Quaking Aspens

Ecology Matters by Duke Vasey

Populus tremuloides is a deciduous tree native to cooler areas of North America referred to as a Quaking Aspen, Trembling Aspen or Quakies. The tree-like plant has tall trunks, up to 25 meters, with smooth pale bark, scarred with black. The glossy green leaves, dull beneath, become golden to yellow, rarely red, in autumn. The species rarely flowers, often propagating through its roots to form large groves.

Each of the approximately 47,000 or so trees in the grove is genetically identical and all the trees share a single root system. While many trees spread through flowering and sexual reproduction, quaking aspens usually reproduce asexually, by sprouting new trees from the expansive lateral root of the parent.

The individual trees aren’t so many individuals, but stems of a massive single clone and this clone is truly massive spanning 107 acres and weighing 6,615 tons. This Quaking Aspen was once thought to be the world’s largest organism (usurped only by thousand-acre fungal mats in Oregon) and is almost certainly the most massive. In terms of other superlatives, the more optimistic estimates of the Trembling Giant’s age have it as over one million years old, which would easily make it the world’s oldest living organism.

Unfortunately, the future of the giant appears grim. According to Paul Rogers, an ecologist at Utah State University in an October 2010 article in the “Deseret News,” the Trembling Giant is in danger. While the mature stems routinely die from the eternal problems of pests and drought, the regenerative roots of the organism that are responsible for the giant’s resilience are under attack as well.

Rogers reported a marked absence of juvenile and young stems to replace the older trunks, blaming overgrazing by deer and elk. Without new growth, to replace the old, the Trembling Giant is vulnerable to a catastrophic, sudden withering and shrinking, i.e., “...the giant is slipping away very quickly.”

The Quaking Aspen is named for its leaves, which stir easily in even a gentle breeze and produce a fluttering sound with only the slightest provocation. The effect, multiplied over the tens of thousands of trees and hundred acres can be unnerving, gives a real sense of life to the ancient, dying, trembling giant.

Duke

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