Micro-scale dry bulk density variation around earthworm (Lumbricus terrestris L.) burrows based on X-ray computed tomography

Rogasik, Helmut; Schrader, Stefan; Onasch, Ingrid; Kiesel, Joachim; Gerke, Horst H.

doi:10.1016/j.geoderma.2013.08.034

Cited by 55 publications

(36 citation statements)

References 31 publications

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“…This is caused by but the lack of information about small scaled differences in clay content and total or airfilled porosity which were assumed to be homogeneous within a single sample. Small scaled differences in pore volumes or textural differences can be determined with the help of micro Xray computed tomography (Peth et al, 2010;Rogasik et al, 2014) or infrared spectroscopy (Leue et al, 2010;Stenberg et al, 2010), respectively.…”

Section: R Ew Rewmentioning

confidence: 99%

Impact of Small-Scaled Differences in Micro-Aggregation on Physico-Chemical Parameters of Macroscopic Biopore Walls

Haas

Horn

2018

Front. Environ. Sci.

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Macroscopic biopores, like earthworm burrows or channels which remain after a root decayed, act as preferential flow paths for water, gas, and heat transport processes, and viewing at agricultural production, as preferential elongation paths for plant roots. These processes result in intense alterations of the soil volume and its composition that surrounds the pores. The effects of these processes were analyzed at small-scale and physico-chemical soil parameters, i.e., relative oxygen diffusion coefficient (D s /D O ), oxygen partial pressure pO 2 , Eh and pH of biopore walls, were measured. The analyses were carried out on undisturbed soil samples with different colonization history, excavated from a haplic Luvisol derived from loess. Soil resistance to penetration was determined simultaneously with D s /D O and pO 2 using a coupled, self-developed approach, and four matric potentials (namely, m = −1 kPa; −3 kPa; −6 kPa or −30 kPa) were considered. We hypothesized that physico-chemical soil parameters in biopore walls were altered due to differing influences on the soil aggregation. Aggregation was visualized with scanning electron microscopy, classified and used to explain differences in-soil properties. Plant roots and earthworms altered aggregation next to biopore surfaces in a contrasted way, either by enhancing aggregates diversity or homogenizing it. Roots led to the formation of subpolyeders while earthworms formed subplates. Pore functions of microaggregates were comparable to those of larger scale, and subpolyeders showed much more favorable soil properties in terms of soil aeration (Ds/Do, pO2). Replicates of all parameters scattered intensely and showed deviations up to several orders of magnitude in case of D s /D O underlining the large variability of soil properties in biopore walls.

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Section: R Ew Rewmentioning

confidence: 99%

Impact of Small-Scaled Differences in Micro-Aggregation on Physico-Chemical Parameters of Macroscopic Biopore Walls

Haas

Horn

2018

Front. Environ. Sci.

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“…Aggregate coatings and biopore walls are characteristic soil structural features (e.g., Gerke and Köhne, 2002;Kodešová, 2009;Kodešová et al, 2011Kodešová et al, , 2015Rogasik et al, 2014) that are of great importance when attempting to describe preferential flow and transport processes in soils (e.g., Gerke, 2012;Kodešová, 2009;Kodešová et al, 2008Kodešová et al, , 2009Kodešová et al, , 2010Kodešová et al, , 2012. Clay-organic coatings often cover aggregates and biopores in the clay-illuviation Bt-horizons of Luvisols (IUSS Working Group WRB, 2014).…”

Section: Introductionmentioning

confidence: 99%

Droplet infiltration dynamics and soil wettability related to soil organic matter of soil aggregate coatings and interiors

Fér

Leue

Kodešová

et al. 2016

Journal of Hydrology and Hydromechanics

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Abstract:The organo-mineral coatings of soil aggregates, cracks, and biopores control sorption and macropore-matrix exchange during preferential flow, in particular in the clay-illuvial Bt-horizon of Luvisols. The soil organic matter (SOM) composition has been hypothesized to explain temporal changes in the hydraulic properties of aggregate surfaces. The objective of this research was to find relations between the temporal change in wettability, in terms of droplet infiltration dynamics, and the SOM composition of coated and uncoated aggregate surfaces. We used 20 to 40 mm sized soil aggregates from the Bt2 horizon of a Haplic Luvisol from loess that were (i) coated, (ii) not coated (both intact), and (iii) aggregates from which coatings were removed (cut). The SOM composition of the aggregate surfaces was characterized by infrared spectroscopy in the diffuse reflection mode (DRIFT). A potential wettability index (PWI) was calculated from the ratio of hydrophobic and hydrophilic functional groups in SOM. The water drop penetration times (WDPT) and contact angles (CA) during droplet infiltration experiments were determined on dry and moist aggregate samples of the three types. The decrease in the CA with time was described using the power function (CA(t) = at -b ). For dry aggregates, the WDPT values were larger for coated as compared to uncoated regions on the aggregate surfaces, and increased with increasing PWI value (R 2 = 0.75). The a parameter was significantly related to the WDPT (R 2 = 0.84) and to the PWI (R 2 = 0.64). The relations between the b parameter and the WDPT (R 2 = 0.61) and the PWI (R 2 = 0.53) were also significant. The WDPT values of wet soil aggregates were higher than those of dry aggregates due to high water contents, which limited the droplet infiltration potential. At the wet aggregate surfaces, the WDPT values increased with the PWI of the SOM (R 2 = 0.64). In contrast to dry samples, no significant relationships were found between parameters a or b of CA(t) and WDPT or PWI for wet aggregate surfaces. The results suggest that the effect of the SOM composition of coatings on surface wettability decreases with increasing soil moisture. In addition to the dominant impact of SOM, the wettability of aggregate surfaces could be affected by different mineralogical compositions of clay in coatings and interiors of aggregates. Particularly, wettability of coatings could be decreased by illite which was the dominant clay type in coatings. However, the influence of different clay mineral fractions on surface wettability was not due to small number of measurements (2 and 1 samples from coatings and interiors, respectively) quantified.

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“…The method developed by Capowiez et al (2014) involved tracing burrowing patterns onto a transparent sheet of plastic wrapped around the outer surface of a repacked soil core. To our knowledge, despite recent attempts in this direction (Capowiez et al 2011;Rogasik et al 2014), there has been no clear illustration and quantification of earthworm burrow refilling within undisturbed soil cores using CT scanning data. Therefore, the purpose of our study was: (1) to make such a demonstration, by working at a fine resolution voxel size (0.3 ) 0.3 )0.3 mm in 3D), (2) to analyze areas and volumes obtained from CT images constructed by helical scanning, and (3) to collect sufficient data on burrow refilling by endogeic and anecic earthworms to perform statistical analyses and obtain significant results.…”

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confidence: 99%

Burrow refilling behavior ofAporrectodea turgida(Eisen) andLumbricus terrestrisL. as revealed by X-ray computed tomography scanning: Graphical and quantitative analyses

2015

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P. 2015. Burrow refilling behavior of Aporrectodea turgida (Eisen) and Lumbricus terrestris L. as revealed by X-ray computed tomography scanning: Graphical and quantitative analyses. Can. J. Soil Sci. 95: 231Á235. Solute and gas transport through earthworm burrows is altered when burrows become refilled. Earthworm burrow refilling was evaluated with non-invasive X-ray computed tomography in undisturbed soil cores. Proportionally, Lumbricus terrestris refilled burrows had more air-filled space left around their perimeter than those of Aporrectodea turgida, which often were completely refilled.Key words: Burrowing behavior, computed tomography (CT) scanning, earthworms, soil macroporosity Whalen, J. K., Han L. et Dutilleul, P. 2015. Le remplissage des sillons par Aporrectodea turgida (Eisen) et Lumbricus terrestris L. re´ve´le´graˆce a`la tomographie assiste´e par ordinateur aux rayons X: analyses graphiques et quantitatives. Can. J. Soil Sci. 95: 231Á235. Le transport des solute´s et des gaz dans les trous de ver de terre se modifie lors du remplissage des sillons. Les auteurs ont e´value´le remplissage des trous de ver de terre graˆce a`la technique non invasive de tomographie aux rayons X assiste´e par ordinateur dans des carottes de sol non perturbe´. Toutes proportions garde´es, apre`s remplissage, les trous de Lumbricus terrestris contiennent plus d'air en pe´riphe´rie que ceux d'Aporrectodea turgida, qui sont souvent totalement remplis. Mots clé s:Remplissage des sillons, tomographie assiste´e par ordinateur, vers de terre, macroporosite´du sol

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Micro-scale dry bulk density variation around earthworm (Lumbricus terrestris L.) burrows based on X-ray computed tomography

Cited by 55 publications

References 31 publications

Impact of Small-Scaled Differences in Micro-Aggregation on Physico-Chemical Parameters of Macroscopic Biopore Walls

Impact of Small-Scaled Differences in Micro-Aggregation on Physico-Chemical Parameters of Macroscopic Biopore Walls

Droplet infiltration dynamics and soil wettability related to soil organic matter of soil aggregate coatings and interiors

Burrow refilling behavior ofAporrectodea turgida(Eisen) andLumbricus terrestrisL. as revealed by X-ray computed tomography scanning: Graphical and quantitative analyses

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