Visualization of transport pathways for organic compounds in undisturbed soil monoliths

Kasteel, R.; Schnitzler, Frauke; Berns, Anne E.; Vanderborght, Jan; Vereecken, Harry

doi:10.1016/j.geoderma.2012.11.014

Cited by 8 publications

(7 citation statements)

References 39 publications

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“…The dye results are similar to those of Kasteel et al (2013) obtained on a Luvisol and a Cambisol. They showed that the first centimeters of their soil monoliths also acted as a redistribution volume for the underlying macropores.…”

Section: Discussionsupporting

confidence: 84%

“…Although dye tracing has been widely used at the profile or core scales to identify flow pathways and flow regimes in soils (Mooney and Morris, 2008; Kodesova et al, 2012; Kasteel et al, 2013), this technique is destructive and cannot trace the dynamics of water flow within a rainfall event. Nowadays, X‐CT is more extensively used as a nondestructive way to image the inner structure of soils, combining mineral composition, water content, and bulk density data (Mees, 2003; Kalender, 2005; Helliwell et al, 2013; Wildenschild and Sheppard, 2013).…”

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confidence: 99%

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Identifying the Functional Macropore Network Related to Preferential Flow in Structured Soils

Sammartino

Lissy

Bogner

et al. 2015

Vadose Zone Journal

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International audienceUnderstanding the processes and mechanisms that control preferential flow in soils in relation to the properties of their structures is still challenging since fast flow and transport occur in a small fraction of the porosity, that is, the functional macropore network, making it difficult to image and characterize these processes at decimeter scales. The aim of the paper was therefore to propose a new image acquisition and analysis methodology to characterize preferential flow at the core scale and identify the resulting active macropore network. Water infiltration was monitored by a sequence of three-dimensional images (taken at 5-, 10-, or 15-min intervals) with an X-ray scanner that allows very fast acquisitions (10 s for a 135-mm diameter). A simultaneous dye tracer experiment was also conducted. Water infiltration was then imaged at each acquisition time by the voxels impacted by water during infiltration, named the water voxels. The number of times a voxel was impacted by water during the experiment was converted into data reflecting the water detection frequency at the given position in the soil column, named the local detection frequency. Compared with dye staining, the active macropore network was defined by macropores in which water voxels were the most frequently detected during the experiment (local detection frequency above 65%). The geometric properties of this active network, such as the connectivity, were significantly different from those of the total structure. This image processing methodology coupled to dynamic acquisitions can be used to improve the analysis of preferential flow processes related to soil structures at the core scale

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Section: Discussionsupporting

confidence: 84%

mentioning

confidence: 99%

Identifying the Functional Macropore Network Related to Preferential Flow in Structured Soils

Sammartino

Lissy

Bogner

et al. 2015

Vadose Zone Journal

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“…Dye coverage: proportion of the dye-stained areas to sum of the dye-stained and non-stained areas (Kasteel et al, 2013) (equation (1)). In preferential pathways, water and solute flows through this way, bypassing the soil matrix.…”

Section: Preferential Flow Indicesmentioning

confidence: 99%

Effects of fine root length density and root biomass on soil preferential flow in forest ecosystems

et al. 2015

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Aim of study: The study was conducted to characterize the impacts of plant roots systems (e.g., root length density and root biomass) on soil preferential flow in forest ecosystems.Area of study: The study was carried out in Jiufeng National Forest Park, Beijing, China.Material and methods: The flow patterns were measured by field dye tracing experiments. Different species (Sophora japonica Linn, Platycladus orientalis Franco, Quercus dentata Thunb) were quantified in two replicates, and 12 soil depth were applied. Plant roots were sampled in the sieving methods. Root length density and root biomass were measured by WinRHIZO. Dye coverage was implied in the image analysis, and maximum depth of dye infiltration by direct measurement.Main results: Root length density and root biomass decreased with the increasing distance from soil surface, and root length density was 81.6% higher in preferential pathways than in soil matrix, and 66.7% for root biomass with respect to all experimental plots. Plant roots were densely distributed in the upper soil layers. Dye coverage was almost 100% in the upper 5-10 cm, but then decreased rapidly with soil depth. Root length density and root biomass were different from species: Platycladus orientalis Franco > Quercus dentata Thunb > Sophora japonica Linn.Research highlights: The results indicated that fine roots systems had strong effects on soil preferential flow, particularly root channels enhancing nutrition transport across soil profiles in forest dynamics.Key words: soil preferential flow; preferential pathways; soil matrix; root length density; root biomass.

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“…One of the key issues relies on the fact that although the properties of the OM are different from the bulk soil (Kasteel et al 2013), it is still difficult to differentiate between the features due to the similarity in attenuation between the different components of such soils (Quinton et al 2009). However, in recent years, some attempts have been reported in overcoming this limitation.…”

Section: Organic Matter Content Of the Soilmentioning

confidence: 99%

“…However, although this and other combined techniques seem reliable and robust, they are yet to be fully utilized to gain deeper understanding into the mechanism of OM decomposition and dynamics in undisturbed soil samples. Comparing data from the experiment using leacher with that provided by non-leacher staining agents on in situ soils, Kasteel et al (2013) found that the latter was more effective in establishing the relationship between the structure of the soil and roots distribution as key parameters for quantifying the OM composition of soil.…”

Section: Detection Of Organic Mattermentioning

confidence: 99%

Combining X-ray computed tomography with relevant techniques for analyzing soil–root dynamics – an overview

Mao

Kumi

et al. 2015

Acta Agriculturae Scandinavica, Section B — Soil & Plant Sc

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The study of below-ground features of roots and soil and their interactions is essential for understanding the configuration and diversities in such a dynamic environment. X-ray computed tomography is recognized as a tool for visualizing the physical interactions in the soil. In many studies, it has been used as a stand-alone tool to describe soil and root parameters. However, in recent times, attempts to couple it with other complementary tools are gaining rapid interest among researchers. The paper therefore provides an overview of the major application of combining X-ray computed tomography with other relevant methods in analyzing the structural characteristics of roots and soil media. The relevance of using this multidisciplinary approach for unraveling the mysteries surrounding root-soil dynamic interactions is stressed. The current and future trends of such studies are also pointed out.

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Visualization of transport pathways for organic compounds in undisturbed soil monoliths

Cited by 8 publications

References 39 publications

Identifying the Functional Macropore Network Related to Preferential Flow in Structured Soils

Identifying the Functional Macropore Network Related to Preferential Flow in Structured Soils

Effects of fine root length density and root biomass on soil preferential flow in forest ecosystems

Combining X-ray computed tomography with relevant techniques for analyzing soil–root dynamics – an overview

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