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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
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
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
The majesty and mystery of Alaska yellow cedar | Geophysical Institute A tree near one of our campsites had a crack at its base through which we could pass the folded saw Yet the tree was still alive, with just one rope of cambium — the outer bark that transports water and nutrients — snaking up the trunk A few of its blue-green feathery leaves flagged from the top of what otherwise looked like a snag
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
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
Formerly Frosty Footing Causes Drunken Forests By the unique pattern of the tree rings, they determined the tree began its fight to right itself after a thermokarst developed 120 years ago The same thing that makes trees tipsy causes problems for those of us who choose to live and work on land underlain by permafrost
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
Orange trees in the Alaska Range | Geophysical Institute It was a tree disease known as spruce needle rust, which infects only the current year’s needles of white, black and Sitka spruce trees The orange powder is composed of millions of tiny spores, which the rust fungus uses to reproduce