Nutrient Cycle
- Created by: emma
- Created on: 22-11-14 15:36
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- Nutrient Cycle
- Carbon cycle
- Plants take up C from atmosphere as CO2 via stoma
- C fixed in photosynthesis to organic molecuels
- 1 Consumers eat producer and C compounds are digested absorbed then assimilated
- 2 Consumer eats 1 Consumer and C compounds passed along food chain
- Indigestible C egested as faeces
- C in dead plants and animals broken down by decomposers
- Respiration by decomposers releases CO2
- Respiration of producers and consumers releases CO2
- Respiration by decomposers releases CO2
- C in dead plants and animals broken down by decomposers
- Indigestible C egested as faeces
- 2 Consumer eats 1 Consumer and C compounds passed along food chain
- 1 Consumers eat producer and C compounds are digested absorbed then assimilated
- C fixed in photosynthesis to organic molecuels
- Plants take up C from atmosphere as CO2 via stoma
- Nitrogen Cycle
- Plants take up N in the soil as NO3 by active transport via root hair cells
- Plants use N for proteins
- Consumers eat plants and digest, absorb and assimilate N into new compounds
- Primary consumers eaten by secondary and N passes along food chain
- Plants and animals die, animals excrete waste
- Saprobiotic decomposers break N containing compounds into NH3 (ammonification)
- NH3 converted to nitrites then nitrates by nitrifying bacteria (nitrification)
- Some nitrates converted to N gases by denitrifying bacteria (denitrification)
- N gases converted back to NH3 by nitrogen fixing bacteria (nitrogen fixation)
- Some nitrates converted to N gases by denitrifying bacteria (denitrification)
- NH3 converted to nitrites then nitrates by nitrifying bacteria (nitrification)
- Saprobiotic decomposers break N containing compounds into NH3 (ammonification)
- Plants and animals die, animals excrete waste
- Primary consumers eaten by secondary and N passes along food chain
- Consumers eat plants and digest, absorb and assimilate N into new compounds
- Plants use N for proteins
- Plants take up N in the soil as NO3 by active transport via root hair cells
- Long term CO2 fluctuations
- Deforestation removes trees as carbon sinks reducing amount of CO2 taken up in photosynthesis
- Slash and burn method releases CO2 when trees burn
- Combustion of fossil fuels releases CO2, increased with the industrial revolution
- Deforestation removes trees as carbon sinks reducing amount of CO2 taken up in photosynthesis
- Short term CO2 fluctuations
- Day- more photosynthesis and less respiration by plants so decrease in CO2 levels
- Night- More respiration and no photosynthesis so increase in CO2 levels
- Little air movement causes a build up of CO2 at night
- Seasons- In winter shorter days, cooler temp, loss of leaves means a decrease in CO2 levels so increase in CO2 levels
- Global Warming
- Green house effect is a natural process where energy from the sun is reflected back into the atmosphere but prevented from escaping due to green house gases
- To much green house effect cause global warming
- Increase in methane
- Increase number of cattle, gut bacteria that break down cellulose produce CO2
- Rice cultivation in paddy fields are ideal for anaerobic bacteria that produce methan
- Crop yields may increase but other limiting factors may effect yield
- Pest numbers increase as rate of biological reactions speed up so shorter life cycle
- More generations of pest and more surviving winter
- Change in distribution of plants and animals
- Green house effect is a natural process where energy from the sun is reflected back into the atmosphere but prevented from escaping due to green house gases
- Carbon cycle
- Consumers eat plants and digest, absorb and assimilate N into new compounds
- Primary consumers eaten by secondary and N passes along food chain
- Plants and animals die, animals excrete waste
- Saprobiotic decomposers break N containing compounds into NH3 (ammonification)
- NH3 converted to nitrites then nitrates by nitrifying bacteria (nitrification)
- Some nitrates converted to N gases by denitrifying bacteria (denitrification)
- N gases converted back to NH3 by nitrogen fixing bacteria (nitrogen fixation)
- Some nitrates converted to N gases by denitrifying bacteria (denitrification)
- NH3 converted to nitrites then nitrates by nitrifying bacteria (nitrification)
- Saprobiotic decomposers break N containing compounds into NH3 (ammonification)
- Plants and animals die, animals excrete waste
- Primary consumers eaten by secondary and N passes along food chain
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