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How Hardy Trees Survive Winter |
| Section: NATURAL SCIENCE / NATURE WALK |
| Author: Richard W. Tinus |
| Publication: The world & I online |
| Issue Date: 1/1/1988 |
| Size: 756 Words, 4,570 Characters |
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In the Temperate Zones, a tree in summer pulses with life, yet in winter the same tree may have to endure for months in a frozen world.
To survive through a cold winter, the tree's cells must be modified so they are not damaged with the onset of freezing temperatures.
Why would cold weather damage a tree? An important cause of damage is ice formation within the living cells. When water freezes, it increases in volume by about 9 percent. The sudden formation of ice may rupture the cell membranes. Damage can also occur during thawing. Low temperatures ca...
. . .
... are repaired, extensively damaged ones are bypassed, and new growth starts again. How could it be otherwise? Ever since the first plants and trees established themselves on land, long-lived flora have encountered stressful environments. The trees growing today in temperate and boreal climates have inherited many physiological mechanisms for survival during their 400 million years of evolution.
(583 of 4,570 characters)
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