nitrogen fixation

From Glossary of Meteorology
The incorporation of gaseous molecular nitrogen, N2, into nitrogenous compounds.

Abiotic fixation of N2 occurs via lightning and photochemical conversion in the atmosphere. Biotic fixation of N2 is done by specialized bacteria that construct the hemoglobin-like enzymes necessary to cleave the strong triple bond of molecular nitrogen.

Refers to nonliving basic elements and compounds of the environment.

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