Wetterzentrale Forum Archiv 2005 1. Quartal
PHAENOLOGIE: Der Sequoia Baum "Washington" liegt im Sterben.
Geschrieben von: General Sherman (Nancy/Lothringen, ca. 250m)
Datum: 12. Februar 2005, 12:19 Uhr
Zwei erschreckende vorher nachher Bilder aus September 2003 respektiv kürzlich im Januar 2005 verdeutlichen die starken Schäden am Sequoia Baum:
Tuesday, February 8, 2005
Before a recent series of unfortunate events, the Washington Tree was one of the largest trees on earth. The giant sequoia -- located in Sequoia National Park -- was more than 254 feet high, with a base circumference exceeding 101 feet.
That put it right behind the Gen. Sherman Tree, which was almost 275 feet high and more than 102 feet in circumference; and the Gen. Grant Tree, which stood more than 268 feet, with a circumference exceeding 107 feet.
But the Washington Tree lost its crown, or top canopy, in a wildfire 16 months ago. Then, heavy storms whittled the tree down further this winter, finally leaving it a sparsely foliaged fang of wood only 115 feet high.
It's still too early to tell whether the most recent damage has sealed the tree's fate, said Alexandra Picavet, a ranger with the park.
"There's still a little foliage on it," she said. "Our scientists can't really make a full evaluation of its condition, because it's about a mile from the nearest road, and there's so much snow on the ground. We'll have a better sense of how it's doing when the snow melts."
The Washington Tree was named after George Washington. It is sometimes confused with two other giant sequoias in the park that share its moniker, the Washington (state) Tree and the Booker T. Washington Tree.
Picavet said the Washington Tree's recent problems were compounded by the fact that it has been hollow for at least 190 years.
"Before active fire suppression (in the 20th century), wildfire cycled through the sequoia groves about every 15 to 50 years," said Picavet. "Sometimes the fires burned into some of the trees, hollowing them out over time. It isn't a terribly common occurrence, but it can't be considered totally unusual."
Due to its hollow interior and sheared-off top, the tree was vulnerable to damage from heavy snowfall, Picavet said.
"Winter is the most dangerous time for the giant sequoias," said Picavet. "These are massive trees, bearing huge loads in both their trunks and limbs. When you add additional tons of snow and ice, the stresses can become too much. "
Giant sequoias are the largest trees on earth, when measured in volume. Coastal redwoods, cousins to the giant sequoia, are taller; and a bald cypress in Mexico is wider than any sequoia. But giant sequoias have the largest mass -- they contain the most wood.
While the Washington Tree's condition can be considered something of a tragedy because it's a living landmark, its decline is by no means unusual. As death comes to all humans, it also comes to all sequoias. It just takes longer.
"It's a completely natural process," Picavet said. "The most common cause of death for giant sequoias is simply falling over."
Kurze Anmerkung dazu: die Sequoias wachsen auf einer Seehöhe von 1700 bis 2300 Meter im Sequoia National Park, Kings Canyon National Park und im Yosemite National Park , dieser schmale Lebensgürtel ist ihr natürlicher Lebensraum. Die Sequoias reagieren sehr empfindlich auf Klimaschwankungen, womit ein weiteres Absterben in ihrem natürlichem Lebensraum zu befürchten ist.
Als Naturfreund trister Gruss... :-(
P.S. Für Baumliebhaber und Naturfreunde unter euch einige weitere Links:
Ueber die Sequoias im Sequoia NP: http://www.sequoia.national-park.com/info.htm#tree
Liste der 30 grössten Sequoia auf der Welt: http://www.nps.gov/seki/bigtrees.htm
Weiter Nachrichtenlinks aus dem Netz: http://news.search.yahoo.com/news/search?p=sequoia+washington+tree&ei=UTF-8&fr=slv1
Beiträge in diesem Thread
Wetterzentrale Forum Archiv 2005 1. Quartal wird administriert von Georg Müller mit WebBBS 5.12.