Tree Cookies! They're round. They're full of fiber. But unless you're a termite, you can't eat tree cookies! Based on: http://www.idahoforests.org/cookie1.htm.

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Presentation transcript:

Tree Cookies! They're round. They're full of fiber. But unless you're a termite, you can't eat tree cookies! Based on: http://www.idahoforests.org/cookie1.htm

Tree cookies are cross sections of tree trunks that foresters and teachers use to illustrate how trees grow. Tree cookies reveal the many different layers that make up a tree. Each layer can tell us something about the tree's life and the climate in which it grew.

The Growth Ring Item 4 is a growth ring. The lighter portion is called the "early wood" (because it grows in the spring), and the darker portion the "late wood" (which grows in the summer). Together, they represent one year of growth.

The Outer Bark Item 6 is the outer bark. This layer protects a tree from insects and disease, excessive heat and cold, and other injuries.

Count the Tree Rings. Just for fun, predict the number of rings on each of the tree cookies. They are about the same size, but are they of the same age? Count the rings and find out.

Tree Cookie #1 How old is this tree?

Tree Cookie #2 How old is this tree?

Explain the differences. How might you account for the differences? (HINT: Think about all the things a tree needs in order to grow.)

The Explanation for Tree Cookie #1: The first tree cookie has a small number of wide rings, indicating that it came from a young tree that grew in an area where it had little competition for the things a tree needs to grow -- such as sunlight, water, and nutrients.

The Explanation for Tree Cookie #2: The second cookie has many tight rings. It is from an older tree that grew with more competition. The fact that the center rings are offset (not in the middle) indicates that the tree either grew on a slope or had to grow around some sort of obstruction. Q. Does this tree have heartwood?

Dendrochronology = The dating and study of annual tree rings.

Tree Cookie Lab

Before starting the lab – Read the information given. We will assume that the tree of your tree cookie was cut down this year (2015). Important when you have to indicate some dates on your tree cookie diagram.