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Soil - PowerPoint PPT Presentation


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Foraging Ecosystem. Sun. Humans. Nutrients Fibers Drugs Decorations Etc. Energy. Labor: Collecting Processing. Air. Carbon, Oxygen. Nutrients Water. Useless plant. Useful plant. Soil. Shifting Agricultural Ecosystem. Sun. Humans. Nutrients Fibers Drugs Decorations Etc.

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Presentation Transcript
slide1

Foraging Ecosystem

Sun

Humans

Nutrients

Fibers

Drugs

Decorations

Etc.

Energy

Labor:

Collecting

Processing

Air

Carbon,

Oxygen

Nutrients

Water

Useless

plant

Useful

plant

Soil

slide2

Shifting Agricultural Ecosystem

Sun

Humans

Nutrients

Fibers

Drugs

Decorations

Etc.

Energy

Labor:

Clearing

Burning

Planting

Fencing

Weeding

Harvesting

Pest Control

Storage

Etc.

Air

Carbon,

Oxygen

Nutrients

Water

Useless

plant

Useful

plant

Soil

slide3

Shifting Agricultural Ecosystem

Sun

Humans

Nutrients

Fibers

Drugs

Decorations

Etc.

Energy

Labor:

Clearing

Burning

Planting

Fencing

Weeding

Harvesting

Pest Control

Storage

Etc.

Useful

plants

Air

Carbon,

Oxygen

Decomposition

Nutrients

Water

Useless

plant

Ashes

Less recently

farmed

More recently

farmed

Fallow area

Farmed

area

slide4

Intensive Agricultural Ecosystem

Sun

Labor energy

Water

source

Energy

Humans

Nutrients

Fibers

Drugs

Decorations

Etc.

Animals

Manure

(nutrients)

Traction

energy

Irrigation

Labor energy:

Plowing

Harrowing

Planting

Fencing

Weeding

Harvesting

Pest Control

Storage

Etc.

Air

Useful

plants

(crops)

Carbon,

Oxygen

Nutrients

Water

FARMLAND

slide5

Industrial Monocrop Agricultural Ecosystem

Sun

Consumer

goods

$

Humans

Energy

Exchange

Value

Air

-cides

Carbon,

Oxygen

Fertilizer

Single

crops

Nutrients

Water

source

Irrigation

Nutrients

Water

Machinery

energy: Plowing

Harrowing, Planting

Fencing, Weeding

Harvesting,

Pest Control, Storage, etc.

Fossil

Fuel

FARMLAND

agricultural intensification
Agricultural Intensification

Poplation

density

Surplus

Net energy/

land

Output/input ratio

Energy output per unit of land

Energy Input per unit of land

Foraging

Shifting

Agriculture

Intensive

Agriculture