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nutrient cycles
A LevelBiology~4 min read
Overview
This lesson explores the vital nutrient cycles of carbon and nitrogen, essential for sustaining life on Earth. We will examine the processes, reservoirs, and organisms involved in the movement of these elements through ecosystems, highlighting their ecological significance and human impacts.
Introduction to Nutrient Cycles
Nutrient cycles, also known as biogeochemical cycles, describe the pathways by which chemical elements move through the biotic (living) and abiotic (non-living) components of an ecosystem. These cycles are fundamental to the sustainability of life on Earth, ensuring that essential elements like carb...
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Key Concepts
- Nutrient Cycle: The movement and exchange of organic and inorganic matter back into the production of living matter.
- Carbon Cycle: The biogeochemical cycle by which carbon is exchanged among the biosphere, pedosphere, geosphere, hydrosphere, and atmosphere of the Earth.
- Nitrogen Cycle: The biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmospheric, terrestrial, and marine ecosystems.
- Reservoir (Pool): A large natural or artificial lake used as a source of water supply, or a component of a biogeochemical cycle where a nutrient accumulates.
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Exam Tips
- →**Draw and Label Diagrams:** Practice drawing simplified diagrams of both the carbon and nitrogen cycles, clearly indicating reservoirs, fluxes, and the organisms involved in each step. This helps consolidate understanding and is often an exam question.
- →**Know the Organisms:** For the nitrogen cycle, specifically remember the names of the key bacteria involved in each step (e.g., *Rhizobium* for fixation, *Nitrosomonas* and *Nitrobacter* for nitrification, *Pseudomonas* for denitrification).
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