The Biosphere 2 project was created as a research tool for scientists to study Earth’s living systems, and it allowed scientists to play with farming and innovation in a way that didn’t harm the planet. One of the most profound discoveries made by the scientists had nothing to do with a cure for some new disease or a new way of farming land. Rather, the discovery had to do with the wind’s role in a tree’s life. The trees inside Biosphere 2 grew rapidly, more rapidly than they did outside of the dome, but they also fell over before reaching maturation.
After looking at the root systems and outer layers of bark, the scientists came to realize that a lack of wind in Biosphere 2 caused a deficiency of stress wood. Stress wood helps a tree position itself for optimal sun absorption and it also helps trees grow more solidly. Without stress wood, a tree can grow quickly, but it cannot support itself fully. It cannot withstand normal wear and tear, and survive. In other words, the trees needed some stress in order to thrive in the long run.
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Source: Ultra Facts