Mechanical Properties of the Rhizome of Arundo donax L.

Abstract

The mechanical properties of rhizome segments of Arundo donax L. were studied in three dimensions: longitudinal (X), transverse-vertical (Y), transverse-horizontal (Z). Tensile, cyclic loading and torsional tests demonstrate that the distinct anisotropy found in the hollow stems is less pronounced in the rhizome. Morphological and anatomical examinations suggest that the mechanical anisotropy of the stem is caused by the arrangement parallel to the stem of the vascular bundles and sclerenchymatous fibres, embedded in lignified parenchyma. Anatomical inhomogeneity is less pronounced in the rhizome due to the short internode lengths, and predominance of nodal regions, where sclerenchymatous fibres form a complex three-dimensional arrangement embedded in unlignified starch-storing parenchyma. Cyclic loading experiments indicate viscoelastic behaviour of the rhizomatous tissues under tensile stress. Additionally, viscoelastic behaviour under torsional stress was studied. Mechanical behaviour of the rhizome under tension up to fracture is discussed with regard to the fracture surfaces, analysed by SEM.

Key words

Arundo donax - biomechanics - fracture surfaces - mechanical properties - rhizome - SEM.

References

• 1 Beismann H., Wilhelmi H., Baillères H., Spatz Ch., Bogenrieder A., Speck T.. Brittleness of twig bases in the genus Salix: fracture mechanics and ecological relevance.  Journal of Experimental Botany. (2000);  51 617-633
• 2 Bell A. D.. Plant Form, An Illustrated Guide to Flowering Plant Morphology. Oxford, New York, Tokyo; Oxford University Press (1991): 341
• 3 Bodig J., Jayne B. A.. Mechanics of Wood and Wood Composites. Malabar; Krieger Publishing Company (1993): 712
• 4 Bowes B. G.. A Colour Atlas of Plant Structure. London; Manson Publishing (1996): 192
• 5 Crook M. J., Ennos A. R., Sellers E. K.. Structural development of the shoot and root systems of two winter wheat cultivars, Triticum aestivum L.  Journal of Experimental Botany. (1994);  45 857-863
• 6 Ennos A. R.. The mechanics of root anchorage.  Advances in Botanical research. (2000);  33 133-157
• 7 Ennos A. R., Crook M. J., Grimshaw C.. A comparative study of anchorage systems of Himalayan balsam Impatiens glandulifera and mature sunflower Helianthis annuus. .  Journal of Experimental Botany. (1993 a);  44 133-146
• 8 Ennos A. R., Crook M. J., Grimshaw C.. The anchorage mechanics of maize Zea mays. .  Journal of Experimental Botany. (1993 b);  44 147-153
• 9 Goodman A. M., Crook M. J., Ennos A. R.. Anchorage mechanics of the tap root system of winter-sown oilseed rape (Brassica napus L.).  Annals of Botany. (2001);  87 397-404
• 10 Karrenberg S., Blaser J., Kollmann J., Edwards P. J.. Root anchorage of saplings and cuttings of woody pioneer species in a riparian environment.  Functional Ecology. (2003);  17 170-177
• 11 Kerzenmacher T., Gardiner B.. A mathematical model to describe the dynamic response of a spruce tree to the wind.  Trees. (1998);  12 385-394
• 12 Köhler L., Speck T., Spatz Ch.. Micromechanics and anatomical changes during early ontogeny of two lianescent Aristolochia species.  Planta. (2000);  210 691-700
• 13 Mattheck C.. Design in der Natur. Der Baum als Lehrmeister. Freiburg; Rombach (1992 a): 242
• 14 Mattheck C.. Die Baumgestalt als Autobiographie. Braunschweig; Bernhard Thalacker (1992 b): 144
• 15 Mickovski S. B., Ennos A. R.. A morphological and mechanical study of the root systems of suppressed crown Scots pine Pinus sylvestris. .  Trees. (2002);  16 274-280
• 16 Neinhuis C., Edelmann H.. Methanol as a rapid fixative for the investigation of plant surfaces by SEM.  Journal of Microscopy. (1996);  184 14-16
• 17 Niklas K. J.. Plant Biomechanics. An Engineering Approach to Plant Form and Function. Chicago; The University of Chicago Press (1992): 607
• 18 Spatz Ch., Beismann H., Brüchert F., Emanns A., Speck T.. Biomechanics of the giant reed Arundo donax. .  Philosophical Transactions of the Royal Society of London Series B Biological Sciences B. (1997);  352 1-10
• 19 Spatz Ch., Beismann H., Emanns A., Speck T.. Mechanical anisotropy and inhomogeneity in the tissues comprising the hollow stem of the giant reed Arundo donax. .  Biomimetics. (1995);  3 141-155
• 20 Spatz Ch., Köhler L., Niklas K. J.. Mechanical behaviour of plant tissues: composite materials or structures?.  Journal of Experimental Biology. (1999);  202 3269-3272
• 21 Speck O.. Field measurements of wind speed and reconfiguration in Arundo donax with estimates of drag forces.  American Journal of Botany. (2003);  90 1253-1256
• 22 Speck O., Speck T., Spatz Ch.. Viskoelastizität und Plastizität - oder wie vermeiden Pflanzen destruktive Oszillationen? - Eine biomechanisch-funktionsanatomische Analyse des Rhizoms von Arundo donax. . Nachtigall W. and Wisser A., eds. BIONA-Report 12 - Technische Biologie und Bionik 4, Mainz. Stuttgart, Jena, New York; Gustav Fischer Verlag (1998): 91-106
• 23 Speck O., Speck T., Spatz Ch.. Arundo donax as a damped harmonic oscillator. Nachtigall, W., and Wisser, A., eds. BIONA-Report 14 - Technische Biologie und Bionik 4, Mainz. Stuttgart, Jena, New York; Gustav Fischer Verlag (2000): 143-147
• 24 Stokes A.. Biomechanics of tree root anchorage. Waisel, Y., Eshel, A., and Kafkafi, U., eds. Plant Roots - The Hidden Half. New York; Marcel Dekker (2002): 175-186
• 25 Vincent  V J. F.. Structural Biomaterials. 2nd edn. Princeton; Princeton University Press (1990): 244
• 26 Walters S. M., Brady A., Brickell C. D., Cullen J., Green P. S., Lewis J., Matthews V. A., Webb D. A., Yeo P. F., Alexander J. C. M.. The European Garden Flora, Vol. II (II). Monocotyledons. Cambridge, London, New York, New Rochelle, Melbourne, Sydney; Cambridge University Press (1984): 318

Section Editor: L. A. C. J. Voesenek