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

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Anisotropy of subsoil pore characteristics and hydraulic conductivity as affected by compaction and cover crop treatments. / Pulido-Moncada, Mansonia; Labouriau, Rodrigo; Kesser, Merek Marie; Zanini, Pedro Paulo Gonçalves; M.L. Guimarães, Rachel ; Munkholm, Lars Juhl.

In: Soil Science Society of America Journal, Vol. 85, No. 1, 01.01.2021, p. 28-39.

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Pulido-Moncada, Mansonia ; Labouriau, Rodrigo ; Kesser, Merek Marie ; Zanini, Pedro Paulo Gonçalves ; M.L. Guimarães, Rachel ; Munkholm, Lars Juhl. / Anisotropy of subsoil pore characteristics and hydraulic conductivity as affected by compaction and cover crop treatments. In: Soil Science Society of America Journal. 2021 ; Vol. 85, No. 1. pp. 28-39.

Bibtex

@article{417845e600124f83a72fc06081ed0829,
title = "Anisotropy of subsoil pore characteristics and hydraulic conductivity as affected by compaction and cover crop treatments",
abstract = "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 (ε a) and air permeability (k a), saturated hydraulic conductivity (k sat), and bulk density (ρ b). The results showed isotropic behavior for ρ b and ε a and significant anisotropic behavior (p <.05) for k a, pore geometry index (PO1) (k a/ε a), ratio of non-Darcian to Darcian k a (R-ratio), and k sat. 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 k a, PO1, and k sat 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. ",
author = "Mansonia Pulido-Moncada and Rodrigo Labouriau and Kesser, {Merek Marie} and Zanini, {Pedro Paulo Gon{\c c}alves} and {M.L. Guimar{\~a}es}, Rachel and Munkholm, {Lars Juhl}",
year = "2021",
month = jan,
day = "1",
doi = "10.1002/saj2.20134",
language = "English",
volume = "85",
pages = "28--39",
journal = "Soil Science Society of America Journal",
issn = "0361-5995",
publisher = "Soil Science Society of America",
number = "1",

}

RIS

TY - JOUR

T1 - Anisotropy of subsoil pore characteristics and hydraulic conductivity as affected by compaction and cover crop treatments

AU - Pulido-Moncada, Mansonia

AU - Labouriau, Rodrigo

AU - Kesser, Merek Marie

AU - Zanini, Pedro Paulo Gonçalves

AU - M.L. Guimarães, Rachel

AU - Munkholm, Lars Juhl

PY - 2021/1/1

Y1 - 2021/1/1

N2 - 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 (ε a) and air permeability (k a), saturated hydraulic conductivity (k sat), and bulk density (ρ b). The results showed isotropic behavior for ρ b and ε a and significant anisotropic behavior (p <.05) for k a, pore geometry index (PO1) (k a/ε a), ratio of non-Darcian to Darcian k a (R-ratio), and k sat. 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 k a, PO1, and k sat 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.

AB - 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 (ε a) and air permeability (k a), saturated hydraulic conductivity (k sat), and bulk density (ρ b). The results showed isotropic behavior for ρ b and ε a and significant anisotropic behavior (p <.05) for k a, pore geometry index (PO1) (k a/ε a), ratio of non-Darcian to Darcian k a (R-ratio), and k sat. 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 k a, PO1, and k sat 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.

U2 - 10.1002/saj2.20134

DO - 10.1002/saj2.20134

M3 - Journal article

VL - 85

SP - 28

EP - 39

JO - Soil Science Society of America Journal

JF - Soil Science Society of America Journal

SN - 0361-5995

IS - 1

ER -