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alaska.edu

https://www.gi.alaska.edu/alaska-science-forum/cot…

Cottonwood and Balsam Poplar | Geophysical Institute

The Klukwan giant holds the national record for black cottonwood diameter. Its nearest rival, a tree near Salem, Oregon, does hold the national height record. The Klukwan giant belies the belief that trees tend to get smaller the farther north one goes. Both balsam poplar and cottonwood have value for fuel wood, pulp and lumber.

alaska.edu

https://www.gi.alaska.edu/alaska-science-forum/nor…

Northern Tree Habitats - Geophysical Institute

Interior Alaskan forests have only six native tree species: white spruce, black spruce, quaking aspen, balsam poplar, larch (tamarack) and paper birch. Northern Canadian forests have all of those, plus jack pine, balsam fir and lodgepole pine. Since northern Canada and interior Alaska share the same grueling climate and extremes of daylength, why are the Canadian tree species absent from ...

alaska.edu

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Visit to an exotic tree plantation in Alaska | Geophysical Institute

The two-acre exotic tree plantation is part of a much-larger “boreal arboretum” on the UAF campus, which mostly consists of native spruce, birch, aspen, poplar and willow trees. Having borrowed the key from a researcher with UAF’s Agricultural and Forestry Experiment Station, Woodward has invited me to join him inside the chain-link fence.

alaska.edu

https://www.gi.alaska.edu/alaska-science-forum/tur…

The Turkey and the Tambalacoque Tree - Geophysical Institute

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.

alaska.edu

https://www.gi.alaska.edu/alaska-science-forum/mor…

More on Why Tree Trunks Spiral | Geophysical Institute

I eventually found a tree with a spiral lightning mark and it followed the spiral grain exactly. One tree, of course, proves nothing. "But why should the tree spiral? More speculation here: Foliage tends to be thicker on the south side of the tree because of better sunlight.

alaska.edu

https://www.gi.alaska.edu/alaska-science-forum/tro…

Tropical Fossils in Alaska | Geophysical Institute

A 20-inch fossil palm leaf that once waved over a tropical forest in Alaska 45-60 million years ago. The fossil was found in rocks near the Malaspina Glacier. Photo from the U.S. Geological Survey, Dept. of the Interior

alaska.edu

https://www.gi.alaska.edu/alaska-science-forum/wit…

Witches' Broom | Geophysical Institute

Witches' broom on spruce trees is caused by a rust disease (a kind of fungus disease). The rust lives on the spruce tree throughout the year. Each spring, small yellow pustules appear on the new needles of the broom. A strong sweet odor, which is easily recognizable, usually accompanies the maturation of these pustules.

alaska.edu

https://www.gi.alaska.edu/alaska-science-forum/tre…

Trees as Earthquake Fault Indicators | Geophysical Institute

Then using tree ring dating methods, it may be possible to date earthquakes occurring before historical records were kept. The ability to identify and date very large earthquakes occurring within the past thousand years is important in establishing earthquake risk and for predicting future earthquakes.

alaska.edu

https://www.gi.alaska.edu/alaska-science-forum/tre…

Tree Rings and History | Geophysical Institute

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-sections of the tree's trunk. In good growing years, when sunlight and rainfall are plentiful, the growth rings ...

alaska.edu

https://www.gi.alaska.edu/alaska-science-forum/bla…

Black Spruce | Geophysical Institute

Black spruce, unlike some other trees, tend to produce seed annually or nearly annually. They start bearing cones at about age 15. Once black spruce seed cones mature, they may remain on the tree for several years. So regardless of when a fire strikes, mature seeds are available, and many are tough enough to survive the fire.