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DTSTAMP:20260829T210027Z
DESCRIPTION:Uptake of water by plant roots is a major component of the soil
  water balance and an accurate simulation of this process is a prerequisit
 e to simulate soil water fluxes and transport processes in the soil profil
 e accurately. A reduction in water uptake when soils dry out leads to wate
 r stress of the vegetation which has an impact on growth. Therefore\, accu
 rately simulating root water uptake is also important for predicting veget
 ation/crop growth and associated with it carbon assimilation. To improve t
 he mechanistic description of this process\, we developed a simulation mod
 el that simulates the flow process in the three-dimensional root system ar
 chitecture and coupled it to a description of flow in the soil. With this 
 model\, the impact of root system architecture and of the hydraulic proper
 ties of root segments and of the soil just around roots on the uptake capa
 city by the root system can be assessed and accounted for. Processes like 
 root water uptake compensation\, i.e.\, an increased uptake from wetter so
 il layers when part of the root zone dries out\, and hydraulic redistribut
 ion\, i.e.\, exudation of water by the root system and transfer of water f
 rom wetter to drier zones in the soil profile via the root system\, are di
 rectly simulated by the model and do not require further parameterization.
  However\, the description of three-dimensional flow comes with a high com
 putational cost and makes it impossible to simulate processes at the field
  and landscape scales. Therefore\, we developed upscaling approaches that 
 describe uptake without representing flow to and in individual root segmen
 ts. We found that these approaches show similarities but also some differe
 nces with empirical and macroscopic uptake models that are currently used 
 in one-dimensional soil water balance models. By upscaling of the local me
 chanistic flow process models\, the parameters of the macroscopic models c
 an be linked directly to soil and root system properties. This opens ways 
 to link root water uptake models to plant development models and to includ
 e two way feedbacks between drought and plant growth in these models.\n&nb
 sp\;\n*** invited by BayCEER-member Efstathios Diamantopoulos
DTSTART;TZID=Europe/Berlin:20231026T000000
DTEND;TZID=Europe/Berlin:20231026T235959
SUMMARY:Prof. Jan Vanderborght\, Director Institute of Bio- and Geosciences
  IBG-3: Agrosphere\, Forschungszentrum Jülich GmbH (Homepage): Modelling r
 oot water uptake: from root segments up to the field plot scale
TRANSP:TRANSPARENT
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