How Do Interactions among Earth's Spheres Vary Regionally?
ES0108  Leaf Area Index
This image shows the Leaf Area Index—the average density of vegetation covering the ground—during the spring of 2000. Dark green pixels indicate areas where more than 80 percent of the land surface is covered by green vegetation; yellow to light green pixels show where leaves cover about 10 to 50 percent of the land surface, and brown pixels show areas of virtually no leaf coverage.

Leaf Area Index, Spring 2000
Leaf coverage images reveal interactions among the biosphere, hydrosphere, and atmosphere. Areas with abundant leaf coverage indicate that the biosphere is actively using the hydrosphere for plant growth. In these areas, transpiration from the leaves is adding water vapor to the atmosphere. In areas with little vegetation, the biosphere is not transferring significant amounts water into the atmosphere.

Look for natural landmarks on the image to help you find the general region in which you live.

9. What is the Leaf Area Index for your own region in the image?

10. Describe interactions among the biosphere, hydrosphere, and atmosphere indicated for your region by this image.

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