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Nitrogen cycle
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The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmospheric, terrestrial, and marine ecosystems. The conversion of nit
Global cycling of reactive nitrogen including industrial fertilizer production, nitrogen fixed by natural ecosystems, nitrogen fixed by oceans, nitrog
Global cycling of reactive nitrogen including industrial fertilizer production, nitrogen fixed by natural ecosystems, nitrogen fixed by oceans, nitrogen fixed by agricultural crops, NOx emitted by biomass burning, NOx emitted from soil, nitrogen fixed by lightning, NH3 emitted by terrestrial ecosystems, deposition of nitrogen to terrestrial surfaces and oceans, NH3 emitted from oceans, ocean NO2 emissions from the atmosphere, denitrification in oceans,
Classical representation of nitrogen cycle
Classical representation of nitrogen cycle
Marine nitrogen cycle
Marine nitrogen cycle
The main studied processes of the N cycle in different marine environments. Every coloured arrow represents a N transformation: N 2 fixation (red), ni
The main studied processes of the N cycle in different marine environments. Every coloured arrow represents a N transformation: N 2 fixation (red), nitrification (light blue), nitrate reduction (violet), DNRA (magenta), denitrification (aquamarine), N-damo (green), and anammox (orange). Black curved arrows represent physical processes such as advection and diffusion.
Nitrogen fixation
Videos
Nitrogen fixation is a chemical process by which the abundant but relatively inert molecular dinitrogen is converted into bioavailable nitrogen compounds such as ammonia and nitrates. It occurs both b
Nitrogen cycle
…ecosystems. The conversion of nitrogen can be carried out through both biological and physical processes. Important processes in the nitrogen cycle include fixation, ammonification, nitrification, and denitrification. The majority of Earth's atmosphere (78%) is atmospheric nitrogen, making it the largest source of…
Nodules are visible on this broad bean root
Nodules are visible on this broad bean root
A sectioned alder tree root nodule
A sectioned alder tree root nodule
Lightning heats the air around it in a high-temperature plasma, breaking the bonds of N 2, starting the formation of nitrous acid (HNO 2).
Lightning heats the air around it in a high-temperature plasma, breaking the bonds of N 2, starting the formation of nitrous acid (HNO 2).
Equipment for a study of nitrogen fixation by alpha rays (Fixed Nitrogen Research Laboratory, 1926)
Equipment for a study of nitrogen fixation by alpha rays (Fixed Nitrogen Research Laboratory, 1926)