Changes between Version 113 and Version 114 of Documentation/TrunkFunctionality4
 Timestamp:
 11/22/21 09:27:06 (6 months ago)
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Documentation/TrunkFunctionality4
v113 v114 432 432  PARAMETER LEAF_M_c (LAI)  ROOT_M_c  SUGAR_LOAD  PLANT_N_UPTAKE  433 433  K_LATOSA  K_LATOSA is used in the calculation of the leaf mass, tuning K_LATOSA will thus directly affect LAI. Increasing K_LATOSA will increase LAI up to the point where sugar_load becomes limiting  Root mass will follow the leaf mass as a fixed function of KF and c0_alloc  Increasing LAI requires more N to sustain the higher NPP, sugar_load kicks in when Nlimitations occurs and will decrease GPP and thus also NPP  Uptake increases proportional to the root mass but the Ndemand will increase proportional to the leaf mass  434  K_BELOWGROUND  Lai decreases because more C is now allocated to the roots so there is less C for the leaves. GPP will decrease but not as fast as LAI because there is more plant available N and leaf_m_n may increase  K_BELOWGROUND is used in the calculation of c0_alloc, tuning K_BELOWGROUND alters the ratio between leaf and root allocation. Increasing K_BELOWGROUND increases the root mass relative to the leaf mass but the absolute root mass may decrease due to the decrease in leaf mass.  Nstress will most likely decrease (the value of sugar_load will therefore increase) because the root mass and increase relative to the leaf mass. Hence, the supply of nitrogen increases whereas the demand is decreasing.  PLANT_N_UPTAKE increases because of an increase in root mass. 434  K_BELOWGROUND  Lai increases because less C is now allocated to the roots so there is more C for the leaves. GPP will increase but not as fast as LAI because there might be not enough plant available N  K_BELOWGROUND is used in the calculation of c0_alloc, tuning K_BELOWGROUND alters the ratio between leaf and root allocation. Increasing K_BELOWGROUND decreases the root mass relative to the leaf mass but the absolute root mass may increase due to the increase in leaf mass.  Nstress will most likely increase (the value of sugar_load will therefore decrease) because the root mass and decrease relative to the leaf mass. Hence, the supply of nitrogen decreases whereas the demand is increasing.  PLANT_N_UPTAKE decreases because of a decrease in root mass.  435 435  VMAX_UPTAKE  Increasing the N supply will allow growing larger canopies even if plant growth before parameter tuning was not Nlimited. Interestingly these large canopies may generate lots of gpp resulting in Nlimitation which will be reflected in a decreasing value of sugar loading.  Root mass will follow LAI. The absolute value of root mass will increase jointly with the increase in LAI.  Nstress will decrease (so sugar_load will increase). Nevertheless, the effect of increasing VMAX_UPTAKE was observed to level off.  PLANT_N_UPTAKE will increase up to the point that soil_n_min becomes the limiting factor. If this point is reached there will be consequences for litter and soil carbon decomposition and thus heterotrophic respiration.  436 436  COEFF_MAINT_RESP  More respiration leaves less carbon to be allocated to leaves and roots for a given LAI. Note that the absolute value of LAI will decrease.  More respiration leaves less carbon to be allocated to leaves and roots for a given LAI. Note that the absolute value of LAI will decrease.  For a given LAI the Ndemand will decrease (as a smaller fraction of the GPP will be allocated towards biomass growth which requires N) resulting in less Nstress (thus a higher value for sugar_load)  Following the decrease in the allocatable C, root mass will decrease resulting in less nitrogen uptake 