A5040944852- Irrigation Practices and Water Management
- Plant nutrient uptake and metabolism
- Soil and Unsaturated Flow
- Soil Moisture and Remote Sensing
- Plant Water Relations and Carbon Dynamics
- Plant responses to water stress
- Rice Cultivation and Yield Improvement
- Tree Root and Stability Studies
- Hydrology and Watershed Management Studies
- Plant Molecular Biology Research
- Greenhouse Technology and Climate Control
- Soil Management and Crop Yield
- Geophysical and Geoelectrical Methods
- Horticultural and Viticultural Research
- Soil Geostatistics and Mapping
- Forest ecology and management
- Seedling growth and survival studies
- Soil erosion and sediment transport
- Advanced Differential Equations and Dynamical Systems
- Groundwater flow and contamination studies
- Magnetic and Electromagnetic Effects
- Mathematical Dynamics and Fractals
- Geophysical Methods and Applications
- Spectroscopy Techniques in Biomedical and Chemical Research
- Silicon Effects in Agriculture
UCLouvain
2014-2024
Molina Center for Energy and the Environment
2022
Life Science Institute
2019
Centre de Référence Déficits Immunitaires Héréditaires
2018
University of California, Davis
2014-2017
Laboratoire d'Écophysiologie Moléculaire des Plantes sous Stress Environnementaux
2017
RWTH Aachen University
2010
Abstract. Many hydrological models including root water uptake (RWU) do not consider the dimension of system hydraulic architecture (HA) because explicitly solving flow in such a complex is too time consuming. However, they might lack process understanding when basing RWU and plant stress predictions on functions variables as length density distribution. On basis analytical solutions simple HA, we developed an "implicit" model HA for simulation distribution (sink term Richards' equation)...
The process description of plant transpiration and soil water uptake in macroscopic root models is often based on simplifying assumptions that no longer reflect, or even contradict, the current status knowledge biology. sink term Richards equation for generally comprises four terms: (i) a resistance function, (ii) (iii) stress (iv) compensation function. Here we propose to use detailed three‐dimensional model, which integrates flow equations, deduct one‐dimensional effective behavior at...
Abstract. A good understanding of the soil water content (SWC) distribution at field scale is essential to improve management water, and crops. Recent studies proved that Electrical Resistivity Tomography (ERT) opens interesting perspectives in determination SWC 3 dimensions (3-D). This study was conducted (i) check validate how ERT able monitor a maize during late growing season; (ii) investigate plants rainfall affect dynamics distribution. Time Domain Reflectometry (TDR) measurements were...
Core Ideas Parameters of different RWU models were optimized using data from a rhizotron facility. The same soil hydraulic properties obtained for considering compensation. Feddes–Jarvis and Couvreur predicted similar root‐system‐scale stress functions. parameters consistent with reported in the literature. compensation total uptake but local RWU. spatiotemporal distribution root water (RWU) depends on dynamics compensatory wetter regions zone. This work aimed to parameterize three...
Plant roots exhibit plasticity in their branching patterns to forage efficiently for heterogeneously distributed resources, such as soil water. The xerobranching response represses lateral root formation when lose contact with Here, we show that is regulated by radial movement of the phloem-derived hormone abscisic acid, which disrupts intercellular communication between inner and outer cell layers through plasmodesmata. Closure these pores inward signal auxin, blocking branching. Once tips...
Abstract Plant water uptake and plant soil status are important for the balance growth. They depend on atmospheric demand accessibility of to roots, which is in turn related hydraulic properties root system around segments. We present a simulation model that describes flow soil–plant mechanistically considering both properties. developed an approach upscale three‐dimensional (3D) toward segments 3D architecture considers one‐dimensional between horizontal layers radial layer. The upscaled...
Abstract Soil water availability for plant transpiration is a key concept in agronomy. The objective of this study to revisit and discuss how it may be affected by processes locally influencing root hydraulic properties. A physical limitation soil terms maximal flow rate available leaves ( ) defined. It expressed isohydric plants, plant‐centered variables properties (the equivalent potential sensed the plant, ; system conductance, threshold leaf potential, ). resulting compared commonly used...
As water often limits crop production, a more complete understanding of plant capture and transport is necessary. Here, we developed MECHA, mathematical model that computes the flow across root at scale walls, membranes, plasmodesmata individual cells, used it to test hypotheses related in maize (Zea mays). The uses detailed anatomical descriptions minimal set experimental cell properties, including conductivity plasma plasmodesmata, which yield quantitative scale-consistent estimations...
Core Ideas Leaching below the root zone is estimated based on eight sites of intensive vadose monitoring. Across methods N losses at annual orchard scale were in same order magnitude. Simple mass balance provided a good proxy accumulation soil Under current BMP load to groundwater likely range 60 100 kg ha–1. Large spatial and temporal variability water flow transport dynamics poses significant challenges accurately estimating form orchards. A 2‐yr study was conducted explore nitrate (NO 3 −...
Abstract Water potential explains water transport in the soil–plant–atmosphere continuum (SPAC), and is gaining interest as connecting variable between ‘pedo-, bio- atmosphere’. It primarily used to simulate hydraulics SPAC, thus essential for studying drought effects. Recent implementations of large-scale terrestrial biosphere models (TBMs) improved their performance under water-limited conditions, while hydraulic features recent detailed functional–structural plant (FSPMs) open new...
Abstract. Soil water potential (SWP) is known to affect plant status, and even though observations demonstrate that SWP distribution around roots may limit availability, its horizontal heterogeneity within the root zone often neglected in hydrological models. As motive, using a discretisation significantly larger than one centimetre essential for computing time considerations, especially large-scale hydrodynamics In this paper, we simulate soil system at scale evaluate approaches upscale...
Background and Aims Radial axial hydraulic conductivities are key parameters for proper understanding modelling of root water uptake. Despite their importance, there is limited experimental information on how the radial vary along roots growing in soil. Here, a new approach was introduced to estimate inversely profile transpiring plants Methods A three-dimensional model uptake used reproduce measured lupine plant grown The fluxes using neutron radiography technique combined with injection...
Abstract Trees grow by vertically extending their stems, so accurate stem hydraulic models are fundamental to understanding the challenges faced tall trees. Using a literature survey, we showed that many tree species exhibit continuous vertical variation in traits. To examine effects of this on function, developed spatially explicit, analytical water transport model for stems. Our allows Huber ratio, stem‐saturated conductivity, pressure at 50% loss leaf area, and transpiration rate vary...
Core Ideas An experimental setup was designed to observe and accurately locate hydraulic lift. Water stable isotope enrichment observed in topsoil layers. The results could be successfully reproduced using a 3D soil–root model. This study tested method quantify lift (HL, defined as the passive upward water flow from wetter dryer soil zones through plant root system) by combining an experiment 1 H 2 18 O tracer with soil–plant Our methodology consisted (i) establishing initial conditions for...
The plasma membrane intrinsic protein PIP2;5 is the most highly expressed aquaporin in maize (
Abstract. Root water uptake is an important process in the terrestrial cycle. How this depends on soil content, root distributions, and properties a soil–root hydraulic problem. We compare different approaches to implement hydraulics macroscopic flow land surface models. By upscaling three-dimensional architecture model, we derived exact model. The model uses following three characteristics: system conductance, Krs, standard fraction, SUF, which represents from profile with uniform head,...
In this manuscript, we propose a new method to calculate water flow and xylem potential distribution in hydraulic architectures (such as root systems) of any complexity. It is based on the extension equation analytical resolution Landsberg Fowkes for single roots. consists splitting systems zones homogeneous or homogeneously changing properties deriving under given boundary conditions (plant transpiration collar potential, at soil-root interfaces) without assuming uniform within each zone....
Abstract A key impediment to studying water-related mechanisms in plants is the inability non-invasively image water fluxes cells at high temporal and spatial resolution. Here, we report that Raman microspectroscopy, complemented by hydrodynamic modelling, can achieve this goal - monitoring hydrodynamics within living root tissues cell- sub-second-scale resolutions. imaging of water-transporting xylem vessels Arabidopsis thaliana mutant roots reveals faster transport endodermal diffusion...
Predicting root water uptake and plant transpiration is crucial for managing irrigation developing drought-tolerant system ideotypes (i.e. ideal systems). Today, three-dimensional structural functional models exist, which allows solving the flow equation in soil systems under transient conditions heterogeneous soils. Yet, these rely on full representation of distribution hydraulic properties, not always easy to access. Recently, new able represent this complex without knowledge 3D...