Chin J Plant Ecol ›› 2019, Vol. 43 ›› Issue (8): 709-717.DOI: 10.17521/cjpe.2019.0112

• Research Articles • Previous Articles     Next Articles

Effect of microstructure in cross section on tensile properties of Indigofera amblyantha

ZHANG Qiao-Yan1,TANG Li-Xia1,*(),LIAO Hua-Gang2,PAN Lu1,CHEN Long1,HUANG Tong-Li1   

  1. 1College of Forestry, Guizhou University, Guiyang 550025, China
    2Qiandongnanzhou Institution of Forestry Science, Kaili, Guizhou 556000, China
  • Received:2019-05-14 Revised:2019-08-14 Online:2019-08-20 Published:2020-01-03
  • Contact: TANG Li-Xia
  • Supported by:
    Science and Technology Plan Project of Guizhou Province([2016]2612号)

Abstract:

Aims The microstructure of root in cross section is composed of connected skeleton and interconnected or closed holes, which is closely related to the tensile mechanical properties of root system.
Methods The relationship of the microstructure of root in cross section and the tensile performances of root, in this study, was discussed by means of single root drawing test and scanning electron microscope (SEM).
Important findings The main results showed that: 1) the ability of root in cross section to bear tension and tensile strain decreased with the increase of root diameter in per unit area; 2) the tensile strength and ductile behaviors of root decreased with the increase of average pore size, and the uniformity of pore size also had a certain influence on them; with the increase of root diameter, the arrangement mode of vessels presents: single vessel → multiple vessel → chain of vessel → cluster of vessel. The arrangement mode of vessel and the uniformity of distribution have influences on the tensile strength characteristics of root, the influence of the arrangement mode has a greater influence than the uniformity distribution; 4) the influence of area ratio of root in cross section on root tensile properties, is also influenced by xylem, root bark and vessel characteristics. In conclusion, this study revealed that the increase of root diameter influenced the microstructure in cross section and affected the tensile properties of roots from the perspective of root microstructure, which provided a certain theoretical basis to further analysis of the soil fixation mechanism of shrub root systems.

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Key words: vessel, mechanical properties, root, microstructure