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Fire scars are thought to be the main cause of dead tops. Although lightning strikes rarely kill mature trees, lightning sometimes knocks out large portions of crowns or ignites dead tops. The most common cause of death in mature giant sequoias is toppling, due to weakening of the roots and lower trunk by fire and decay.
Each of the trees in this stand is a genetically identical male that has reproduced vegetatively. Although no single tree in this stand is of that age, the stand itself as a single organism has existed that long. [120] Individual trees in the clonal patch have been listed as having ages of 2000 [121] [122] or even to 3000 years old. [123] [124]
On the one hand, the researchers found, trees in forests "desire" to grow as tall as possible to overtake neighboring trees and reach stronger sunlight. On the other hand, gravity makes it more and more difficult to haul water upwards from the roots to the canopy as the tree grows, and leaves thus become smaller near the top. They discovered ...
The trees do not begin to bear cones until they are 12 years old. Trees may produce sprouts from their stumps subsequent to injury, until about 20 years old; however, shoots do not form on the stumps of more mature trees as they do on coast redwoods. Giant sequoias of all ages may sprout from their boles when branches are lost to fire or breakage.
The northernmost grove, with only six trees, the largest being 3.66 m (12.0 ft) in diameter. The grove is also the furthest removed from all other giant sequoia groves. Part of the American River watershed. North Calaveras Grove: Calaveras Big Trees State Park Calaveras County
Pinus ponderosa in Idaho. Pinus ponderosa is a large coniferous pine tree.The bark helps distinguish it from other species. Mature to overmature individuals have yellow to orange-red bark in broad to very broad plates with black crevices. [14]