How to Identify Seasons by Growth Rings in a Tree
Have you ever come across a tree stump or cut down an old tree and wondered how many seasons it lived through? Most people know that you can tell how old a tree is by counting its rings, but you can use the rings to tell much more than that. You can tell when the tree was getting a lot of nutrition and when the weather was extremely dry. You'll be able to see when the tree stopped growing for lack of nutrition, and when it grew very quickly. You can also tell from the rings how many springs and autumns the tree endured. Does this Spark an idea?
Instructions
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Look for light-colored tree rings. Rings produced in the spring will be light brown; this is called early or spring wood. The tree grows faster in the spring, so the cells in spring rings aren't packed close together, producing light wood.
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Look for darker colored tree rings. Rings produced late in the summer season, close to fall, will have dark brown edging. This is called summer or late wood. Trees grow more slowly in summer, producing cells that are packed tightly together, producing dark wood.
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Count the rings in pairs, starting in the center. Count one light ring with one dark ring; both rings together mark a year of tree growth. This way, you can approximate the tree's age. There won't be rings marking winter growth, as trees go dormant in the winter and do not grow.
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Look at the spacing between rings. Rings that are far apart indicate a season with optimum rainfall and nutrients in the soil. This means the tree was absorbing nutrients and growing a lot. Closely-spaced rings indicate a poor growing season with little rain. The tree won't grow as much in poor seasons, conserving its energy to stay alive.
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