Relate GPP, NPP and respiration, calculate productivity percentages and units, and trace how photosynthetic products contribute to biomass and carbon cycling.
Stages of succession can be seen on different parts of a sand dune system.
The greater the distance of the sand dune from the sea, the later the stage of succession.
The diagram shows a sand dune system and the table gives some information about the different types of sand dune in this system.
Sand dunes can be classified as fixed dunes, semi-fixed dunes and shifting dunes.
The graph shows the mean net primary productivity (NPP) above the ground and below the ground for these three types of sand dune.
Describe the conclusions that can be drawn from this graph.
Explain how the products of the light-independent reactions become NPP below the ground.