The nitrogen cycle describes how and where these transformations occur. A schematic of the terrestrial (land-based) nitrogen cycle is shown in the diagram below. This cycle also includes the human influences which have shaped the nitrogen cycle - particularly over the last century.. 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 series of processes by which nitrogen and its different forms are circulated and interconverted in nature with the help of living organisms is called the nitrogen cycle. It shows the path that nitrogen follows through the biogeochemical cycle using its storage reservoirs, such as the atmosphere, living organisms, and soil.. The diagram of nitrogen cycle is crucial for understanding its various steps. Through these steps, nitrogen transitions between organic and inorganic states, supporting plant growth, sustaining ecosystems, and influencing water quality.