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Cottonwood and Balsam Poplar | Geophysical Institute 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
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
Visit to an exotic tree plantation in Alaska | Geophysical Institute These exotic trees — some now 70 feet tall — are a nice legacy for the men who planted shin-high seedlings years before Woodward last visited the plot in 1981 Les Viereck, a renowned ecologist who wrote Alaska Trees and Shrubs, died in 2008
Burls - Geophysical Institute Burls weaken trees but do not kill them The weakening effect, however, makes the trees vulnerable to other diseases which can kill them Relatively little is known about burls, for several reasons: It takes a long time for a burl to grow--nearly as long as the tree on which it is found--so research is stretched out over a long period of time
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
Pollen season arrives, blame the trees | Geophysical Institute The air is rich with pollen because spring is the mating season for trees The first step in a tree's reproductive dance is to release sperm, safely held in the center of a pollen grain Trees release an incredible amount of pollen to improve the odds of finding a female flower
Northern Tree Habitats | Geophysical Institute Why take a chance with exotics, when native trees have proven their ability to survive? Several reasons prompt testing of foreign tree species Human activities often create and maintain new, sometimes artificial habitats that native trees are not adapted to Exotics may have strong wood, large fruits or straight boles that are lacking in the
Mummified forest tells tale of a changing north | Geophysical Institute Pollen samples from lake-bottom muck also show that basswoods, hickories, elms and other trees grew in Alaska and other northern places millions of years ago Those fair-weather trees suggest a very warm period in the far north, while the mummified forest of Ellesmere Island suggests a climate in transition from comfortable to bitter cold
The Kodiak Treeline | Geophysical Institute Spruce trees planted on the islands by the Russians in 1805 are doing just fine and reseeding themselves naturally, although the total tree population hardly amounts to a forest