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Lecture notes

Nutrients in Ecosystems
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These lecture notes talk about nutrients in ecosystems, a bullet point layout of lecture notes surrounding this topic. The main points in these notes are; - Nutrient cycling and why study it. - Lack of nutrients that can limit ecosystem processes. - Excess nutrients that can limit ecosyste...

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  • May 13, 2023
  • 3
  • 2022/2023
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Nutrients in ecosystems
Nutrient cycling:

Is the movement of nutrients interlinked in a series of ‘fluxes’ between ‘stocks’.

- Entry of nutrients to ecosystem.

• Stocks: atmosphere, rock/soil, water, organisms.

• Internal fluxes among/between stocks include plants, microbes, consumers andn
their environment.

• Loss of nutrients to ecosystem.

Why study nutrient cycling:

• Provide key ‘ingredients’ for ecosystem functioning.

• Manage ecosystems to make best use of nutrients. For example, planning
nutrient requirements for agriculture.

• Predict future changes in inputs and outputs arising from human activity. For
example, land-use or other perturbations.

Lack of nutrients can limit ecosystem processes:

• Eroded moorlands.

• Ombrotrophic bogs and lakes.

• Rock faces.

• Cold and frozen ecosystems.

Excess nutrients can limit ecosystem process:

• Eutrophication.

• Salt water.

• Acidity.

• Metal rich soils.

Nutrient budgets

We need to know:

• Stocks (pools): the amount of nutrients in storage compartments.

• Fluxes: rates of exchange between the stocks.

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