Ecosystems: Nutrient Cycles

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Presentation transcript:

Ecosystems: Nutrient Cycles

Let’s review

Causes of Deforestation Population explosion Large areas of forest have been cleaned for: Agriculture Factories Roads and rail tracks Industries mining/quarrying

Causes of Deforestation FIRES Forest fires destroy trees, seeds, and the animal life

Causes of Deforestation Pests Many kinds of insect pests destroy forests by eating shoots and spreading diseases.

Causes of Deforestation Grazing and gnawing animals Animals eat, trample the young plants, and damage their trunks and roots.

Other Causes of Deforestation: Weather: storms and snow damage the forests. Dams: Barriers constructed across rivers to prevent floods submerge and kill large tracts of forests.

How does deforestation affect the carbon cycle? Climate has become warmer in the deforested region due to lack of humidity added by the plants. Consumption of CO2 and production of O2 is adversely affected.

How does deforestation affect the water cycle? First lets talk about transpiration: Loss of water vapor through leaf stomata

How does deforestation affect the water cycle Trees store and transpire a lot of water (which is why rainforests remain humid) Take away trees- water is lost Moisture can’t be returned to atmosphere without plants Extensive cutting can turn forests into deserts Erosion occurs due to increased Runoff