It may relate to anthropogenic alternations to the regional nitrogen cycle, but researchers are still unsure of the causes of this change to the lake's ecology.
42.
Scientists estimate that before humans began altering the nitrogen cycle, these natural processes fixed from 90 million to 150 million metric tons of nitrogen a year.
43.
Now, however, scientists at the University of Wales Swansea have found a plant that makes nitrates and nitrites on its own as part of the nitrogen cycle.
44.
Anyway, I just cleaned up the SVG original, uploaded it to Commons as : Image : Aquarium Nitrogen Cycle . svg and marked the PNG as superseded.
45.
Appropriate handling of the nitrogen cycle, along with a balanced food supply and consideration of biological loading, is usually enough to keep these nutrient cycles in adequate equilibrium.
46.
Chisholm's work showed that an even larger amount of carbon was cycled through these small algae, which may also play an important role in the global nitrogen cycle.
47.
Nitrogen occurs in all living organisms, and the nitrogen cycle describes movement of the element from air into the biosphere and organic compounds, then back into the atmosphere.
48.
The Ecological Society of American paper, " Human Alteration of the Global Nitrogen Cycle-Causes and Consequences " : www . esa . org / sbi / issues . htm
49.
Appropriate handling of the nitrogen cycle, along with supplying an adequately balanced food supply and considered biological loading, is enough to keep these other nutrient cycles in approximate equilibrium.
50.
With their symbiotic bacteria that " fix " atmospheric nitrogen into a form that plants can use, peas and other legumes play an important role in the nitrogen cycle.
