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Tropical Fossils in Alaska - Geophysical Institute
Paleobotanist Jack A. Wolfe of the United States Geological Survey at Menlo Park, California, has found a number of tropical rain forest fossils along the eastern Gulf of Alaska. These include several kinds of palms, Burmese lacquer trees, mangroves and trees of the type that now produce nutmeg and Macassar oil.

Pollen season arrives, blame the trees - Geophysical Institute
Anderson found that birch trees begin releasing pollen about two days before leaves emerge from buds, and the concentration of birch pollen is greatest about three days after the leaves come out. He measured more than 4,500 grains of birch pollen per cubic meter on the highest pollen days.

Fast-Growing Trees - Geophysical Institute
Gregory and Wilson found that trees in both areas formed the same number of tracheids but that the white spruce in Alaska produced most of these cells in about one-half as much time as it took the trees in Massachusetts. In other words, the cambium in Alaskan trees was producing tracheids at a rate twice that of the Massachusetts trees.

More on Why Tree Trunks Spiral - Geophysical Institute
Granted, not all trees exhibit the same twist, but the majority of them do. The phenomenon can be likened to the claim that water will always spiral out of a drain in a counter-clockwise direction in the northern hemisphere. It is well known that you can make it spiral out in either direction, if you give it a little shove first.

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.

Mummified forest tells tale of a changing north
The mummy trees of northern Ellesmere Island include a trunk of a pine tree four feet long and six inches in diameter. Each of the trees was at least 75 years old when it died. The ancient forest holds samples of the last real trees in the area before it became too cold and dry to support large plants, Barker said.

Trees as Earthquake Fault Indicators - Geophysical Institute
Trees along faults often are killed by drowning because the faults tend to collect normal drainage water. In some instances, there are widespread tree kills caused by general subsidence. Killed by sinking caused in the great 1964 Alaskan earthquake, firmly stark forests of dead trees stand guard around the shore of upper Turnagain Arm, near ...

Tamarack -- Not A Dead Spruce - Geophysical Institute
Tamarack commonly grows on cold, wet sites and its growth rate and appearance do little to stimulate interest. When one of these trees finds itself on a better site, however, it shows a remarkable change of pace. Individual tamarack growing in white spruce stands may achieve a size comparable to white spruce 100 to 150 years old.

Alaska tamaracks still hanging on after attack
The tamarack is one of Alaska’s prettiest and most endangered trees. An insect outbreak in the past decade killed up to 80 percent of the adult trees in the state and scientists are keeping an eye on tamaracks to see if they’ll need to resort to “genetic conservation,” removing small trees from the forest so some will exist in the future.

Tree line changes on the Kenai Peninsula | Geophysical Institute
The changes in Kenai Peninsula trees might be due to the milder weather the peninsula, along with most of Alaska, has experienced since about 1977, when ocean-surface temperatures in the North Pacific warmed. Climatologists with the Alaska Climate Research Center report that the Homer area warmed 4.2 degrees Fahrenheit on average from 1949 to 2007.

 

 

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