Cottonwood and Balsam Poplar - Geophysical Institute
2024年11月15日 · Aspen leaves are nearly round, one to two inches across, shiny green above and pale beneath. Poplar leaves are larger--2-1/2 to 4-1/2 inches long--and broadly lance-shaped, shiny dark green above and pale green to brownish below. The cottonwood leaf is very similar to the poplar. If you see a cottonwood tree in interior Alaska, you can be sure ...
Tree line changes on the Kenai Peninsula | Geophysical Institute
2008年2月6日 · The gradual change in tree line is one of many that people have noticed on the Kenai Peninsula in recent years. The most obvious is the 1980s-to-1990s Spruce bark beetle invasion, during which the insects killed 30 million mature spruce trees on the Kenai and a wide swath of southern Alaska. Harding Icefield, coating the high country of the ...
The majesty and mystery of Alaska yellow cedar
2021年7月23日 · Probably because of chemical compounds within the tree like nootkatin that emit the pleasant odor and tint the wood yellow, Alaska yellow cedar endures like no other tree in the state. In a 1997 paper on the endurance and possible usefulness of dead Alaska yellow-cedar trees, researchers Kent McDonald and Paul Hennon concluded it was good stuff:
The largest black spruce in Alaska | Geophysical Institute
2024年11月7日 · The black spruce on the UAF campus is taller than the state record western paper birch, a 67-footer near Haines, and Alaska’s tallest balsam poplar, a 60-foot tree on the Kuskokwim River. Alaska’s current champion white spruce will soon give up its title, Malone said. The 112-foot tree in the floodplain of the Tok River is dying from an ...
Feltleaf willows: Alaska’s most abundant tree
2023年5月25日 · The most plentiful moose food in the state — and probably Alaska’s most numerous tree — is the feltleaf willow, which was once called the Alaska willow. As its name implies, the feltleaf sprouts canoe-shaped green leaves that feel fuzzy on the underside. Most of the feltleaf willows in Alaska are in areas disturbed by moving rivers ...
Trees for a Cold Climate - Geophysical Institute
1993年4月1日 · Winter's extreme cold easily eliminates some tree species hardy elsewhere. Oak, ash, and elm endure occasional severely cold temperatures in the contiguous forty-eight states because they can produce chemicals that serve as natural antifreeze. Thus, the fluids in their cells stay liquid down to forty below, that bitter temperature that is the ...
The Turkey and the Tambalacoque Tree - Geophysical Institute
1990年11月14日 · The problem was the decline of the tambalacoque tree, a once common and useful source of timber for the island residents. Only thirteen of the trees remained, and they were sickly specimens. Stanley Temple, a scientist in the department of wildlife ecology at the University of Wisconsin, Madison, found himself discussing the problem with ...
Tree Rings and History - Geophysical Institute
2024年10月3日 · Tree Rings and History. April 08, 1983 / Larry Gedney. A tree's age can be easily determined by counting its growth rings, as any Boy or Girl Scout knows. Annually, the tree adds new layers of wood which thicken during the growing season and thin during the winter. These annual growth rings are easily discernible (and countable) in cross ...
Burls and Human Cancer - Geophysical Institute
2024年11月7日 · Burls and Human Cancer. July 25, 1979 / T. Neil Davis. There is enough similarity between the growth of burls on Alaskan spruce trees and the occurrence of some cancer in humans that the two could be different manifestations of the same phenomenon. Every spruce burl that I have seen cut into shows highly ordered structure in the region of ...
The Life of A White Spruce In The Subarctic - Geophysical Institute
2024年10月17日 · This majestic tree is one of the most commercially important species in the Interior, it is valued for the houselogs, firewood, and other products that are derived from it. In fact, it has been and still is the most important tree in the subsistence life of the Alaska Athabascans, who use all parts of the tree including the roots and resin.