http://www.bing.com:80/search?q=Tree+Structure+SystemSearch resultshttp://www.bing.com:80/s/a/rsslogo.gifhttp://www.bing.com:80/search?q=Tree+Structure+SystemCopyright © 2026 Microsoft. All rights reserved. These XML results may not be used, reproduced or transmitted in any manner or for any purpose other than rendering Bing results within an RSS aggregator for your personal, non-commercial use. Any other use of these results requires express written permission from Microsoft Corporation. By accessing this web page or using these results in any manner whatsoever, you agree to be bound by the foregoing restrictions.https://www.gi.alaska.edu/alaska-science-forum/northern-tree-habitats-0Interior 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 ...Wed, 22 Apr 2026 04:25:00 GMThttps://www.gi.alaska.edu/alaska-science-forum/cottonwood-and-balsam-poplarThe 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.Wed, 22 Apr 2026 19:05:00 GMThttps://www.gi.alaska.edu/alaska-science-forum/tree-rings-and-historyA 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 ...Fri, 20 Feb 2026 02:02:00 GMThttps://www.gi.alaska.edu/alaska-science-forum/more-why-tree-trunks-spiralI 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.Mon, 20 Apr 2026 21:16:00 GMThttps://www.gi.alaska.edu/alaska-science-forum/tropical-fossils-alaskaA 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 InteriorSun, 19 Apr 2026 00:32:00 GMThttps://www.gi.alaska.edu/alaska-science-forum/secret-life-red-squirrels-0Stan Boutin has climbed more than 5,000 spruce trees in the last 30 years. He has often returned to the forest floor knowing if a ball of twigs and moss within the tree contained newborn red squirrel pups. Over the years, those squirrels have taught Boutin and his colleagues many things, including an apparent ability to predict the future. Boutin, of the University of Alberta in Edmonton, was ...Wed, 22 Apr 2026 15:09:00 GMThttps://www.gi.alaska.edu/alaska-science-forum/burlsBurls, spherical woody growths on the trunks of spruce, birch and other trees, are commonly found throughout wooded parts of Alaska.Sun, 19 Apr 2026 20:20:00 GMThttps://www.gi.alaska.edu/alaska-science-forum/big-splashes-little-bayThe evidence for this can be found in "trim lines" of old forestation and can be dated by examining the tree rings of the uppermost trees that survived injuries from earlier splashes. These trim lines show that similar, but smaller, waves occurred in Lituya Bay in 1853, 1874, and 1936. It is known that these were not all earthquake generated.Wed, 15 Apr 2026 18:30:00 GMThttps://www.gi.alaska.edu/alaska-science-forum/bark-beetles-take-connecticut-size-bite-out-alaskaKnowing that, forest managers might be able to anticipate an outbreak and plan tree harvests ahead of the beetles or try preventative measures that might work on small outbreaks, such as tree thinning, pruning, setting out hormone traps for beetles, and getting rid of piles of logs that attract beetles.Wed, 15 Apr 2026 11:21:00 GMThttps://www.gi.alaska.edu/alaska-science-forum/pinhole-natures-lensSunlight passing through minor apertures between tree leaves is focused like the rays in a pinhole camera (and, just as with a simple lens, the image is upside-down).Sat, 18 Apr 2026 17:44:00 GMT