|
- Trees for a Cold Climate - Geophysical Institute
The hardiest trees rely on physics more than on chemistry to make it through the winter When the seasonal chill begins to reach black or white spruce, for example, the sap leaves their living cells and flows into intercellular spaces There, ice crystals can form without damaging anything vital for the tree's survival
- 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
- Trees as Earthquake Fault Indicators | Geophysical Institute
A swath of dead, tilted and broken trees now makes obvious the trace of the Fairweather fault that broke in July 1958 to devastate Lituya Bay and nearby parts of southeastern Alaska Sagging or tilting of the ground along a fault trace causes trees there to tilt or even fall
- 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
- Bark Beetles in Spruce Trees | Geophysical Institute
Bark beetles attack spruce trees in early summer These brownish black beetles are common throughout Alaska and Yukon Territory where they kill trees by boring through the bark and feeding and breeding in the phloem (inner bark)--the thin layer of soft tissue directly beneath the bark If the beetles girdle the phloem, the tree will die since the phloem is the vital path that transports food
- 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
- Bonsai trees tell of winters long past | Geophysical Institute
The trees have told him that giant weather systems like the Aleutian Low seem to have persisted despite human-caused warming During winters when the Aleutian Low is strong, warmer temperatures and southerly winds create icy, stormy conditions that increase the likelihood of trees being damaged
- The Turkey and the Tambalacoque Tree - Geophysical Institute
The elderly trees still produced seeds, but none of the seeds gerrninated, even when carefully tended under ideal nursery conditions It was tempting to think the old trees were incapable of producing healthy seeds, but Temple didn't accept that reasoning For one thing, the seeds (and their encasing fruit) looked fine
|
|
|