Changes between Version 161 and Version 162 of DevelopmentActivities/ORCHIDEE-DOFOCO

Timestamp:

2018-02-19T09:40:12+01:00 (6 years ago)

Author:

alanso

Comment:

--

DevelopmentActivities/ORCHIDEE-DOFOCO

@@ -234 +234 @@
 2 - The second possibility takes hydraulic architecture of plants into account, when calculating the plant water supply. This scheme, based on Hickler et al (2006), calculates the water supply as the ratio of the pressure difference between the soil and leaves. The plant water supply is the amount of  water the plant can transport from the soil to the stomate accounting for resistance of water transport in the roots, sapwood and leaves. The resistances are inversely proportional to the conductivities in these different tissues, with the sapwood conductivity decreasing when cavitations occurs. If transpiration rates exceeds plant water supply, stomatal conductance is reduced.
 
+Moreover, as a further refinement to the hydraulic architecture, a more detailed description of the soil to root resistance has been included (now the default setting) and is activated with the flag '''OK_SOIL_ROOT'''. In the original scheme of the hydraulic architecture a tuning factor was used to calculate the soil to root resistance (PHI_SOIL_TUNE). When '''OK_SOIL_ROOT''' = y, an adjustment of the soil water potential (phi_soilroot) due to soil to root resistance is allowed. Phi_soil is weighted by the fraction of evapotranspiration supplied by each soil layer, which depends on  the soil to root resistance per layer that accounts for different root properties and hydraulic conductivity.
+
 If you wish to make simulations with the hydraulic architecture the CWRR hydrology scheme needs to be activated  ('''HYDROL_CWRR'''=y). Moreover, both '''mleb''' and '''ok_hydrol_arch''' needs to be true. These can be controlled by the overall flag '''multi_layer_control''' (see section on Single layer vs. multi-layer energy budget for more elaboration on these flags).
 
-The following PFT dependent parameters are needed for the calculations accounting for plant hydraulic architecture; minimal leaf water potential '''PHI_LEAF_xx''', sapwood leaf water potential that causes 50 % loss of xylem '''PHI_50_xx''', additive tuning parameter to account for soil-root interactions '''PHI_SOIL_TUNE_xx''', maximum sapwood conductivity '''K_SAP_xx''', root conductivity '''K_ROOT_xx''', leaf conductivity '''K_LEAF_xx'''.
-
-EXPLAIN: SOIL_TO_ROOT. This is the new default. The other one is as a backup for DESIRE.
+The following PFT dependent parameters are needed for the calculations accounting for plant hydraulic architecture; minimal leaf water potential '''PHI_LEAF_xx''', sapwood leaf water potential that causes 50 % loss of xylem '''PHI_50_xx''', additive tuning parameter to account for soil-root interactions '''PHI_SOIL_TUNE_xx''', maximum sapwood conductivity '''K_SAP_xx''', root conductivity '''K_ROOT_xx''', leaf conductivity '''K_LEAF_xx''', specific root lenght '''SRL_xx''', fine root radius '''R_FROOT_xx''', minimum root water potential '''PHI_ROOT_xx'''.
 
 === Recruitment ===