Dinitrogen fixation by plants (in symbiosis with root bacteria) is a major source of new nitrogen for land ecosystems 1.A long-standing puzzle 2 is that trees capable of nitrogen fixation are ...

Vitousek, P. M. et al. Human alteration of the global nitrogen cycle: sources and consequences. Ecological Applications 7, 737–750 (1997).

A schmetic diagram of the nitrogen cycle (Reprinted from Current Tides, Volume 3.) A weekly time series to study the nitrogen cycle in the dark bottom water of the Bedford Basin. A project led by CERC ...

But certain aspects of the nitrogen cycle in forests have puzzled scientists, defying, in a sense, the laws of supply and demand. ... One part of the solution to the puzzle, ...

Understanding the pre-oxygen nitrogen cycle provides a crucial piece of the puzzle in reconstructing the early Earth’s environment and the conditions that led to the evolution of complex life.

The Thaumarchaeota play a key role in the marine nitrogen cycle. They gain energy for growth by converting ammonia, which is the most reduced form of inorganic nitrogen, to a more oxidized form: ...

This additional part of the nitrogen cycle is called denitrification. Nitrogen fixation, ammonification, nitrification and denitrification, are all parts of the nitrogen cycle that depend on bacteria.