Changes between Version 64 and Version 65 of Documentation/TrunkFunctionality4


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Timestamp:
10/28/20 11:19:20 (22 months ago)
Author:
jjeong
Comment:

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  • Documentation/TrunkFunctionality4

    v64 v65  
    166166 
    167167=== Equifinality === 
    168 XXX 
    169  
     168'''LAI''' 
     169* k_latosa \\ 
     170   Tested with r6818, PFT4. A nonlinear relationship between '''k_latosa''' and annual mean LAI was found. LAI saturated when k_latosa increased: 2500 to 4500 by 500. 
     171* Parameter compensations \\ 
     172   Tested with r6818, PFT4. 5 sets of parameters for PFT4 were replaced with the parameters for PFT7. \\\\ 
     173   set1: '''k_latosa, longevity_leaf, sla''' \\ 
     174   set2: '''arjv, vcmax25, coeff_maint_init''' \\ 
     175   set3: '''pipe_density, pipe_tune_*, tree_ff, alloc_min''' \\ 
     176   set4: '''psi_50, psi_leaf, k_sap, r_froot''' \\ 
     177   set5: '''leaf_psd_*, leaf_ssa_*, bgrd_ref_*, nir, vis''' \\ 
     178 
     179   Changes of set1 and set1 combined with set2 to set 5 (set1+set2, set1+set3, set1+set4 and set1+set5) increased LAI much (~2.5 -> ~7). However, change of all sets (set1+set2+set3+set4+set5) showed a moderate increase in LAI (~2.5 -> ~4) which implies parameter dependensies. 
    170180 
    171181=== Forced clear cut === 
     
    299309 
    300310=== Nitrogen reserve pools === 
    301 XXX 
     311Describes r6904. As the carbon, the model simulates two non-structural nitrogen pools: labile and reserve. Nitrogen uptake is stored in the labile pool, and after the growth, nitrogen exceeds the calculated potential labile pool moved to reserve nitrogen. Before the r6825, nitrogen limitation during plant growth was estimated using only labile nitrogen, and this resulted in the accumulation of reserve nitrogen. To deal with this issue, the functionality considers reserve nitrogen for estimating nitrogen limitation added to the r6825. The parameter '''use_reserve_n''' controls the functionality along with nitrogen uptake feedback which was added r6869 (See [wiki:TrunkFunctionality4#Rootnitrogenuptake Root nitrogen uptake]). 
    302312 
    303313=== Parameter files === 
     
    360370 
    361371=== Root nitrogen uptake === 
    362 Describes r6904. The calculation of root nitrogen uptake in nitrogen_dynamice has two parts. First, the maximum amount of root nitrogen uptake is calculated based on soil chemical properties and long-term root carbon mass. And then, nitrogen uptake is adjusted by the feedback from nitrogen reserve; if the long-term ratio of actual to potential nitrogen reserve pool is over one, then root nitrogen uptake decreases. The uptake does not decrease further than '''p_n_uptake'' of maximum root nitrogen uptake. The adjustment was added due to carbon limitation and too much nitrogen in the plant which was caused by using the reserve nitrogen as possible (See '''Nitrogen reserve pools'''), and it is controlled by the flag '''use_reserve_n''' to y. 
     372Describes r6904. The calculation of root nitrogen uptake in nitrogen_dynamice has two parts. First, the maximum amount of root nitrogen uptake is calculated based on soil chemical properties and long-term root carbon mass. And then, nitrogen uptake is adjusted by the feedback from nitrogen reserve; if the long-term ratio of actual to potential nitrogen reserve pool is over one, then root nitrogen uptake decreases. The uptake does not decrease further than '''p_n_uptake''' of maximum root nitrogen uptake. The adjustment was added due to carbon limitation and too much nitrogen in the plant which was caused by using the reserve nitrogen as possible (See [wiki:TrunkFunctionality4#Nitrogenreservepools Nitrogen reserve pools]), and it is controlled by the parameter '''use_reserve_n''' to y. 
    363373 
    364374