Alder root nodules

root nodules

Detailed Description

Root nodules are a symbiotic relationship between a plant and nitrogen-fixing bacteria. A symbiotic relationship is one where both organisms benefit. Nitrogen-fixing bacteria change inorganic nitrogen from the air into ammonia, a form of nitrogen most organisms can use. They also use a process called rock dissolution to release other nutrients, such as calcium and phosphorus, so plants and trees can use them.


Image Dimensions: 4032 x 3024

Date Taken:

Location Taken: OR, US


Steven Perakis, USGS