Northern Tree Habitats - Geophysical Institute
网页2024年9月12日 — Northern Tree Habitats. 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 …
Pine grove near Yakutat is farthest north - Geophysical Institute
网页2021年8月12日 — Pine grove near Yakutat is farthest north. YAKUTAT — “There they are,” Ben Gaglioti said, after a short hike off a gravel road leading away from this small fishing town. Gaglioti walked in rubber boots on a green, squishy carpet of muskeg — a wild garden of water-loving plants growing on acidic soil that has for centuries prevented the ...
Visit to an exotic tree plantation in Alaska
网页2021年6月18日 — 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 …
Alaska's Gift--The Pine - Geophysical Institute
网页2024年9月12日 — Alaska's Gift--The Pine. October 05, 1977 / Paula Krebs. Pines no longer grow over most of Alaska, but there is evidence that the area of Alaska and the Bering Sea was the center of development of pines about 260 million years ago. From this point pines spread all over the Northern Hemisphere and even crossed the equator.
Trees for a Cold Climate - Geophysical Institute
网页1993年4月1日 — Winter's extreme cold easily eliminates some tree species hardy elsewhere. Oak, ash, and elm endure occasional severely cold temperatures in the contiguous forty-eight states because they can produce chemicals that serve as natural antifreeze. Thus, the fluids in their cells stay liquid down to forty below, that bitter temperature that is the ...
More on Why Tree Trunks Spiral - Geophysical Institute
网页2024年9月12日 — Prevailing winds, in most of the tree-growing northern hemisphere, are from the west. Combine these factors, and the westerly wind pushing on the thicker south side of the tree, year after year, causes an asymmetrical wind loading which slowly twists the tree around in the observed direction.
New way to spot beetle-killed spruce can help forest, wildfire …
网页2024年6月12日 — News /. New way to spot beetle-killed spruce can help forest, wildfire managers. Dead spruce trees have a teal appearance in image (a), a false-color satellite image used to train the computer algorithm. Image (b) shows the manually delineated dead spruce in preparation for training the algorithm. Image (c) is a false-color image of the …
Mummified forest tells tale of a changing north
网页2011年1月6日 — 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.
The majesty and mystery of Alaska yellow cedar
网页2021年7月23日 — Probably because of chemical compounds within the tree like nootkatin that emit the pleasant odor and tint the wood yellow, Alaska yellow cedar endures like no other tree in the state. In a 1997 paper on the endurance and possible usefulness of dead Alaska yellow-cedar trees, researchers Kent McDonald and Paul Hennon concluded it …
The Smell of Christmas - Geophysical Institute
网页2024年9月5日 — So when you smell your Christmas tree, think of terpenes, hazy summer days, and contented spruce grouse, and remember to keep lighted candles at a safe distance. One of many Christmas pleasures is the aroma of a freshly cut tree. Both spruce and pine have it. So do cranberry fields in the morning, orange peelings, and some paint …
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