Plant age effects on soil infiltration rate during early plant establishment

Leung, Anthony Kwan; Boldrin, David; Liang, Teng; Wu, Zhe; Kamchoom, Viroon; Bengough, A. Glyn

doi:10.1680/jgeot.17.t.037

Cited by 42 publications

(83 citation statements)

References 22 publications

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“…The fractal dimension of soil particle size had a strong positive correlation with the initial infiltration rate (R 2 = 0.9037) and the stable infiltration rate (R 2 = 0.9229). Thus, based on regression analysis, the correlation with the steady infiltration rate was stronger than with the initial infiltration rate, which is due to the fractal dimension of PSD reflecting the spatial filling capacity of soil based on the distribution of soil particles [35]. In other words, the smaller the soil particle diameter (i.e., clay, silt, and organic matter), the greater the spatial filling capacity of the soil, which corresponds to higher fractal dimension values of PSD.…”

Section: Correlation Between Fractal Dimension and Soil Infiltration mentioning

confidence: 97%

Soil Particle-Size Distribution and Soil Infiltration Characteristics of Different Vegetation Communities in a Typical Mountainous Region of China

Ren

Xia

Zhang

et al. 2019

Pol. J. Environ. Stud.

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In order to explore the improving effect and mechanisms of vegetation communities on soil structure and infiltration processes, we used fractal scaling theory to analyse soil particle-size distribution (PSD), soil dimension and soil infiltration for seven vegetation communities in the Dabie mountainous region of central China. The results showed that coniferous and broad-leaved mixed forests (PQ) had a higher function of meliorating soil particle structure and infiltration capability than broad-leaved forests (PC and QA) and coniferous forests (PD). In general, the amounts of silt and clay increased under PQ, PC and QA vegetation communities, whereas fine sand content decreased, resulting in higher values for soil total porosity and capillary porosity. For shelter forests, the infiltration rate was higher than other vegetation communities. The overall fractal dimensions of PSD ranged from 2.071 to 2.430, and the fractal dimensions of PQ, PC, QA and PD in shelter forests were far higher (mean value of 2.312) than those of the others. There was significant positive correlation between the fractal dimension and the amount of silt and clay (R = 0.815), and negative correlation with fine sand (R =-0.549). There was also a strong linear positive relationship between the fractal dimension and the soil's infiltration rate. Correlations of the fractal dimension with the soil infiltration capability provided strong evidence that vegetation communities enhanced the soil fractal dimension by increasing the amounts of silt and clay, thereby improving both aggregate structure and pore structure and enhancing the degree of soil texture

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Section: Correlation Between Fractal Dimension and Soil Infiltration mentioning

confidence: 97%

Soil Particle-Size Distribution and Soil Infiltration Characteristics of Different Vegetation Communities in a Typical Mountainous Region of China

Ren

Xia

Zhang

et al. 2019

Pol. J. Environ. Stud.

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“…Note that (n -ua) and (ua -uw) is referred to as net normal stress and matric suction (s), respectively. When plant roots exist, the shear strength equation may be modified by adding a term so-called "root cohesion" (cr) in Eq (6), to account for the effect of mechanical root reinforcement: = • • (7) where kr is an empirical root-soil interaction factor that depends on root orientation and root breakage process, taken to be 0.318 for U. europaeus ; Ar is root-area ratio (RAR; ratio between cross-section area of roots crossing a shear plane and total area of the shear plane). Since the root tensile strength (defined by the final root diameter after dehydration) is a function of root water content (Fig.…”

Section: Shear Strength Equationsmentioning

confidence: 99%

“…The new diameter is also used to update the Ar in Eq. (7). Eventually, the shear strength of unsaturated soil due to the simultaneous changes of cr and Se can be estimated, via Eq.…”

Section: Soil-root Moisture Exchangementioning

confidence: 99%

Role of hydromechanical properties of plant roots in unsaturated soil shear strength

Leung

Boldrin

Karimzadeh

et al. 2019

JGS Special Publication

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Plants increase slope stability through mechanical reinforcement by roots and transpiration-induced matric suction (hence increase in soil shear strength; known as hydrological reinforcement). The effects of root water status on root biomechanical properties (e.g. volume change and tensile properties), and eventually the shear strength of rooted soil, have not yet been fully investigated. This paper studies the hydromechanical properties of plant roots and estimates how these properties may affect unsaturated soil strength. The root water retention curve (RWRC), is introduced as a new concept to relate root water content and root suction. Unsaturated shear strength equations are hypothesised to utilise RWRC to couple the mechanical and hydrological reinforcement by plant roots. The potential importance of considering the effects of root hydromechanical properties on soil shear strength is highlighted, together with the need to fully test and develop the underlying models.

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“…Some studies (Table 1) showed an increase in water retention capability when plant roots are present in the soil (Scanlan & Hinz, 2010;Rahardjo et al, 2014;Leung et al, 2015;Ng et al, 2016a, b;Jotisankasa & Siririrattanachat, 2017), probably because of the blockage of soil pore space by roots (Buczko et al, 2007). However, some studies reported an opposite result Jotisankasa and Sirirattanachat, 2017), arguably because of the formation of soil cracks due to, for instances, repeated soil shrinkage, swelling and root decay and growth (Vergani & Graf, 2015;Ng et al, 2016a;Ni et al, 2017;Leung et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Unsaturated hydraulic properties of vegetated soil under single and mixed planting conditions

Leung

2019

Géotechnique

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Unsaturated hydraulic properties of vegetated soil under single and mixed planting conditions Ni, J. J .; Leung, Anthony; Ng, C. W. W. Published in: Géotechnique DOI:10.1680/jgeot.17.t.044 Publication date: 2018 Document Version Peer reviewed version Link to publication in Discovery Research Portal Citation for published version (APA):Ni, J. J. ., Leung, A., & Ng, C. W. W. (2018). Unsaturated hydraulic properties of vegetated soil under single and mixed planting conditions. Géotechnique. https://doi.org/10.1680/jgeot.17.t.044 General rightsCopyright and moral rights for the publications made accessible in Discovery Research Portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from Discovery Research Portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain.• You may freely distribute the URL identifying the publication in the public portal. Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Accepted manuscript doi:10.1680/jgeot.17.t.044 Accepted manuscriptAs a service to our authors and readers, we are putting peer-reviewed accepted manuscripts (AM) online, in the Ahead of Print section of each journal web page, shortly after acceptance. DisclaimerThe AM is yet to be copyedited and formatted in journal house style but can still be read and referenced by quoting its unique reference number, the digital object identifier (DOI). Once the AM has been typeset, an 'uncorrected proof' PDF will replace the 'accepted manuscript' PDF. These formatted articles may still be corrected by the authors. During the Production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal relate to these versions also. Version of recordThe final edited article will be published in PDF and HTML and will contain all author corrections and is considered the version of record. Authors wishing to reference an article published Ahead of Print should quote its DOI. When an issue becomes available, queuing Ahead of Print articles will move to that issue's AbstractEffects of plant roots on changes of soil hydraulic properties, including soil water retention curves (SWRC) and soil hydraulic conductivity functions (SHCF), are not well understood, especially when soil is unsaturated and vegetated with multiple plant species. This note aims to quantify the root effects on both SWRC and SHCF of silty sand using the instantaneous profile method. Four types of vegetated soil, namely bare, grass-only, tree-only and mixed tree-grass soils, were subjected to a controlled drying-wetting cycle in a plant room. Plant roots affect the air-entry value, saturated hydrau...

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Plant age effects on soil infiltration rate during early plant establishment

Cited by 42 publications

References 22 publications

Soil Particle-Size Distribution and Soil Infiltration Characteristics of Different Vegetation Communities in a Typical Mountainous Region of China

Soil Particle-Size Distribution and Soil Infiltration Characteristics of Different Vegetation Communities in a Typical Mountainous Region of China

Role of hydromechanical properties of plant roots in unsaturated soil shear strength

Unsaturated hydraulic properties of vegetated soil under single and mixed planting conditions

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