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Author: search.filters.author.Sakolpanya, TapakornHas files: No

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    Dynamic changes in cellulose content and biomechanical properties of mycorrhizal roots during growth and decay
    (2023-09-01)
    Kamchoom, Viroon
    ;
    Chen, Xun Wen
    ;
    Leung, Anthony Kwan
    ;
    Sakolpanya, Tapakorn
    ;
    Srinil, Chortham
    Aims: Arbuscular mycorrhizal (AM) fungi have been found to increase plant biomass, cellulose content, and the associated root biomechanical properties, but little is known about how AM fungi affect the in situ root decay process in terms of the changes in the chemical and biomechanical properties. Methods: In this study, we inoculated AM fungi to Bermuda grass (Cynodon dactylon L.) and measured the biomass, the contents of cellulose and lignin, and the biomechanical properties, including tensile strength and Young’s modulus of the grass roots as they grew for 180 days and then decayed for 360 days after burning or for 60 days after the herbicide application. Results: Results show that the AM fungi accelerated the accumulation of grass biomass and root cellulose content compared with non-mycorrhizal grass during the growth period. This effect of AM fungi made mycorrhizal grass generally maintained more biomass and cellulose content than non-mycorrhizal grass at every decaying stage. Inoculation of the AM fungi did not significantly change the root tensile strength or Young’s modulus, but it altered the correlations between tensile strength and root diameter, and Young’s modulus and root diameter. Mycorrhizal effects during the root decaying process appeared to diminish under herbicide treatment, compared with normal growth and burning treatments. Conclusion: Our study highlights the important role of AM fungi in maintaining in situ root biomass (a proxy for carbon content) from decaying or decomposing.
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    Shearing behaviour of vegetated soils with growing and decaying roots
    (2022-12-01)
    Kamchoom, Viroon
    ;
    Leung, Anthony Kwan
    ;
    Boldrin, David
    ;
    Sakolpanya, Tapakorn
    ;
    Wu, Zhaoyi
    Plant roots affect the soil shear strength, but the temporal dynamics of roots such as growth and decay due to different mortality means have rarely been considered. This study investigates the effects of root growth and decay on the changes in root biomechanical properties and the shearing behaviour of vegetated soils. Columns of compacted soils were grown with a grass species, Cynodon dactylon. The grass was grown for 6 months, followed by burning or herbicide applications to introduce root decay. The top part of each column was used for direct shear tests, whilst the roots collected from the bottom part were used for the measurements of root tensile and chemical properties. The vegetated soils displayed greater shear strength and larger dilatancy, which were attributable to the growth-induced increase in the root cellulose content, and thus the root tensile strength and modulus. Root decay, upon burning or herbicide use, caused significant declines in the root tensile properties, which translated to the reductions in soil dilatancy and soil shear strength lower than those of the fallow soil. Herbicide use introduced a much faster and significant loss of root reinforcement than burning because of the more severe decay and loss of root biomechanical properties.