwards from the base of the tree, several feet off the ground, and take root in the soil around, giving it the appearance of multiple legs. It wasn’t long before people started to believe that these roots actually act like legs enabling the palm tree to literally walk in the forest.
Photo credit: www.palmpedia.net
The amazing story of the walking palm tree has been told by rainforest guides to tourists for years, and appears in many sources both in print and on the web. It is said that the tree “walks” from shade to sunlight by growing roots in the direction it wants to travel, and then allowing the old roots to slowly lift into the air and die. This allows the tree to slowly move towards the side where the new roots are growing. The process is said to take a couple of years, while one palaeobiologist suggesting the tree moves two or three centimeters per day.
It’s such a fascinating story that many tend to believe it, like our palaeobiologist from the Earth Science Institute in Bratislava. Unfortunately, the walking tree is a myth.
The idea of the walking tree was first suggested by John H. Bodley in 1980 who thought that such an ability allows the palm to “walk away” from the point of germination if another tree falls on the seedling and knocks it over. This way, the tree can move away from obstacles that are major hazards for immature palms.
Biologist Gerardo Avalos, director of the Center for Sustainable Development Studies in Atenas, Costa Rica, and —according to LiveScience.com— one of the world's top experts on the Socratea exorrhiza, published a detailed study of the palm and its root in 2005 where he observed that the walking tree can't walk because its roots don't move. A few roots on one side or another may die off, but the trunk itself remains rooted to the spot.
Some people want to see the Socratea exorrhiza walking. Alas, no such time lapse movie exist.
"My paper proves that the belief of the walking palm is just a myth," Avalos told Life's Little Mysteries."Thinking that a palm tree could actually track canopy light changes by moving slowly over the forest floor … is a myth that tourist guides find amusing to tell visitors to the rainforest."
The myth was also debunked in the December 2009 issue of Skeptical Inquirer. “As interesting as it would be to think that when no one is around trees walk the rainforest floor, it is a mere myth,” it read. The article also cited two detailed studies that came to this conclusion.
Researchers are still unsure what role these unique stilt roots play. Some suggest that the multiple roots allow the tree to be more stable in swampy areas, or when there is too much debris in the ground as they can avoid it by moving their roots. It has been suggested that stilt roots allow the palm to grow taller to reach light without having to increase the diameter of the stem, thus investing in less biomass in underground roots than other palms. Of course, none of these theories have ever been confirmed. More importantly, nobody has seen these palm trees walk.
Photo credit: Sandor Weisz/Flickr
Photo credit: Ryan Somma/Flickr
Photo credit: Katja Schulz/Flickr
Photo credit: www.palmpedia.net
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