Biogeochemical Cycles (Nutrient Cycles)

The biogeochemical cycle refers to the continuous movement of nutrients within an ecosystem between the abiotic (non-living) and biotic (living) components. Unlike the one-way flow of energy, nutrients are recycled in a circular process that ensures their availability for the growth of organisms.

Nutrients, such as carbon, nitrogen, and phosphorus, move between the lithosphere (land), atmosphere (air), and hydrosphere (water), which together form the biosphere. These nutrients are absorbed by plants from the soil, air, or water, then transferred to animals and other organisms through food chains. When plants and animals die or release waste, decomposers break down the organic matter, returning nutrients back to the abiotic environment.

Biogeochemical cycle

This cyclical process ensures a continuous supply of essential nutrients and is driven by energy transfer in the ecosystem. It is a vital system that maintains balance and supports the sustainability of life on Earth.

There are four main biogeochemical cycles

1. The Water Cycle
2. The Nitrogen Cycle
3. The Carbon Cycle
4. The Oxygen Cycle

The circular movement of nutrients between living organisms and the physical environment of an ecosystem is called biogeochemical cycle.