| Biomass definitions and units | the mass of carbons in an organisms / measured as dry mass of tissue per unit area |
| Calorimeter used to measure energy value of certain biomass | 1. Dry the sample ( hot oven at 80 degrees)
2. Burn it in presence of 100% oxygen
3.Measure the energy released by recording the temp change of surrounding water |
| Why does an oak tree's biomass change over the year | More photosynthesis in summer so more glucose so can be used to grow so biomass increases |
| what is GPP | chemical energy sotred IN PLANT BIOMASS
Measured in Joules of all organic molecules made due to photosynthesis |
| NPP | chemical energy store left in plants biomass after respirator loss |
| what is the equation linking it together | NPP= GPP-R |
| What increases NPP | Using fertilisers to increase growth
using herbicides to limit interspecific competition from competing weed species
hedgegrows are removed to make space for crop species
growing crops in greenhouses control of limiting factors |
| % effiency of energy transfer | energy after/ energy before x 100 |
| The equation for net production | N=I - (F+R) |
| What does shows trophic levels | a food chain shows the path of energy from one living organisms to another |
| trophic levels shows | producer -primary consumer - secondary consumer - tertiary consumer |
| What are decomposers | microgranisms that break down detritus |
