Root induced changes of effective 1D hydraulic properties in a soil column

Scholl, P.; Leitner, Daniel; Kammerer, Gerhard; Loiskandl, Willibald; Kaul, Hans‐Peter; Bodner, Gernot

doi:10.1007/s11104-014-2121-x

Cited by 108 publications

(70 citation statements)

References 90 publications

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“…Bodner et al (2014) showed that coarser root systems would more prominently increase macro-porosity, while species with dense, finer root systems, such as grass, increase the heterogeneity of soil pore space and increase micro-pore volume. Indeed, very fine roots could permeate and so decrease large micro-pore and fine macro-pore (2·5-500 μm) volume (Scholl et al, 2014). In the present authors' experiments, the very small grass roots may therefore have blocked soil pores and slowed infiltration, whereas larger grass and willow roots may have generated preferential pathways in the soil for water flow.…”

Section: Resultsmentioning

confidence: 48%

“…It is one of the most important soil parameters that affects prediction of slope failure mechanism, especially when soil-plant interaction in shallow soil is taken into account (Nyambayo & Potts, 2010;Sidle & Bogaard, 2016;Tsiampousi et al, 2017). Plant roots permeated into the soil matrix could modify the soil structure (Scholl et al, 2014;Ng et al, 2016) and hence affect the infiltration rate due to root growth and penetration (Ghestem et al, 2011). Effects of roots on soil infiltrability have often shown contrasting results.…”

Section: Introductionmentioning

confidence: 99%

“…Effects of roots on soil infiltrability have often shown contrasting results. Studies that focus on relatively young plants found slowing of infiltration (Gish & Jury, 1983;Leung et al, 2015;Jotisankasa & Sirirattanachat, 2017) presumably due to root occupancy of soil pore space, which blocks water flow paths (Scholl et al, 2014;Ng et al, 2016). In contrast, increased infiltration rate is more often reported in mature plants (van Noordwijk et al, 1991;Mitchell et al, 1995;Ng et al, 2017), and is attributable to the formation of (a) root channel related macropores associated with root decay (Ghestem et al, 2011) or (b) desiccation cracks upon drying of medium-to high-plasticity clay (Zhan et al, 2007;Jotisankasa & Sirirattanachat, 2017;Song et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Plant age effects on soil infiltration rate during early plant establishment

et al. 2017

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Infiltration rate affects slope stability by determining the rate of water transport to potential failure planes. This note considers the influences of vegetation (grass and willow) establishment and root growth dynamics on infiltration rate, as related to establishing vegetation on bioengineered slopes. Soil columns of silty sand with and without vegetation were tested by constant-head infiltration tests at 2, 4, 6 and 8 weeks after planting. Infiltration rate increased linearly with plant age and below-ground traits including root biomass and root length density. Infiltration rate for willow-rooted soil was an order of magnitude higher than for fallow soil. The plant age effect was more prominent for willow, which grew faster and with thicker roots than the grass. Illustrative seepage analysis suggests that ignoring the plant age effects could underestimate wetting front advancement to greater depths during rainfall, and underestimate suction recovery at shallow depths during internal drainage.

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Section: Resultsmentioning

confidence: 48%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Plant age effects on soil infiltration rate during early plant establishment

et al. 2017

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“…Comparison of the results in Tables 4 and 5 reveals that for a given vegetated condition, the fitted parameters for SWRC are not always the same as those for SHCF. This implies that the presence of plant roots changed the soil pore size and its distribution, which are the fundamental properties that govern soil water retention and hydraulic conductivity (Scholl et al, 2014;Ng et al, 2016b). Indeed, most existing predictive equations of SHCF, including that suggested by van Genuchten (1980;Eqs (1) and (2) …”

Section: Unsaturated Soil Hydraulic Conductivitymentioning

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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“…Extensive field and laboratory studies have shown that transpiration-induced suction could be maintained in the soil during and after rainfall Ng et al 2014;Rahardjo et al 2014;Leung et al 2015a;Ng et al in press). Recent research also argues that the presence of roots could affect the soil water retention properties and hence the suction responses (Bengough 2012;Carminati and Vetterlein 2013;Scholl et al 2014;Leung et al 2015b;Ng et al 2016aNg et al , 2016b. The ability of plants to preserve/maintain suction has important implications for slope stability.…”

Section: Introductionmentioning

confidence: 99%

Correlating hydrologic reinforcement of vegetated soil with plant traits during establishment of woody perennials

2017

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Background and aims Vegetation stabilizes slopes via root mechanical reinforcement and hydrologic reinforcement induced by transpiration. Most studies have focused on mechanical reinforcement and its correlation with plant biomechanical traits. The correlations however generally ignore the effects of hydrologic reinforcement. This study aims to quantify the hydrologic reinforcement associated with ten woody species and identify correlations with relevant plant traits. Methods Ten species widespread in Europe, which belong to Aquifoliaceae, Betulaceae, Buxaceae, Celastraceae, Fabaceae, Oleaceae and Salicaceae families, were planted in pots of sandy loam soil. Each planted pot was irrigated and then left to transpire. Soil strength, matric suction and plant traits were measured. Results Transpiration-induced suction was linearly correlated with soil penetration resistance for the ten species due to their different transpiration rates i.e. both suction and soil penetration resistance induced by Hazel and Blackthorn (deciduous) were five times greater than those by Holly and European Box (evergreens). Specific leaf area and root length density correlated with hydrologic reinforcement. The root:shoot ratio correlated best with the hydrologic reinforcement. Conclusions Specific leaf area, root length density and root:shoot ratio explained the tenfold differences in hydrologic reinforcement provided by the ten different species.

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Root induced changes of effective 1D hydraulic properties in a soil column

Cited by 108 publications

References 90 publications

Plant age effects on soil infiltration rate during early plant establishment

Plant age effects on soil infiltration rate during early plant establishment

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

Correlating hydrologic reinforcement of vegetated soil with plant traits during establishment of woody perennials

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