How+ecosystems+change--land

Changes happen everywhere on Earth. Ecosystems go through both slow and sudden changes. It means how the world changes. An example is after a volcano erupts, it makes land when the lava cools down. But how does nature change an abandoned field into a forest?

__From Farmland to Forest__

In the first year, crabgrass, insects,and mice invade the field where crops grew. Tall weeds and tall grasses grow with the crabgrass. crabgrass can't survive easily in the shade of the weeds.

In the second and third years, the crabgrass starts to die out. Rabbits and birds move in. Many kinds of flowers grow. The hot, dry field of tall weeds provide a great environment for pine trees to sprout.

In the fourth year, pine trees grow and begin to shade out the weeds, which begin to wither. More birds come, and so do opossums and skunks.

Twenty-five years later, a pine forest has replaced the old field. The number of pine seedlings drop, since they can't grow in the shade. Seeds of deciduous trees sprout and take root. Foxes and raccoons begin to visit.

The forest is now mostly deciduous trees one hundred years later. Small animals and birds also move in.

We got this from our science book.

By Quinci and Mikayla.

1`http://www.flickr.com/photos/elwardphotography/3303661467/


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For example when they get in fights.
 * 1) 2. A definition for ecosystem is all the living and nonliving things in an environment, including their interactions with each other.
 * 1) 3. A example for when ecosystems change is when crops die and then next season they have to be replanted.


 * 1) 4. We found this information in our fifth grade Science book, Prairies and grasslands, Prairies, and the computer.

By Chandler and Krista