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All living organisms require nitrogen, and a single process biological nitrogen fixation accounts for more than 97% of natural nitrogen inputs into Earth s ecosystems. To date, most nitrogen fixation research has focused on the symbiotic nitrogen fixation occurring via the structured relationship of particular bacteria and plant roots. Yet free-living nitrogen fixation, the nitrogen fixation occurring outside of this symbiosis, may represent the dominant source of biologically-available nitrogen to a variety of ecosystems. Here we explored free-living nitrogen fixation controls, ranging from…mehr

Produktbeschreibung
All living organisms require nitrogen, and a single
process biological nitrogen fixation accounts for
more than 97% of natural nitrogen inputs into Earth s
ecosystems. To date, most nitrogen fixation research
has focused on the symbiotic nitrogen fixation
occurring via the structured relationship of
particular bacteria and plant roots. Yet free-living
nitrogen fixation, the nitrogen fixation occurring
outside of this symbiosis, may represent the dominant
source of biologically-available nitrogen to a
variety of ecosystems. Here we explored free-living
nitrogen fixation controls, ranging from the effect
of fertilization on nitrogen inputs to the role of
microbial nitrogen-fixer community structure in
regulating nitrogen fixation rates. We found that
free-living nitrogen fixation was a dynamic process
that supplied diverse ecosystems with nitrogen, and
that we could elucidate multiple controls over this
important process.
Autorenporträt
These authors aim to study how terrestrial ecosystems work by
exploring the ways in which elements like carbon, nitrogen and
phosphorus cycle within the systems. They study both abiotic
and biotic controls over this biogeochemical cycling, and often
focus on how the structure and activity of microbial communities
help drive ecosystem function.