Biomechanical properties of the growing and decaying roots of Cynodon dactylon

Kamchoom, Viroon; Boldrin, David; Leung, Anthony Kwan; Sookkrajang, Chanakan; Likitlersuang, Suched

doi:10.1007/s11104-021-05207-1

Cited by 22 publications

(20 citation statements)

References 51 publications

(10 reference statements)

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“…While the cause of root mortality in our study was by herbicide application, root decomposition in most of the literature on woody species was introduced by timber harvesting or wildfires. In addition, Kamchoom et al (2021) demonstrated that the tensile strength of decomposed roots due to herbicide application declined at a rate that was faster than those of roots decomposed by burning.…”

Section: Biomechanical Properties Of Decomposing Rootsmentioning

confidence: 99%

“…The decline of root breakage strain (or increased brittleness) was also reported for the roots of S. setchuensis studied by Zhu et al (2020), which may be again explained by the changes in both the cellulose and lignin contents. Indeed, Kamchoom et al (2021) reported that both lignin and cellulose of the Cynodon dactylon (bermuda grass), which govern the root biomechanical properties, significantly reduced following root decomposition after herbicide application. Recently, the root breakage strain, which indicates the root brittleness, is recognised to play an important role in pre-failure kinematics and mobility of vegetated soils (Wu et al, 2021).…”

Section: Biomechanical Properties Of Decomposing Rootsmentioning

confidence: 99%

“…Despite of a large volume of studies available in the literature, data on the deterioration of root biomechanical properties and root reinforcement to soil are scarce, especially for herbaceous species which share rather different root anatomy and growth mechanism from woody species that has been majorly focused in the literature. More recently, Kamchoom et al (2021) reported the tensile strength of C. dactylon reduced by 30% (from 24.64 ± 1.99 MPa to 17.27 ± 1.83 MPa) and 40% (from 24.64 ± 1.99 MPa to 14.87 ± 1.32 MPa) after 360 days of burning and 60 days of herbicide application, respectively. However, the change in mechanical reinforcement, which underpins the vegetated slope stability, of vetiver roots due to herbicide application, has not been investigated.…”

mentioning

confidence: 99%

“…Such weed clearance techniques in agricultural practices including cutting, burning and herbicide application are mostly used to convert forest and natural ecosystems to agricultural land (Clements et al, 1996;Kamchoom et al, 2021;Kamchoom et al, 2022;Parish, 1990). However, due to the drawback of cutting (i.e., labour shortage) and burning (i.e., haze and smog from burning), herbicides have been widely used in Southeast Asian countries such as Thailand (Sapbamrer, 2018).…”

mentioning

confidence: 99%

“…For example, herbicides remain and contaminate soil, water, and air then damage surrounding ecosystems and human (Wongwichit et al, 2012). Moreover, plant death and the accompanying root decomposition caused by the herbicides would lead to the deterioration of the root biomechanical properties such as tensile strength that has implication to soil stability (Kamchoom et al, 2021). Indeed, plant has been used as a soil bioengineering means for effective and environmentally-friendly technique to prevent and mitigate shallow landslides (Kamchoom & Leung, 2018;Leknoi & Likitlersuang, 2020;Likitlersuang et al, 2017;Nguyen et al, 2020).…”

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confidence: 99%

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Reinforcement losses in soil stabilisation due to decomposing roots of Chrysopogon zizanioides and Chrysopogon nemoralis

et al. 2022

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Quantifying evolutions of the biomechanical properties and mechanical root reinforcement to soil with the duration of root decomposition is important to land management strategy and to soil stabilisation purposes. However, the variations of these properties of the roots of herbaceous species, especially following herbicide application in agriculture practices, have rarely been studied. This study aims to measure the effects of root decomposition due to herbicide on the root biomechanical properties and root reinforcement provided by two contrasting vetiver species (Chrysopogon nemoralis and Chrysopogon zizanioides). We applied herbicide (i.e., propanil) to four treatments of each species, considering four different durations of decomposition (7-, 28-, 56-and 112-days since herbicide application). The biomechanical properties were measured by uniaxial tensile tests, whereas the root reinforcement to poorly graded sand (SP) was quantified by direct shear tests. Root decomposition significantly reduced mean root tensile strength, secant modulus and breakage strain of C. nemoralis and C. zizaniodes roots after 112 days since the herbicide application.Significant negative power correlations between root diameter and root strength (or root secant modulus) (R 2 = 0.39-0.86; p-value < 0.05) were identified. Root decomposition did not change the shape of these correlations, but they shifted downwards as roots decomposed. The root reinforcement also declined with the decomposition duration, in terms of root cohesion and maximum dilatancy within the study period. C. nemoralis displayed greater and quicker loss of both the root biomechanical properties and root reinforcement to soil than C. zizanioides.

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Section: Biomechanical Properties Of Decomposing Rootsmentioning

confidence: 99%

Section: Biomechanical Properties Of Decomposing Rootsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Reinforcement losses in soil stabilisation due to decomposing roots of Chrysopogon zizanioides and Chrysopogon nemoralis

et al. 2022

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Potentials of mycorrhizal fungi in altering eight biomechanical properties of plant roots

Chen,

Kamchoom,

et al. 2023

Land Degrad Dev

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Arbuscular mycorrhizal (AM) fungi are ubiquitous and impactful symbionts of most land plants and can regulate essential ecological processes. AM fungi can increase the cellulose content of root cell walls and hence the root tensile strength of grass. How AM fungi can alter other essential biomechanical properties is not clear. This study aims to study the contribution of AM fungi in altering biomechanical properties by comparing mycorrhizal and non‐mycorrhizal roots. We inoculated three fungal species to vetiver grass (Chrysopogon zizanioides) for comparison. Eight root biomechanical properties (i.e., yield strain, yield stress, break strain, tensile strength, Young's modulus, plastic modulus, plastic strain, and toughness) were determined for each root using a newly developed Fortran language‐based program. Inoculating AM fungi decreased both Young's modulus and plastic modulus by 23% and 17%, respectively, versus control, although it was species‐dependent. Yield stress was not significantly affected, but tensile strength was increased by 7%–17% upon fungal symbiosis. Together with the increases in break strain by 15%–20%, mycorrhizal roots possessed a notably higher toughness than non‐mycorrhizal roots by up to 36%. Greater root cohesion of mycorrhizal roots confirmed the enhanced (1.5‐fold) factor of safety in the soil‐root system. Our findings imply that AM fungi are of significant interest in plant biomechanics and geotechnical engineering. Applying AM fungi on soil slopes has considerable potential to improve vegetation and stability of green slopes.

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Geotechnical investigation and stability analysis of bio-engineered slope at Surat Thani Province in Southern Thailand

Ongpaporn

Jotisankasa

Likitlersuang

2022

Bull Eng Geol Environ

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Biomechanical properties of the growing and decaying roots of Cynodon dactylon

Cited by 22 publications

References 51 publications

Reinforcement losses in soil stabilisation due to decomposing roots of Chrysopogon zizanioides and Chrysopogon nemoralis

Reinforcement losses in soil stabilisation due to decomposing roots of Chrysopogon zizanioides and Chrysopogon nemoralis

Potentials of mycorrhizal fungi in altering eight biomechanical properties of plant roots

Geotechnical investigation and stability analysis of bio-engineered slope at Surat Thani Province in Southern Thailand

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