Tortuosidade e conectividade da rede trabecular do rádio distal a partir de imagens microtomográficas

doi:10.4322/rbeb.2012.017

Cited by 4 publications

(4 citation statements)

References 20 publications

(25 reference statements)

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“…The linear correlation for the set of EPC values with respect to the contiguous image sections, known as disectors (Sterio, 1984), was obtained considering 549 disectors. Once estimated the EPC for each disector of a sample, the sum of EPC values gives an estimate of the connection of the sample; however, it is more convenient to obtain the EPC per sample volume (Roque et al, 2012b). According to the EPC, highly connected structures present small and negative values (Chappard et al, 1999) while low connected structures present high positive values (Roque et al, 2009).…”

Section: Micromorphological Analysis (Mct)mentioning

confidence: 99%

Soil structure changes induced by tillage systems

Pires

Borges

Rosa³

et al. 2017

Soil and Tillage Research

200

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Structure represents one of the main soil physical attributes indicators. The soil porous system (SPS) is directly linked to the soil structure. Water retention, movement, root development, gas diffusion and the conditions for all soil biota are related to the SPS. Studies about the influence of tillage systems in the soil structure are important to evaluate their impact in the soil quality. This paper deals with a detailed analysis of changes in the soil structure induced by conventional (CT) and no-tillage (NT) systems. Three different soil depths were studied (0-10, 10-20 and 20-30 cm). Data of the soil water retention curve (SWRC), micromorphologic (impregnated blocks) (2D) and microtomographic (mCT) (3D) analyses were utilized to characterize the SPS. Such analyses enabled the investigation of porous system attributes such as: porosity, pore number and shape, pore size distribution, tortuosity and connectivity. Results from this study show a tri-modal pore size distribution (PSD) at depths 0-10 and 10-20 cm for the soil under CT and a bi-modal PSD for the lower layer (20-30 cm). Regarding the soil under NT, tri-modal PSDs were found at the three depths analyzed. Results based on the micromorphologic analysis (2D) showed that the greatest contribution to areal porosity (AP) is given by pores of round (R) shape for CT (52%: 0-10 cm; 50%: 10-20 cm; 67%: 20-30 cm). Contrary to the results observed for CT, the soil under NT system gave the greatest contribution to AP, for the upper (0-10 cm) and intermediate (10-20 cm) layers, due to the large complex (C) pore types. For the mCT analysis, several types of pores were identified for each soil tillage system. Small differences in the macroporosity (MAP) were observed for the 0-10 and 20-30 cm between CT and NT. A better pore connectivity was found for the 0-10 cm layer under NT. 2016 Elsevier B.V. All rights reserved.

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Section: Micromorphological Analysis (Mct)mentioning

confidence: 99%

Soil structure changes induced by tillage systems

Pires

Borges

Rosa³

et al. 2017

Soil and Tillage Research

200

View full text Add to dashboard Cite

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“…The pore connectivity (C) (Equation (8)) was obtained through the Euler characteristic (EC) (Equation (9)) [ 30 , 46 , 47 ]. The BoneJ plugin for ImageJ-Fiji software (1.52) was utilized to estimate the degree of connectivity of the soil pore system as follows:

where n v is the number of disconnected parts of the porous space per volume and C v is the connectivity by volume (430 × 430 × 860 voxels).…”

Section: Methodsmentioning

confidence: 99%

“…The pore tortuosity (τ) (Equation (10)) was calculated by the ratio between the geodesic distance (L G ) between two connected points in the pore network and the Euclidean distance (L E ) between them [ 29 ]. The OsteoImage software was utilized for this calculation [ 46 , 47 ].

…”

Section: Methodsmentioning

confidence: 99%

Soil Pore Network Complexity Changes Induced by Wetting and Drying Cycles—A Study Using X-ray Microtomography and 3D Multifractal Analyses

Oliveira

Cássaro

Posadas³

et al. 2022

IJERPH

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Soils are dynamic and complex systems in their natural state, which are subjected to profound changes due to management. Additionally, agricultural soils are continuously exposed to wetting and drying (W-D) cycles, which can cause modifications in the complexity of their pores. Thus, we explore how successive W-D cycles can affect the pore network of an Oxisol under contrasting managements (conventional tillage—CT, minimum tillage—MT, no tillage—NT, and secondary forest—F). The complexity of the soil pore architecture was evaluated using a 3D multifractal approach combined with lacunarity, Shannon’s entropy, and pore geometric parameters. Our results showed that the multifractal approach effectively identified and quantified the changes produced in the soil pore architecture by the W-D cycles. The lacunarity curves revealed important aspects of the modifications generated by these cycles. Samples under F, NT, and MT suffered the most significant changes. Pore connectivity and tortuosity were largely affected by the cycles in F and NT. Our findings demonstrated that the 3D geometric parameters and normalized Shannon’s entropy are complementary types of analysis. According to the adopted management, they allowed us to separate the soil into two groups according to their similarities (F and NT; CT and MT).

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“…The network tortuosity (τ) of the pores and connectivity was calculated using Osteoimage 37,38 . Tortuosity was determined through the geodesic reconstruction algorithm implemented by Roque et al 39,40 . Geometrically, tortuosity is defined as (Eq.…”

Section: X-ray Computed Tomography (Ct)mentioning

confidence: 99%

Brachiaria species influence nitrate transport in soil by modifying soil structure with their root system

Galdos

Brown

Rosolem

et al. 2020

Sci Rep

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Leaching of nitrate from fertilisers diminishes nitrogen use efficiency (the portion of nitrogen used by a plant) and is a major source of agricultural pollution. To improve nitrogen capture, grasses such as brachiaria are increasingly used, especially in South America and Africa, as a cover crop, either via intercropping or in rotation. However, the complex interactions between soil structure, nitrogen and the root systems of maize and different species of forage grasses remain poorly understood. This study explored how soil structure modification by the roots of maize (Zea maize), palisade grass (Brachiaria brizantha cv. Marandu) and ruzigrass (Brachiaria ruziziensis) affected nitrate leaching and retention, measured via chemical breakthrough curves. All plants were found to increase the rate of nitrate transport suggesting root systems increase the tendency for preferential flow. The greater density of fine roots produced by palisade grass, subtly decreased nitrate leaching potential through increased complexity of the soil pore network assessed with X-ray Computed Tomography. A dominance of larger roots in ruzigrass and maize increased nitrate loss through enhanced solute flow bypassing the soil matrix. These results suggest palisade grass could be a more efficient nitrate catch crop than ruzigrass (the most extensively used currently in countries such as Brazil) due to retardation in solute flow associated with the fine root system and the complex pore network.

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Tortuosidade e conectividade da rede trabecular do rádio distal a partir de imagens microtomográficas

Cited by 4 publications

References 20 publications

Soil structure changes induced by tillage systems

Soil structure changes induced by tillage systems

Soil Pore Network Complexity Changes Induced by Wetting and Drying Cycles—A Study Using X-ray Microtomography and 3D Multifractal Analyses

Brachiaria species influence nitrate transport in soil by modifying soil structure with their root system

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