Unit 4: Energy flow and nutrient cycles
- Created by: s_rose
- Created on: 09-06-16 14:49
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- ENERGY FLOW AND NUTRIENT CYCLES
- Total energy available = 100%
- 60% not taken in: wrong wavelength, roots/bones or indigestible.
- 40% gross productivity
- 10% net productivity: available to next trophic level (gross productivity - respiratory loss)
- 30% respiratory loss
- Pyramid diagrams
- Pyramid of numbers: number of organisms in each trophic level
- Pyramid of biomass: smount of biomass in each trophic level
- Pyramid of energy: amount of energy available in each trophic level
- Intensive Farming Practices
- Kill pest species
- Chemical pesticides
- Biological agents
- Integrated system
- Fertilisers
- Natural - organic matter (manure or sewage sludge)
- Artificial - inorganic matter (pure chemicals e.g. ammonium nitrate)
- Rear livestock intensively
- Warm, indoor pens with restricted movement
- High energy feed
- Kill pest species
- The carbon cycle
- Combustion
- Photosynthe-sis
- Decompositio-n
- Respiration
- The nitrogen cycle
- Nitrification
- Ammonificati-on
- Denitrification
- Nitrogen fixation
- Total energy available = 100%
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