Changes between Version 97 and Version 98 of Documentation/TrunkFunctionality4

04/08/21 12:25:10 (7 months ago)



  • Documentation/TrunkFunctionality4

    v97 v98  
    416416When thinking about root function it is not so important where the roots are located but it is more important at which depth the roots will be active. This seems a fair approach. Plants probably have way more roots than they need exactly to be able to quickly adjust to changes in the soil moisture environment. The function approach is used in the functional root profile where the plants can take most of the soil water from the layers where the soil water happens to be (feature added by D.Zhu in r4363. I'm not sure which versions this is in but we had it in trunk 4.0). The nodes and interfaces of the soil layers follow the scheme proposed by De Rosnay (PhD thesis). This is calculated in vertical_soil.f90. This way of looking at the roots is similar to how we look at the canopy where we have a lot of leaves at places in the canopy where little light can penetrate and where a large part of the photosynthesis is taken care of by the leaves in the top layers of the canopy. This functional approach is used in hydrol.f90 to calculate the water uptake from the soil for transpiration. It is also used in hydraulic architecture to calculate the water supply to the stomata and also the uptake of soil water from each soil layer. 
     418The implementation of the functional root profile would benefit from a more careful literature study. Here are some references on the topic:,,, and 
    418420In ok_soil_carbon_discretization many more soil depths are introduced. When testing this functionality with trunk 4.0 some of the options could be removed and the use of different soil depths could be checked for consistency, i.e., are the same nodes and interfaces used as in the rest of the model? Is it really a new depth or just another name of the same depth?