TY  - JOUR
AU  - Jorda, Helena
AU  - Huber, Katrin
AU  - Kunkel, Asta
AU  - Vanderborght, Jan
AU  - Javaux, Mathieu
AU  - Oberdörster, Christoph
AU  - Hammel, Klaus
AU  - Schnepf, Andrea
TI  - Mechanistic modeling of pesticide uptake with a 3D plant architecture model
JO  - Environmental science and pollution research
VL  - 28
IS  - 39
SN  - 0944-1344
CY  - Heidelberg
PB  - Springer
M1  - FZJ-2021-04469
SP  - 55678 - 55689
PY  - 2021
AB  - Meaningful assessment of pesticide fate in soils and plants is based on fate models that represent all relevant processes. With mechanistic models, these processes can be simulated based on soil, substance, and plant properties. We present a mechanistic model that simulates pesticide uptake from soil and investigate how it is influenced, depending on the governing uptake process, by root and substance properties and by distributions of the substance and water in the soil profile. A new root solute uptake model based on a lumped version of the Trapp model (Trapp, 2000) was implemented in a coupled version of R-SWMS-ParTrace models for 3-D water flow and solute transport in soil and root systems. Solute uptake was modeled as two individual processes: advection with the transpiration stream and diffusion through the root membrane. We set up the model for a FOCUS scenario used in the European Union (EU) for pesticide registration. Considering a single vertical root and advective uptake only, the root hydraulic properties could be defined so that water and substance uptake and substance fate in soil showed a good agreement with the results of the 1D PEARL model, one of the reference models used in the EU for pesticide registration. Simulations with a complex root system and using root hydraulic parameters reported in the literature predicted larger water uptake from the upper root zone, leading to larger pesticide uptake when pesticides are concentrated in the upper root zone. Dilution of root water concentrations at the top root zone with water with low pesticide concentration taken up from the bottom of the root zone leads to larger uptake of solute when uptake was simulated as a diffusive process. This illustrates the importance of modeling uptake mechanistically and considering root and solute physical and chemical properties, especially when root-zone pesticide concentrations are non-uniform.
LB  - PUB:(DE-HGF)16
C6  - 34142318
UR  - <Go to ISI:>//WOS:000662916500010
DO  - DOI:10.1007/s11356-021-14878-3
UR  - https://juser.fz-juelich.de/record/902682
ER  -