Abstract
The microbial nitrogen cycle.
Highlights
The papers are ordered by topic beginning with N fixation, the only biological process that can increase the inventory of fixed N, Knapp (2012) reviewed the literature on the sensitivity of N fixation to dissolved inorganic N and found that neither cultured cyanobacteria nor natural assemblages are completely inhibited by the presence of inorganic N substrates
Knapp was cautious about recent reports of N fixation in subeuphotic mesopelagic waters but concluded that N fixation does occur in the presence of fixed N and in geographic ranges not usually associated with cyanobacteria, which may substantially change our understanding of the global marine N budget
Nitrification has been the subject of increasing research interest since the discovery a decade ago that archaea were involved in ammonium oxidation
Summary
Its versatile redox chemistry is the basis of complex biogeochemical transformations that control the inventory of fixed (biologically available) N in local environments, on a global scale and over geological time. The papers are ordered by topic beginning with N fixation, the only biological process that can increase the inventory of fixed N, Knapp (2012) reviewed the literature on the sensitivity of N fixation to dissolved inorganic N and found that neither cultured cyanobacteria nor natural assemblages are completely inhibited by the presence of inorganic N substrates.
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