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Nitrogen

Key component of bodys in living organisms

Cycle of nitrogen

Limiting nutrient

Bodys cant convert N2 into usable form

Terrestial ecosystem

Marine ecosystem

Nitrogen enter living world by bacteria

Change nitrogen to biological usavle forms

Capture atmospheric nitrogen by converting to ammonia

1

2

make organic molecule

are passed to animals when plants are eaten

3

incorporate to animal body

broken down and excreted as waste

Convert back to N2 gas

4

In dead organisms are converted into ammonia

Same process

Concentration of nitrogen changes in deepness

Is found in all proteins and DNA

Nitrogen containing compounds fall to the ocean

Sediments compress

Steps

By nitrogen fixation

Take by plants

or

By bacteria

Long period of time

Creates sedimentary rocks

Geological uplift moves sedimentary rock to land

Nitrogen releases gradually to plants from the rocks

Human activity afcets nitrogen cycling

Fertalizers containing nitrogen

Combustion of fossil fuels

Increase level of nitrogen containing compounds in the atmosphere

Harmful effects

Acid Rain

Contribution to the greenhouse effect

Excess fertalizer

Washed into lakes, steams and rivers

nutrients runoff causes overgrowth

Reduces oxygen in celular respiration

dead zones

Production and decomposition limited by nitrogen

limits growth of organisms or population

Limiting nutrient

How to know?

Adding more of it increases growth

Non-limiting nutrients, added has no effect