How does calculate age of tree by using annual ring?
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1. Examine the rings of an exposed stump. The number of rings on a stump indicates the number of years the tree lived. You’ll see rings of darker and lighter bands; 1 year of growth is composed of both a dark and light band. Since they’re easier to distinguish, count the dark bands to estimate the age.The rings can also tell you about the environmental conditions for a particular year. Thinner rings represent colder or dryer years, and thicker rings represent better growing conditions.
2. Sand the stump to see the rings more clearly.If the rings are hard to make out, start by sanding them with coarse, 60-grit sandpaper. Finish with a very fine sandpaper, such as 400-grit. Spraying the surface lightly with water can also make the rings easier to see.You might find that some rings are too close together to see clearly. If necessary, use a magnifying glass to get a better view.
3. Count the rings from the pith to the bark. Find the pith, or the small circle at the center of the concentric rings. Start counting from the first dark band around the pith. Continue counting until you’ve reached the bark. The last ring is pressed up against the bark and hard to see, so make sure to include it in your count.If you have trouble keeping track, try writing a number or making a mark every 10 rings with a pencil.
2. Sand the stump to see the rings more clearly.If the rings are hard to make out, start by sanding them with coarse, 60-grit sandpaper. Finish with a very fine sandpaper, such as 400-grit. Spraying the surface lightly with water can also make the rings easier to see.You might find that some rings are too close together to see clearly. If necessary, use a magnifying glass to get a better view.
3. Count the rings from the pith to the bark. Find the pith, or the small circle at the center of the concentric rings. Start counting from the first dark band around the pith. Continue counting until you’ve reached the bark. The last ring is pressed up against the bark and hard to see, so make sure to include it in your count.If you have trouble keeping track, try writing a number or making a mark every 10 rings with a pencil.
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