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Energy transfer
NPP=GPP-R
| Question | Answer |
|---|---|
| What do plants do in a ecosystem | Plants are the producers in a food web as they are able to produce there own carbohydrates using carbon dioxide in the atmosphere or water. |
| How is energy lost | Each trophic level in a food web majority of the energy lost is due to respiration and excretion. The remaining energy is used to form the biomass. |
| What is the amount of biomass in a organism measured in | This can be in terms of mass of carbon or dry mass of tissue per given area. |
| What is GPP | This is the chemical energy store in a plants biomass in a given area or volume. It is the total energy resulting from photosynthesis. |
| What is NPP | The chemical energy store in plants biomass taking account the energy that will be lost due to respiration (R) |
| NPP=GPP-R | The NPP is the energy left over that is available to the plant to create new biomass and therefore available to the next trophic level in a food web |
| To work out net production of consumers | N=I-(F+R) I= The chemical energy store in the ingested food F=The chemical energy lost to the enviroment in faeces and urine R= Respiratory losses |
| How is the rates of productivity recorded | kJ ha-1 year-1 |
Created by:
yHya