If one of those elements is contaminated, entire groves of trees can die. Trees need air, water, and soil to survive. This means trees stop growing a lot sooner than they would have otherwise, lowering the timberline. Even hiking, over a long period of time, can trample saplings or prevent new ones from taking root. ![]() Development can lower the timberline when land is used for commercial activity, agriculture, or housing. Other times, the timberline can be lowered by human activity. Sometimes, the timberline can be lowered by natural causes such as fire. The trees will get shorter and shorter until the weather is too harsh for any trees, large or small, to grow. Small trees need less moisture and less oxygen. For example, trees at the timberline start to look more like low bushes than trees. The timberline is usually a point where there isnt enough air, heat, or water to keep trees alive.Īlthough the timberline often seems abrupt from a distance, on the ground you can observe a gradual change from big, tall trees to stumpy ones. ![]() This imaginary line on the Earth is called the timberline, or the tree line. Think of it like this: someone draws a horizontal line on a mountainside above that line, there are no trees. But above certain elevations, trees just cant grow. Trees grow all over the world, in many different types of weather.
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