Check out this TES Resource which includes an animated Gersmehl diagram option.
Gersmehl diagrams were developed by Phil Gersmehl
They are particularly important when explaining the relative stores and flows of nutrients within an ecosystem. The thickness of the arrows or connectors and the size of the circles relates to the transfer or storage. For a rainforest, the nutrients are stored in the biomass for example, and nutrients move from the litter into the soil by decomposition and the work of detritivores.
I would imagine that they may end up being in the draft specification - perhaps only for UK based ecosystems e.g. deciduous woodland, heathland etc. but you never know.
e.g. a Tropical Rainforest.
Image source:
https://thatbiothing.wixsite.com/ecologyconservation/single-post/2015/12/07/the-gersmehl-cycles-nutrient-cycles
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