Plant allocation of trace elements

Allocation of trace elements to the grain pool from roots, leaves and stem is proportionate to the carbon allocation to these pools, multiplied by the trace element / carbon ratio of the source pool. Thus, the transfer of trace elements to grain from leaves, STELeaf→Grain, is calculated as:

                                                            (2.65)

where CLeaf→Grain is the allocation of carbon from leaves to grain. STECLeaf is the trace element / carbon ratio of the leaf:

                                                                                             (2.66)

where STELeaf is the trace element content of leaves and CLeaf is the carbon content of leaves. The transfers of tracers from roots to grain, STERoot→Grain, and from stem to grain, STEStem→Grain, are calculated analogously.

Trace element content in litterfall from leaves, stem, grain and roots are calculated in the same manner.

Every new years day, what remains of the trace elements the plant biomass after litterfall, will be transferred to pools for old plant material, i.e. STEOldLeaf, STEOldStem and STEOldRoots.