Agricultural ecosystems

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What is gross productivity measured in?
kJm-2 year-1
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What is net productivity affected by?
Efficiency of the crop at carrying out photosynthesis - area of the ground covered by crop
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Features of a natural ecosystem
Solar energy only; low productivity; more species diversity; genetic diversity; nutrients recycle naturally; pop controlled naturally; natural climax community
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Features of agricultural ecosystems
Energy from food & fossil fuels; high productivity; low species + genetic diversity; artificial fertilisers; artificial community
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Explain how the intensive rearing of domestic livestock increases net productivity
Slaughtered when young so more energy transferred into biomass; fed on controlled diet so more food absorbed; movement restricted so less respiratory losses; confined so less heat loss; genetically selected for high productivity
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Main features of intensive rearing
Disease; low cost; efficient energy conversion; reduced genetic diversity; quality of food
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Other cards in this set

Card 2

Front

What is net productivity affected by?

Back

Efficiency of the crop at carrying out photosynthesis - area of the ground covered by crop

Card 3

Front

Features of a natural ecosystem

Back

Preview of the front of card 3

Card 4

Front

Features of agricultural ecosystems

Back

Preview of the front of card 4

Card 5

Front

Explain how the intensive rearing of domestic livestock increases net productivity

Back

Preview of the front of card 5
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