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Process of Eutrophication

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Submitted By alvinak47
Words 272
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5.4.1 Outline the processes of eutrophication

Include increase in nitrates and phosphates leading to rapid growth of algae, accumulation of dead organic matter, high rate of decomposition and lack of oxygen. The role of positive feedback should be noted in these processes.

Eutrophication can have a devastating effect on rivers and streams. Normally nutrients such as nitrogen, phosphorous and potassium limit plant growth. Human inputs of these fertilizers into water systems cause rapid plant growth follwed by death of the plants, decomposition of the dead organic matter and subsequent loss of dissolved oxygen in the water

There are six stages:- PUT THE STAGES IN THE CORRECT ORDER. Add Images or sketches to visualize the process of eutrophication.

Oxygen is used up quickly by the huge numbers of microbes as they respire and decompose the organic matter. The DO, dissolved oxygen, decreases.

Fertilisers containing ntrogen. phosphorus and potassium used by farmers are leached from the soil. Animal manures from cattle containing nitrogen and some phosphorus runooffinto lakes and rivers.
Domestic inputs such as sewage containg nitrates and phospahtes empty into lakes and rivers

Fish and other aquatic animals may suffrocate due to lack of oxygen in the water.

When the fertilisers and domestic waste enter lakes and rivers, algal utilise these extra nutrients, growing rapidly. There is an increase in primary productivity. This is often called an algal bloom

Bacteria and other microbes feed on the dead plant material and decompose it., They rapidly increase in number.

These “algal blumes” block out sunlight for plants below them causing the death of these plants. The dead organic matter increases the...

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