305 | 305 | The following PFT dependent parameters are needed for the calculations accounting for plant hydraulic architecture; minimal leaf water potential '''psi_leaf''', sapwood leaf water potential that causes 50 % loss of xylem '''psi_50''', maximum sapwood conductivity '''k_sap''', root conductivity '''k_root''', leaf conductivity '''k_leaf''', specific root lenght '''srl''', fine root radius '''r_froot''', minimum root water potential '''psi_root'''. Moreover, as a further refinement to the hydraulic architecture, a more detailed description of the soil to root resistance has been included. This overcomes the need of psi_soil_tune in ORCHIDEE trunk as needed in ORCIDEE-CAN. Psi_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. In ORCHIDEE-CAN '''k_root''' described the conductivity of the fine roots and the soil. In ORCHIDEE trunk this joined conductivity has been split in a fine root conductivity and a soil to root conductivity. '''k_root''' is solely used in the calculation of the hydraulic architecture (because k soil to root is calculated separately in that subroutine), '''k_belowground''' is solely used in allocation. Hence, allocation and hydraulic architecture are no longer intimately linked. |