| A | B |
|---|
| primary productivity | rate at which plants convert light energy into chemical energy in carbohydrates and other nutrients |
| two units of primary productivity | kJ m2 yr or g m2 day |
| GPP | gross primary productivity |
| NPP | net primary productivity |
| Formula for NPP | NPP = GPP - respiration |
| Factors affecting primary productivity | plant capabilities, light intensity, day length, water, temp, CO2, inorganic ion availabiliy, competition, damage |
| Photosynthetic effeciency | Efficiency of turning light energy into chemical energy |
| Formula for PE | energy stored in new carbohydrates / energy falling on plant |
| Leaf area index formula | leaf area / ground area X 100 |
| PAR waveband | Photsynthetically active waveband |
| PE effecience usually less than.... | 8% |
| Approximate chloroplast effeciency | 20% |
