Daniel Leitner

Daniel Leitner
Simulationswerkstatt

Priv.-Doz. Dr.

About

80
Publications
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2,450
Citations

Publications

Publications (80)
Article
Full-text available
We reviewed soil modeling and the role of soil processes in quantifying ecosystem services. Key challenges were identified and the establishment of a soil modeling consortium to advance soil modeling activities, provide a data-model platform, perform model intercomparison and foster communication amongst Earth science disciplines is proposed.
Article
Development of arbuscular mycorrhizal fungal colonization of roots and the surrounding soil is the central process of mycorrhizal symbiosis, important for ecosystem functioning and commercial inoculum applications. To improve mechanistic understanding of this highly spatially and temporarily dynamic process, we developed a three-dimensional model t...
Article
Full-text available
Drought stress is a dominant constraint to crop production. Breeding crops with adapted root systems for effective uptake of water represents a novel strategy to increase crop drought resistance. Due to complex interaction between root traits and high diversity of hydrological conditions, modeling provides important information for trait based sele...
Article
Full-text available
The number of image analysis tools supporting the extraction of architectural features of root systems has increased over the last years. These tools offer a handy set of complementary facilities, yet it is widely accepted that none of these software tool is able to extract in an efficient way growing array of static and dynamic features for differ...
Article
Full-text available
Root system traits are important in view of current challenges such as sustainable crop production with reduced fertilizer input or in resource limited environments. We present a novel approach for recovering root architectural parameters based on image analysis techniques. It is based on a graph representation of the segmented and skeletonised ima...
Article
Full-text available
Accurate prediction of root growth and related resource uptake is crucial to accurately simulate crop growth especially under unfavorable environmental conditions. We coupled a 1D field-scale crop-soil model running in the SIMPLACE modeling framework with the 3D architectural root model CRootbox on a daily time step and implemented a stress functio...
Article
Full-text available
Soil hydraulic conductivity (k soil) drops significantly in dry soils, resulting in steep soil water potential gradients (ψ s) near plant roots during water uptake. Coarse soil grid resolutions in root system scale (RSS) models of root water uptake (RWU) generally do not spatially resolve this gradient in drying soils which can lead to a large over...
Article
Full-text available
In this study, we developed a novel model approach to compute the spatio-temporal distribution patterns of rhizodeposits around growing root systems in three dimensions. This model approach allows us to study the evolution of rhizodeposition patterns around complex three-dimensional root systems. Root systems were generated using the root architect...
Chapter
There are high expectations that plant breeding for improved root systems will substantially advance adaptation of crops to resource‐limited environments and climate change. Image‐based phenotyping technologies provide novel opportunities to characterize root systems and overcome traditional throughput limitation in sampling and analysis. This chap...
Article
Full-text available
Abstract Soils with high stone content represent a challenge to root development, as each stone is an obstacle to root growth. A high stone content also affects soil properties such as temperature or water content, which in turn affects root growth. We investigated the effects of all soil properties combined on root development in the field using b...
Preprint
Full-text available
In this study, we developed a novel model approach to compute the spatio-temporal distribution patterns of rhizodeposits around growing root systems in three dimensions. Root systems were generated using the root architecture model CPlantBox. The concentration of rhizodeposits at a given location in the soil domain was computed analytically. To sim...
Article
Soil mechanical impedance, hypoxia and water stress are the main soil physical causes of reduced root growth, but they are rarely included in root growth models. The aim of this work was to study the impact of soil compaction on soybean root growth in an Oxisol using extensive field data as well as a mechanistic model that is sensitive to soil phys...
Article
Full-text available
Three-dimensional models of root growth, architecture and function are becoming important tools that aid the design of agricultural management schemes and the selection of beneficial root traits. However, while benchmarking is common in many disciplines that use numerical models, such as natural and engineering sciences, functional-structural root...
Article
Full-text available
The interaction between carbon and flows within the vasculature is at the center of most growth and developmental processes. Understanding how these fluxes influence each other, and how they respond to heterogeneous environmental conditions, is important to answer diverse questions in agricultural and natural ecosystem sciences. However, due to the...
Article
Full-text available
The interaction between carbon and flows within the vasculature is at the center of most growth and developmental processes. Understanding how these fluxes influence each other, and how they respond to heterogeneous environmental conditions, is important to answer diverse questions in agricultural and natural ecosystem sciences. However, due to the...
Article
Full-text available
Soil mechanical resistance, aeration, and water availability directly affect plant root growth. The objective of this work was to identify the contribution of mechanical and hydric stresses on maize root elongation, by modeling root growth while taking the dynamics of these stresses in an Oxisol into consideration. The maize crop was cultivated und...
Preprint
Full-text available
The interaction between carbon and flows within the plant is at the center of most growth and developmental processes. Understanding how these fluxes influence each other, and how they respond to heterogeneous environmental conditions, is important to answer diverse questions in forest, agriculture and environmental sciences. However, due to the hi...
Preprint
Full-text available
Three-dimensional models of root growth, architecture and function are becoming important tools that aid the design of agricultural management schemes and the selection of beneficial root traits. However, while benchmarking is common in many disciplines that use numerical models such as natural and engineering sciences, functional-structural root a...
Article
Full-text available
Aims Traits of the plant root system architecture (RSA) play a key role in crop performance. Therefore, architectural root traits are becoming increasingly important in plant phenotyping. In this study, we use a mathematical model to investigate the sensitivity of characteristic root system measures, obtained from different classical field root sam...
Article
In the recent years, many computational tools, such as image analysis, data management, process-based simulation and upscaling tools, were developed to help quantify and understand water flow in the soil-root system, at multiple scales (tissue, organ, plant and population). Several of these tools work together or, at least, are compatible. However,...
Article
Full-text available
Background Root phenotyping aims to characterize root system architecture because of its functional role in resource acquisition. RGB imaging and analysis procedures measure root system traits via colour contrasts between roots and growth media or artificial backgrounds. In the case of plants grown in soil-filled rhizoboxes, where the colour contra...
Article
Full-text available
Background and aimsRoot elongation is generally limited by a combination of mechanical impedance and water stress in most arable soils. However, dynamic changes of soil penetration resistance with soil water content are rarely included in models for predicting root growth. Better modelling frameworks are needed to understand root growth interaction...
Preprint
Full-text available
In the recent years, many computational tools, such as image analysis, data management, process-based simulation and upscaling tools, were developed to help quantify and understand water flow in the soil-root system, at multiple scales (tissue, organ, plant and population). Several of these tools work together or, at least, are compatible. However,...
Article
Full-text available
Background and aims: Root architecture development determines the sites in soil where roots provide input of carbon and take up water and solutes. However, root architecture is difficult to determine experimentally when grown in opaque soil. Thus, root architecture models have been widely used and been further developed into functional-structural...
Article
Full-text available
Better understanding of plant root dynamics is essential to improve resource use efficiency of agricultural systems and increase the resistance of crop cultivars against environmental stresses. An experimental protocol is presented for RGB and hyperspectral imaging of root systems. The approach uses rhizoboxes where plants grow in natural soil over...
Article
Full-text available
Root phenotyping provides trait information for plant breeding. A shortcoming of high throughput root phenotyping is the limitation to seedling plants and failure to infer on mature root systems. We suggest root architecture (RSA) models to predict mature root traits and overcome the inference problem. Sixteen pea genotypes were phenotyped in (i) s...
Research
Full-text available
Plant phenotyping methods based on architectural root traits to develop new genotypes are becoming increasingly important. These traits play a key role for crop performances under non-optimal environmental and climatic conditions. However, the main challenge in root phenotyping programs is the limited accessibility to the root system because it is...
Article
Full-text available
The remarkable complexity of soil and its importance to a wide range of ecosystem services presents 133 major challenges to the modeling of soil processes. Although major progress in soil models has 134 occurred in the last decades, models of soil processes remain disjointed between disciplines or 135 ecosystem services, with considerable uncertain...
Article
Full-text available
We reviewed soil modeling and the role of soil processes in quantifying ecosystem services. Key challenges were identified and the establishment of a soil modeling consortium to advance soil modeling activities, provide a data-model platform, perform model intercomparison and foster communication amongst Earth science disciplines is proposed.
Code
A dynamic 3D root architecture model written in C++.
Article
Full-text available
p>The remarkable complexity of soil and its importance to a wide range of ecosystem services presents major challenges to the modeling of soil processes. Although major progress in soil models has occurred in the last decades, models of soil processes remain disjointed between disciplines or ecosystem services, with considerable uncertainty remaini...
Article
Full-text available
Water stress is among the dominant yield limiting factors in global crop production. Better drought resistance is therefore a key challenge for breeding and crop management. Avoidance of water stress by effective root water uptake is considered a promising approach to yield stability in water limiting environments. Water uptake efficiency is the re...
Article
Full-text available
Aims: Roots are essential drivers of soil structure and pore formation. This study aimed at quantifying root induced changes of the pore size distribution (PSD). The focus was on the extent of clogging vs. formation of pores during active root growth. Methods: Parameters of Kosugi's lognormal PSD model were determined by inverse estimation in a...
Article
Full-text available
Aims: Small scale root-pore interactions require validation of their impact on effective hydraulic processes at the field scale. Our objective was to develop an interpretative framework linking root effects on macroscopic pore parameters with knowledge at the rhizosphere scale. Methods: A field experiment with twelve species from different famil...
Article
Full-text available
Plant root systems have a key role in ecology and agronomy. In spite of fast increase in root studies, still there is no classification that allows distinguishing among distinctive characteristics within the diversity of rooting strategies. Our hypothesis is that a multivariate approach for "plant functional type" identification in ecology can be a...
Article
Background Three–dimensional root architectural models emerged in the late 1980s, providing an opportunity to conceptualise and investigate that all important part of plants that is typically hidden and difficult to measure and study. These models have progressed from representing pre–defined root architectural arrangements, to simulating root grow...
Article
Full-text available
Root architecture is a key factor for plant acquisition of water and nutrients from soil. In particular in view of a second green revolution where the below ground parts of agricultural crops are important, it is essential to characterise and quantify root architecture and its effect on plant resource acquisition. Mathematical models can help to un...
Conference Paper
Full-text available
Understanding root-soil interactions is of high importance for environmental and agricultural management. Root uptake is an essential component in water and solute transport modeling. The amount of groundwater recharge and solute leaching significantly depends on the demand based plant extraction via its root system. Plant uptake however not only r...
Article
Full-text available
Mathematical modeling is an important tool in rhizosphere research. Considering that root system and rhizosphere traits govern plant resource efficiency, accurate modeling of nutrient uptake is an important challenge in the light of upcoming shortages of mineral fertilizers and climate change. We present a three-dimensional model for phosphate upta...
Article
Mathematical models are invaluable for the design of rhizotechnologies that help to improve nutrient and water efficiency. In our work, we present a mechanistic one dimensional model accounting for the complex plant-induced chemical processes in soil on single root scale. The equations are based on conservation of mass and the law of mass action an...
Article
The functional role of organic acid anions in soil has been intensively investigated, with special focus on (i) microbial respiration and soil carbon dynamics, (ii) nutrient solubilization or (iii) metal detoxification and reduction of plant metal uptake. Little is known about the interaction dynamics of organic acid anions with the soil matrix and...
Article
The functional role of organic acid anions in soil has been intensively investigated, with special focus on (i) microbial respiration and soil carbon dynamics, (ii) nutrient solubilization or (iii) metal detoxification and reduction of plant metal uptake. Little is known about the interaction dynamics of organic acid anions with the soil matrix and...
Article
Phosphorus is a major limiting factor in plant growth and crop production. Phosphorus solubilisation, uptake by plant roots and efflux lead to complex, dynamic cycling of P in the vicinity of plant roots. However, direct observation of P dynamics in the rhizosphere at relevant spatial scales (sub-mm) is still lacking. Chemical imaging of the dissol...
Chapter
Full-text available
The large number of models for P dynamics in soil–plant systems focus on different scales and have different purposes. This chapter provides an overview of existing models and illustrates the scope and potential of current modelling techniques by using three case studies. We focus on plant traits that enhance plant phosphate uptake from soil. The f...