nitrogen cycle
Let an agent explain the nitrogen cycle, relay processes, organisms, human impacts and management from ecology, soil science and environmental sources with assessments attributed, and distinguish the nitrogen cycle from the carbon and phosphorus cycles, nitrogen narcosis and the aquarium nitrogen cycle as a practical subset.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent explain the nitrogen cycle, relay processes, organisms, human impacts and management from ecology, soil science and environmental sources with assessments attributed, and distinguish the nitrogen cycle from the carbon and phosphorus cycles, nitrogen narcosis and the aquarium nitrogen cycle as a practical subset.
The biogeochemical cycle by which nitrogen moves between the atmosphere, soils, water and living organisms, through nitrogen fixation by bacteria and lightning converting atmospheric N2 into ammonia, nitrification by microbes oxidising ammonia to nitrite and nitrate, assimilation into proteins and nucleic acids, ammonification during decomposition, and denitrification and anammox returning nitrogen gas to the air; since the Haber-Bosch process was industrialised in 1913, human production of reactive nitrogen for fertiliser has roughly doubled nitrogen inputs to land, causing water pollution, eutrophication and nitrous oxide emissions, a planetary boundary concern, with assessments attributed.
What it is for: Understanding nitrogen movement in ecosystems.
It can be explain processes and organisms; relay human impacts; describe management approaches; distinguish related cycles.
Distinguishing features
Microbial transformations
Fixation bottleneck
Human amplification
Pollution consequences
What it looks like
Not a physical object; illustrated as flows between air, soil, water and life.
Physical character
atmosphere nitrogen: about 78 percent - by volume
Haber-Bosch industrialised: 1913 year - BASF Oppau
anammox discovered: 1990s note
How it is recognised
Movement of nitrogen through Earth systems
Nitrogen cycle, N cycle
The carbon cycle moves carbon; the phosphorus cycle has no major gas phase; nitrogen narcosis is a diving effect; aquarium cycling is a practical application
Related models
is a kind of - in registry terms
includes -
is altered by -
is contrasted with -
In practice
Families and kinds
nitrogen fixation
nitrification
denitrification
ammonification
anammox
Standards and regulation
EU Nitrates Directive
Water quality standards for nitrate
Fertiliser regulations
Failure modes and hazards
Nitrate pollution of drinking water
Eutrophication and dead zones
Partisan framing of farming regulation
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.nitrogen-cycle
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Understand What the nitrogen cycle is.
Science.
Definition
Definition.
Definition
Definition.
- What is the nitrogen cycle, and how does it differ from the carbon and phosphorus cycles, nitrogen narcosis and aquarium cycling? definition
- Is the question about ecology, farming, pollution or aquariums? boundary
Processes
Processes.
Processes
Processes.
- What are fixation, nitrification, assimilation, ammonification, denitrification and anammox? definition
- Which entry fits the specific process? action
Biology Microbes.
Science.
Fixation
Nitrogen fixation.
Fixation
Fixation.
- How do Rhizobium and other bacteria fix nitrogen with nitrogenase? provenance
- Which references are standard? provenance
Nitrifiers
Nitrifying microbes.
Nitrifiers
Nitrifiers.
- Which microbes carry out nitrification and denitrification? provenance
- Which sources are cited? provenance
Human impact Human impact.
Attribution.
Haber-Bosch
Haber-Bosch.
Haber-Bosch
Haber-Bosch.
- How did the Haber-Bosch process transform food production and the nitrogen cycle? provenance
- Which entry fits Haber process? action
Pollution
Nitrogen pollution.
Pollution
Pollution.
- What do assessments say about nitrogen pollution and planetary boundaries, and what policies are debated, with positions attributed? provenance
- Is the presentation neutral and attributed? boundary
Context Applications.
Context.
Aquarium
Aquarium cycling.
Aquarium
Aquarium.
- How do aquarists establish the nitrogen cycle to protect fish? provenance
- Which entry fits fishless cycling? action
Farming
Nutrient management.
Farming
Farming.
- How do cover crops and precision fertilising reduce losses? provenance
- Which entry fits nutrient management? action
What the second pass must settle
- Should each process be a separate entry?
- How should planetary boundary assessments be linked?
- How should nitrogen policy debates be presented?