Please Note: Due to the Desert Gala, there will be no Theater Animal Experience Fri 4/25 - Mon 4/28. The Ironwood Restaurant will close at noon on Sun 4/27. The Ironwood Gift Shop, Baldwin Gallery, and the Desert Garden will be closed all day Sun 4/27.

Biological Survey of Ironwood Forest National Monument

Biological Soil Crusts

There is very little exposed soil in this image that spans about 6 inches (15 cm) width. Most of the surface is covered by biological soil crusts. The organisms that form them are nearly invisible except for brief periods when the soil surface is moist. They anchor soil from erosion and some fix atmospheric nitrogen, a limiting nutrient in most desert soils. The upper left quadrant is occupied by a green liverwort. The brown stuff at lower left is probably a lichen. Most of the soil between the pebbles at right is cemented by tiny colonies of cyanobacteria (blue-green algae), algae, mosses, and lichens.

 

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