Impact of potential bio-subsoilers on pore network of a severely compacted subsoil

Pulido-Moncada, Mansonia; Katuwal, Sheela; Ren, Lidong; Cornelis, Wim; Munkholm, Lars J.

doi:10.1016/j.geoderma.2019.114154

Cited by 27 publications

(14 citation statements)

References 51 publications

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“…X‐ray computed microtomography (μCT) combines the penetrating capacity of X‐rays with 3D volume reconstruction to observe the internal 3D structure of objects in a non‐destructive manner (Cnudde & Boone, 2013). μCT has been applied extensively to agricultural soils to investigate the impact of subsurface structures on crucial soil functions such as water infiltration (Jarvis et al, 2017; Katuwal et al, 2015; Müller et al, 2018; Pot et al, 2020; Tracy et al, 2015), root–pore interactions and patterns of plant growth (Hu et al, 2020; Lucas et al, 2019; Pulido‐Moncada et al, 2020). In recent years, the technique has been extended to saltmarsh substrates (Dale et al, 2019; Spencer et al, 2017; Van Putte et al, 2019); however, distinguishing roots from pores is challenging because their greyscale values overlap due to the partial volume effect (Cnudde & Boone, 2013; Helliwell et al, 2013), especially in these complex heterogeneous substrates.…”

Section: Introductionmentioning

confidence: 99%

Effect of vegetation cover and sediment type on 3D subsurface structure and shear strength in saltmarshes

Chirol

Spencer

Carr

et al. 2021

Earth Surf Processes Landf

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The vulnerability of saltmarshes to lateral erosion at their margin depends on the local biogeomorphological properties of the substrate. In particular, the 3D architecture of pore and root systems is expected to influence shear strength, with repercussions for the wider-scale stability of saltmarshes. We apply X-ray computed microtomography (μCT) to visualize and quantify subsurface structures in two UK saltmarshes at Tillingham Farm, Essex (silt/clay rich substrate) and Warton Sands (sand-rich substrate), with four types of ground cover: bare ground, Spartina spp, Salicornia spp and Puccinellia spp. We extracted μCT structural parameters that characterize pore and root morphologies at each station, and compared them with field measurements of shear strength using a principal component analysis and correlation tests. The 3D volumes show that species-dependent variations in root structures, plant colonization events and bioturbation activity control the morphology of macropores, while sediment cohesivity determines the structural stability and persistence of these pore structures over time, even after the vegetation has died. Areas of high porosity and high mean pore thickness were correlated to lower values of shear strength, especially at Tillingham Farm, where wellconnected vertical systems of macropores were associated with current or previous colonization by Spartina spp. However, while well-connected systems of macropores may lower the local deformation threshold of the sediment, they also encourage drainage, promote vegetation growth and reduce the marsh vulnerability to hydrodynamic forces. The highest values of shear strength at both sites were found under Puccinellia spp, and were associated with a high density of mesh-like root structures that bind the sediment and resist deformation. Future studies of marsh stability should ideally consider time series of vegetation cover, especially in silt/clay-dominated saltmarshes, in order to consider the potential effect of preserved buried networks of macropores on water circulation, marsh functioning and cliff-face erosion.

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Section: Introductionmentioning

confidence: 99%

Effect of vegetation cover and sediment type on 3D subsurface structure and shear strength in saltmarshes

Chirol

Spencer

Carr

et al. 2021

Earth Surf Processes Landf

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“…Our previous study in intact soil columns also demonstrated that fodder radish did not positively impact the pore network of the compacted subsoil in Aarslev; however, other species such as lucerne and chicory ( Cichorium intybus L.) showed greater potential as biosubsoilers by creating a larger, more connected, and complex pore network in the compacted layer (Pulido‐Moncada, Katuwal, Ren, Cornelis, & Munkholm, 2020a). Further studies involving different species with the potential to penetrate hard layers could provide better quantification of CC‐induced changes in the anisotropy of soil physical parameters in compacted subsoils.…”

Section: Resultsmentioning

confidence: 86%

Anisotropy of subsoil pore characteristics and hydraulic conductivity as affected by compaction and cover crop treatments

Pulido-Moncada

Labouriau

Kesser

et al. 2021

Soil Science Soc of Amer J

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The natural and cover crop (CC)‐induced anisotropy of subsoil pore characteristics is important in assessments of soil compaction but, until recently, has received limited attention. This study aims to quantify the anisotropy of soil pore characteristics and hydraulic conductivity in subsoils subjected to compaction and CC treatments in a split‐plot field experiment on temperate sandy loam soils. The main factor was ±compaction and the split‐plot factor was ±CC with fodder radish (Raphanus sativus L.). The compacted plots were heavily trafficked for 4 yr (2010–2013). After 4 yr under CC (2013–2016), core samples were collected at 0.3 m. The samples were taken vertically and horizontally to quantify the anisotropy of air‐filled porosity (εa) and air permeability (ka), saturated hydraulic conductivity (ksat), and bulk density (ρb). The results showed isotropic behavior for ρb and εa and significant anisotropic behavior (p < .05) for ka, pore geometry index (PO1) (ka/εa), ratio of non‐Darcian to Darcian ka (R‐ratio), and ksat. For parameters with significant anisotropy, higher values occurred vertically than horizontally for all compaction –CC combinations, except for R‐ratio. This indicates that pre‐existing vertical continuous pores dominated the pore system in the control subsoil. A nonsignificant trend of higher values of ka, PO1, and ksat in the +CC than in the compacted –CC plots suggest that CC could contribute to the formation of vertical biopores. Including an autumn CC in rotation with a summer cereal crop for a longer period may significantly affect the anisotropy of the soil pore and hydraulic properties.

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“…An alternative to limit deleterious effects and maintain the favorable structural change obtained with deep soil management practices is to associate these with cover crops. Cover crops induce changes in pore connectivity (Pulido-Moncada et al, 2020), which is specifically reported by Galdos et al (2020) for Brachiaria sp., that enhance hydraulic conductivity and water availability in the root-soil interface (Carminati et al, 2016) In fact,. Brachiaria in maize inter-row contributed for increasing saturated hydraulic conductivity by up to five times the values observed in uncultivated maize inter-rows (Scarabeli et al, 2018).…”

Section: Introductionmentioning

confidence: 77%

Changes in soil profile hydraulic properties and porosity as affected by deep tillage soil preparation and Brachiaria grass intercropping in a recent coffee plantation on a naturally dense Inceptisol

Silva

Severiano

Oliveira

et al. 2021

Soil and Tillage Research

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Impact of potential bio-subsoilers on pore network of a severely compacted subsoil

Cited by 27 publications

References 51 publications

Effect of vegetation cover and sediment type on 3D subsurface structure and shear strength in saltmarshes

Effect of vegetation cover and sediment type on 3D subsurface structure and shear strength in saltmarshes

Anisotropy of subsoil pore characteristics and hydraulic conductivity as affected by compaction and cover crop treatments

Changes in soil profile hydraulic properties and porosity as affected by deep tillage soil preparation and Brachiaria grass intercropping in a recent coffee plantation on a naturally dense Inceptisol

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